Iron

Iron — Material Page

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Iron (Fe, atomic number 26) is a silvery-gray Group 8 transition metal and the fourth most abundant element in Earth's crust (~5 wt%), the most abundant element by mass in the planet as a whole (making up ~32% of Earth's total mass concentrated in the core), and the dominant structural and functional metal of human civilization. Pure iron adopts a body-centered cubic (BCC) structure (α-Fe, ferrite) at room temperature, transforming to a face-centered cubic (FCC) structure (γ-Fe, austenite) above 912 °C and back to BCC (δ-Fe) above 1,394 °C before melting at 1,538 °C — a polymorphism that is the thermodynamic foundation of all steel heat treatment. Iron is ferromagnetic below its Curie temperature of 770 °C (the highest Curie temperature of any ferromagnet commonly used in magnets), with a saturation magnetization of 2.16 T — the highest of any element — making it the material of choice for transformer cores, electric motor laminations, and permanent magnet alloy matrices. ⁵⁶Fe, the most abundant iron isotope (91.75%), is the end product of stellar nucleosynthesis beyond which fusion reactions are energetically unfavorable — the "iron peak" of nuclear binding energy that defines the upper limit of exothermic stellar fusion.

Iron's central role in human technology derives overwhelmingly from its alloys — steel (Fe-C alloys with <2.1 wt% C) and cast iron (2.1–4 wt% C) — which together constitute approximately 95% of all metal produced globally, at roughly 1.9 billion tonnes per year. The extraordinary range of steel properties achievable through alloying (C, Mn, Cr, Ni, Mo, V, Si, Ti, Nb), thermomechanical processing (rolling, forging, extrusion), and heat treatment (quenching, tempering, annealing, case hardening) spans tensile strengths from ~200 MPa (soft annealed mild steel) to >2,000 MPa (ultra-high-strength maraging steels), hardnesses from 80 to 900 HV, and fracture toughnesses from <20 MPa·m½ (white cast iron) to >200 MPa·m½ (austenitic stainless steel). This processing versatility, combined with iron ore's geological abundance and well-developed extraction infrastructure (blast furnace ironmaking, basic oxygen steelmaking, electric arc furnace recycling), makes steel irreplaceable across construction, infrastructure, automotive, aerospace, and industrial machinery applications. Global steel production accounts for approximately 7–9% of total anthropogenic CO₂ emissions — decarbonization via hydrogen direct reduction (H-DRI) and electric arc furnace steelmaking is among the most critical and challenging industrial transitions of the coming decades.

High-purity iron — processed to eliminate carbon, sulfur, phosphorus, and other tramp elements that harden and embrittle — has distinct research and precision industrial roles where the intrinsic properties of the pure metal are required rather than the engineering properties of steel. Carbonyl iron powder (produced by thermal decomposition of Fe(CO)₅, achieving 99.5–99.9% purity with near-spherical particle morphology) is the standard material for soft magnetic composites, radiofrequency inductor cores, and magnetic shielding applications where eddy current losses must be minimized at high frequency. ARMCO® iron (a trade name for ultra-low-carbon ingot iron, ~99.6–99.85% Fe, <0.015% C) is the traditional standard for soft magnetic applications, magnetic shielding room construction (mu-metal precursor), and as a reference material for magnetic measurements. Ultra-high-purity iron (99.99–99.998%) grown by zone refining is used for fundamental studies of iron's electronic structure, magnetic properties, Mössbauer spectroscopy reference standards, and as a substrate for epitaxial thin-film research in spintronics and surface science.

General Properties

Property	Value	Notes
Atomic Number	26	Group 8, Period 4; transition metal; between manganese (25) and cobalt (27) — all three are ferromagnetic at room temperature; sits at the "iron peak" of nuclear binding energy (⁵⁶Fe has the highest binding energy per nucleon of any nuclide), the endpoint of exothermic stellar fusion
Atomic Mass	55.845 u	Four stable isotopes; ⁵⁶Fe dominates at 91.754%; ⁵⁷Fe (2.119%) is the Mössbauer nucleus — its 14.4 keV first-excited state is the basis of ⁵⁷Fe Mössbauer spectroscopy, the most powerful technique for characterizing iron oxidation states and local structure in minerals, steels, and proteins
Density (20 °C, α-Fe)	7.87 g/cm³	BCC α-Fe density at room temperature; austenite (γ-Fe, FCC) is slightly denser at ~8.0 g/cm³ — the density decrease on cooling through the austenite→ferrite transformation contributes to residual stresses in steel castings and welds; liquid iron is ~6.9 g/cm³, meaning solid iron sinks in its own melt
Melting Point	1,538 °C (1,811 K)	The highest melting point of the three common ferromagnetic metals (Fe, Co, Ni); above the melting point iron is paramagnetic; the precise melting point is significant for steelmaking process control — the blast furnace and BOF tap at ~1,580–1,650 °C (above liquidus with dissolved C and Si)
Boiling Point	2,862 °C (3,135 K)	Significant iron vapor pressure above ~1,800 °C; relevant to electric arc furnace operation (iron fume at arc temperatures ~3,500 °C), vacuum induction melting, and iron thin-film evaporation source design
Thermal Conductivity	80.4 W/m·K (25 °C, α-Fe)	Moderate for a metal; decreases with temperature (anomalous behavior near the Curie point 770 °C — the magnetic contribution to thermal conductivity disappears); alloying with C, Cr, Ni dramatically reduces conductivity (austenitic stainless steel: ~15 W/m·K)
Electrical Resistivity	96.1 nΩ·m (20 °C, α-Fe)	Moderate resistivity; shows anomalous increase near the Curie temperature (770 °C) due to spin-disorder scattering; the resistivity of γ-Fe (austenite) above 912 °C is ~125 nΩ·m; alloying greatly increases resistivity — silicon steel for transformer cores (~450 nΩ·m) reduces eddy current losses at power frequencies
Crystal Structure	BCC (α-Fe, <912 °C); FCC (γ-Fe, 912–1,394 °C); BCC (δ-Fe, 1,394–1,538 °C)	The α→γ transformation at 912 °C (A3 temperature) is the basis of all steel austenitizing heat treatments; γ→α on cooling drives martensite formation (diffusionless shear transformation) in quenched steels — the hardening mechanism of through-hardened tool steels, bearing steels, and carburized gears; the FCC austenite phase has higher carbon solubility (up to 2.14 wt% at 1,147 °C vs. <0.02 wt% in BCC ferrite), explaining why steels must be austenitized before quenching to achieve full martensite

Mechanical Properties (Pure α-Fe)

Property	Value	Notes
Hardness	Mohs ~4; ~70–80 HV (annealed pure Fe)	Pure iron is soft and ductile in the annealed condition; hardness increases dramatically with carbon content (0.8% C pearlite: ~200 HV; martensite: 700–900 HV) and cold work; Vickers hardness is the more useful engineering measure for steels — Mohs scale is rarely used for metals in practice
Elastic (Young's) Modulus	211 GPa	One of the highest moduli of any common structural metal; slightly direction-dependent (anisotropic BCC crystal: 125–272 GPa along different crystallographic directions); the modulus of steel is essentially the same as pure iron — alloying elements at typical concentrations do not significantly change the modulus, making steel stiffness design independent of alloy grade
Poisson's Ratio	0.29	Consistent across most iron and steel compositions; used in structural finite element analysis of steel members and components
Tensile Strength	~210 MPa UTS (annealed, high-purity); up to >2,000 MPa in alloy steels	Pure iron is relatively weak; strength increases with carbon, alloying, and work hardening by factors of 5–10×; advanced high-strength steels (AHSS) for automotive body-in-white achieve 980–1,500 MPa tensile strength; maraging steels reach 2,400 MPa; piano wire (cold-drawn pearlitic steel) exceeds 3,000 MPa

Magnetic & Thermal Properties

Property	Value	Notes
Curie Temperature	770 °C (1,043 K)	Above 770 °C, α-Fe is paramagnetic (no spontaneous magnetization); the Curie temperature is lower than cobalt (1,115 °C) and nickel (358 °C) — iron loses its ferromagnetism before it transforms to austenite at 912 °C; silicon steel transformer cores operating near 770 °C (never intended) would lose their magnetic properties
Saturation Magnetization	2.16 T (at 20 °C)	Highest saturation magnetization of any element or common alloy; the basis of iron's use in high-flux transformer cores and motor laminations; silicon additions (2–4 wt% Si) reduce saturation marginally (~2.0 T) but dramatically increase electrical resistivity, reducing eddy current losses — the trade-off driving silicon steel design
Coefficient of Thermal Expansion	11.8 µm/m·°C (α-Fe, 20–100 °C)	Moderate CTE — similar to most steels (10–13 µm/m·°C); Invar alloy (Fe-36Ni) has a CTE of ~1.2 µm/m·°C near room temperature due to magnetostrictive compensation, exploited in precision instruments, geodetic tapes, and LNG tank containment; the γ→α CTE mismatch (~13 vs. ~11 µm/m·°C) contributes to residual stress in heat-treated steel components

Chemical Properties

Property	Value / Behavior	Notes
Corrosion (Rusting)	Forms non-protective Fe₂O₃·xH₂O (rust) in moist air	Unlike aluminum or chromium, iron's rust layer is porous and non-adherent — it does not passivate but continues to spall and allow further oxidation; rust causes an estimated $2.5 trillion in economic damage annually worldwide; protective strategies include galvanizing (Zn coating), chromium alloying (>10.5% Cr for stainless steel passivation), organic coatings, and cathodic protection
Surface Oxides	FeO (wüstite, Fe²⁺); Fe₂O₃ (hematite, Fe³⁺); Fe₃O₄ (magnetite, Fe²⁺/Fe³⁺)	The three common iron oxides have distinct magnetic and electronic properties: magnetite (Fe₃O₄) is ferrimagnetic and the oldest known magnetic material (lodestone); hematite (Fe₂O₃) is the primary iron ore and a red pigment; wüstite (FeO) is the high-temperature scale on hot-rolled steel, removed by acid pickling before cold rolling; iron oxide nanoparticles (Fe₃O₄, γ-Fe₂O₃) are used as MRI contrast agents and in magnetic hyperthermia cancer therapy
Oxidation States	+2 (Fe²⁺, ferrous); +3 (Fe³⁺, ferric); +6 (ferrate, Fe²VI, strong oxidizer)	Fe²⁺/Fe³⁺ redox couple (E° = +0.77 V vs. SHE) is biologically critical — hemoglobin carries O₂ via reversible Fe²⁺/O₂ coordination in the porphyrin ring; Fe²⁺/Fe³⁺ cycling in Fenton chemistry generates hydroxyl radicals used in wastewater treatment; ferrate (FeO₄²⁻) is an emerging "green" water treatment oxidant and disinfectant
Catalytic Activity	Haber-Bosch (N₂ fixation), Fischer-Tropsch, water-gas shift	Promoted iron catalysts (Fe with K₂O and Al₂O₃ promoters) are the standard Haber-Bosch ammonia synthesis catalyst (400–500 °C, 150–300 bar) — arguably the most economically important catalytic process in history, enabling nitrogen fertilizer production for ~50% of the global food supply; iron-based Fischer-Tropsch catalysts convert syngas to olefins and fuels at 300–350 °C (high-temperature FT, Sasol CTL/GTL processes)

Identifier	Value
Symbol	Fe
Atomic Number	26
CAS Number	7439-89-6
UN Number	UN3089 (powder, reduced)
EINECS Number	231-096-4

Isotope	Type	Notes
⁵⁴Fe	Stable	5.845% natural abundance; I = 0; the lightest stable iron isotope; produced primarily by silicon burning in massive stars; used as enriched IDMS spike for high-precision iron quantification in geological and biological samples by MC-ICP-MS; ⁵⁴Fe(p,n)⁵⁴Co reaction used in accelerator-based activation analysis
⁵⁶Fe	Stable	91.754% natural abundance; I = 0; most abundant iron isotope by far; ⁵⁶Fe has one of the highest nuclear binding energies per nucleon of any nuclide (~8.79 MeV/nucleon), making it the thermodynamic endpoint of exothermic stellar fusion — stars cannot extract net energy by fusing ⁵⁶Fe, defining the "iron catastrophe" that triggers core collapse in massive stars; δ⁵⁶Fe isotope fractionation (MC-ICP-MS) is used to trace iron cycling in ocean chemistry and biological systems
⁵⁷Fe	Stable	2.119% natural abundance; I = 1/2, Mössbauer-active; the first excited state at 14.413 keV (t½ = 97.7 ns) is the gamma-ray transition used in ⁵⁷Fe Mössbauer spectroscopy — the most sensitive technique for measuring iron oxidation state (+2/+3/+4/+6), spin state (high/low spin), coordination geometry, and hyperfine magnetic field in minerals, glasses, proteins (hemoglobin, ferritin, iron-sulfur clusters), corrosion products, steels, and meteorites; ⁵⁷Co sources (t½ = 271.8 days) provide the Mössbauer gamma radiation via decay to ⁵⁷Fe*
⁵⁸Fe	Stable	0.282% natural abundance; I = 0; rarest stable iron isotope; used as enriched IDMS spike for iron isotope ratio measurements; ⁵⁸Fe is a candidate for neutrinoless double beta decay studies (theoretical Q-value 1.655 MeV), though current experimental limits are many orders of magnitude below required sensitivity
⁵⁵Fe	Radioactive	t½ = 2.73 yr (electron capture); no gamma emission — pure electron capture emitting Mn X-rays at 5.9 keV; produced by neutron activation of ⁵⁴Fe in nuclear reactors and by cosmic ray spallation; used as a low-energy X-ray calibration source for silicon X-ray detectors (5.9 keV Mn-Kα line); environmentally significant as an activated corrosion product in nuclear reactor primary circuits; measured in nuclear plant liquid effluent monitoring
⁵⁹Fe	Radioactive	t½ = 44.5 days (β⁻); emits 1.099 and 1.292 MeV gamma rays; produced by neutron activation of ⁵⁸Fe; the standard radiotracer for iron metabolism and absorption studies in human nutrition research (oral ⁵⁹Fe citrate dose followed by whole-body counting or blood sampling); used in red blood cell survival studies and iron kinetics in anemia research; also used as an industrial gamma radiography source and activated corrosion product tracer in nuclear systems

Scientific & Research Applications

Use Case	Form Typically Used	Description
Mössbauer Spectroscopy Standards	α-Fe foil (25 µm, 99.99%+ purity) as velocity calibrant and reference absorber	High-purity α-Fe foil is the universal velocity calibration standard for ⁵⁷Fe Mössbauer spectroscopy — the six-line hyperfine pattern of α-Fe (isomer shift 0.00 mm/s, hyperfine field 33.0 T) provides precise velocity calibration across the ±10 mm/s velocity range. α-Fe absorber foil is also used as a reference absorber for measuring isomer shift relative to the α-Fe standard, which is the convention in nearly all published Mössbauer spectra. Used in characterization of iron minerals, meteorites, steels, corrosion products, and iron-containing biomolecules.
Haber-Bosch Catalyst Research	Fused iron catalyst (Fe₃O₄ with K₂O/Al₂O₃/CaO promoters), iron nanoparticles	The industrial ammonia synthesis catalyst (fused iron, promoted with K₂O and Al₂O₃) has been in continuous use since 1913 with incremental improvements; research focuses on understanding N₂ dissociation mechanisms on Fe surface facets, the role of potassium in lowering activation energy, nano-structured iron catalysts for lower-pressure synthesis, and ruthenium-based alternatives for green ammonia production at lower temperatures compatible with intermittent renewable electricity.
Spintronics & Magnetic Thin Films	Fe thin films (MBE, sputtering), Fe/Cr, Fe/MgO multilayers	Iron thin films on MgO(001) substrates are canonical systems for spintronics research — Fe/MgO/Fe magnetic tunnel junctions achieve tunneling magnetoresistance (TMR) ratios of >600% at room temperature due to symmetry-filtered tunneling through the MgO barrier. Fe/Cr multilayers were the original GMR system (Fert and Grünberg, Nobel 2007). Body-centered cubic Fe is the standard reference for ab initio calculations of magnetic exchange interactions, spin waves, and magnetocrystalline anisotropy.
Iron Isotope Geochemistry	Enriched ⁵⁴Fe, ⁵⁷Fe, ⁵⁸Fe spikes; IRMM-014 reference standard	Iron isotope ratios (δ⁵⁶Fe, δ⁵⁷Fe vs. IRMM-014) measured by MC-ICP-MS at ±0.02‰ precision trace iron cycling in ocean biogeochemistry (phytoplankton uptake, hydrothermal vent iron flux), weathering of continental crust, magmatic differentiation, and ore-forming processes. ⁵⁷Fe-labeled tracers are used in human nutrition studies of dietary iron absorption; ⁵⁵Fe measurements (low-energy X-ray counting) track reactor corrosion product mobilization in nuclear plant coolant chemistry.
Magnetism & Phase Transition Research	High-purity Fe single crystals (zone-refined), Fe whiskers	High-purity iron single crystals and whiskers are used for fundamental studies of ferromagnetism — Barkhausen noise, magnetic domain structure by Kerr microscopy and neutron diffraction, magnetostriction coefficients, and the Curie transition at 770 °C. Zone-refined iron (99.99%+) eliminates interstitial C, N, and O that pin domain walls and alter the soft magnetic response, enabling measurement of intrinsic iron magnetic properties free from defect scattering contributions.
Iron Nanoparticle & MRI Contrast Research	Fe₃O₄ and γ-Fe₂O₃ nanoparticles (superparamagnetic, 5–20 nm)	Superparamagnetic iron oxide nanoparticles (SPIONs, Fe₃O₄ or γ-Fe₂O₃, 5–20 nm, surface-functionalized with dextran, PEG, or silica) are negative (T2) MRI contrast agents used clinically for liver tumor detection (Resovist, Feridex) and in research for lymph node mapping, cancer cell labeling, and image-guided drug delivery. SPIONs absorb RF energy and generate localized heat in alternating magnetic fields — magnetic hyperthermia is under clinical investigation for glioblastoma treatment.

Industrial & Commercial Applications

Sector	Form / Grade Used	Description
Steel Manufacturing	Hot metal (blast furnace iron, ~4% C); DRI (direct reduced iron, >90% Fe)	Iron is the primary raw material for all steel production — approximately 1.9 billion tonnes of crude steel are produced annually, of which ~70% is from the BF-BOF (blast furnace/basic oxygen furnace) route using coal-reduced pig iron, and ~30% from EAF (electric arc furnace) recycling of scrap. Steel alloy grades span from ultra-low-carbon drawing steel (IF steel, <50 ppm C) for deep-drawn automotive panels to high-carbon rails, bearing steels, tool steels, stainless steels, and heat-resistant alloys — all built on the iron matrix.
Electrical Steel (Transformer & Motor Laminations)	Silicon steel (Fe-Si 2–4 wt%), grain-oriented (GO) and non-oriented (NO)	Silicon steel (Fe-2–4 wt% Si) with controlled grain orientation is the dominant material for transformer cores and electric motor stator/rotor laminations — consuming ~10 million tonnes/year globally. Silicon increases electrical resistivity (reducing eddy current losses) and reduces magnetostriction (reducing acoustic noise). Grain-oriented electrical steel (GOES, Goss texture, Fe-3.2 wt% Si) achieves core losses of <0.8 W/kg at 1.7 T, 50 Hz in high-efficiency distribution transformers. The global expansion of EV traction motors is driving demand for thin non-oriented electrical steel (<0.35 mm) with reduced core losses at high frequencies (400–1,000 Hz).
Powder Metallurgy Components	Carbonyl iron powder (99.5–99.9%), atomized iron powder	Iron powder is compacted and sintered to produce net-shape or near-net-shape components (gears, bearings, structural parts, soft magnetic composites) by powder metallurgy — consuming ~1.5 million tonnes of iron powder annually. Carbonyl iron powder (from Fe(CO)₅ decomposition, 5–10 µm spherical particles) is used for RF inductor cores, magnetic shielding composites, and microwave absorbing materials where the particle morphology and high purity minimize eddy current and hysteresis losses at high frequency. Atomized water or gas-atomized iron powder (20–200 µm) is the bulk sintered parts feedstock.
Magnetic Shielding	ARMCO® iron, mu-metal (Ni-Fe), cold-rolled silicon steel sheet	High-purity iron (ARMCO® grade) and permalloy-family alloys provide passive magnetic shielding of sensitive instruments — MRI scanner rooms, magnetoencephalography (MEG) labs, atomic magnetometer enclosures, and electron microscope columns. The shielding effectiveness depends on relative magnetic permeability (µᵣ), which is maximized in ultra-low-carbon, annealed iron and Ni-Fe alloys by minimizing domain wall pinning sites. Multilayer enclosures alternating µ-metal (inner) with silicon steel (outer) achieve attenuation of Earth's field by factors of 10,000–100,000.
Iron Oxide Pigments & Abrasives	Synthetic Fe₂O₃ (red, yellow, black), Fe₃O₄ powder	Synthetic iron oxide pigments — red (α-Fe₂O₃), yellow (FeOOH goethite), black (Fe₃O₄) — are the most widely used inorganic color pigments globally, consumed at >1 million tonnes/year in paints, coatings, concrete colorants, cosmetics, and plastics. They are non-toxic, lightfast, alkali-resistant, and low-cost. Iron oxide polishing compounds (rouge, Fe₂O₃, sub-micron particle size) are used for optical glass polishing and gemstone finishing.
Ammonia Synthesis (Haber-Bosch)	Fused iron catalyst (Fe₃O₄ + K₂O + Al₂O₃ + CaO promoters)	The Haber-Bosch process for ammonia synthesis (N₂ + 3H₂ → 2NH₃, fused iron catalyst, 400–500 °C, 150–300 bar) produces ~185 million tonnes of NH₃/year — the nitrogen fertilizer feedstock that supports approximately half of global food production. The promoted iron catalyst (fused magnetite, reduced to α-Fe in situ, promoted with K₂O for activity and Al₂O₃/CaO for structural stability) has been in continuous industrial use since 1913 and remains the dominant catalyst despite decades of research into alternatives.

Iron is available across a broad purity range reflecting its diverse uses from bulk metallurgy to precision magnetic and research applications. Named grades (ARMCO®, Soft Ingot) denote specific product forms and processing histories in addition to purity.

Grade / Designation	Purity	Main Use
Fe 98% (1N8)	98%	General industrial metallurgy and powder applications — sintered structural parts, iron powder compacts, and bulk alloying additions where sub-2% impurities (primarily C, Mn, Si) are acceptable
Fe 99% (2N)	99%	Coatings, thermal spraying, and basic research — thermal sprayed iron coatings for wear and corrosion protection and general laboratory synthesis applications
Fe 99.5% (2N5)	99.5%	Magnet manufacturing and polishing materials — carbonyl iron powder for soft magnetic composites and RF inductor cores; iron oxide polishing rouge precursor
Fe 99.6% (2N6)	99.6%	Magnetic core fabrication — soft magnetic iron for DC electromagnet poles, relay cores, and transformer cores in low-frequency applications
ARMCO® Soft Ingot (2N6)	99.6%	Vacuum-degassed ingot iron for magnetic shielding and precision magnetics — ultra-low carbon (<0.015% C) produced by vacuum degassing; the traditional industry reference for soft magnetic iron; used in magnetic shielding room construction and as a reference material for permeability measurements
Fe 99.8% (2N8)	99.8%	High-purity research and sputtering targets — PVD sputtering targets for iron thin-film deposition in spintronics research (Fe/MgO tunnel junctions, Fe/Cr GMR multilayers) and fundamental iron surface science studies
Soft Ingot (2N8)	99.8%	Precision instruments, electronics, and core laminations — high-purity ingot iron for precision electromagnet pole pieces, Mössbauer reference absorber foil production, and mu-metal annealing mandrels
Fe 99.85% (2N85)	99.85%	High-strength alloy development and precision instruments — research into iron-based binary and ternary alloy systems where precise control of base iron composition is required
Fe 99.95% (3N5)	99.95%	Semiconductor and cryogenic applications — iron substrate material for epitaxial film growth; Mössbauer absorber foil; low-temperature physics studies of iron magnetic properties free from interstitial impurity effects
Fe 99.99% (4N)	99.99%	Ultra-high-purity applications in nanotechnology and quantum computing — zone-refined iron for fundamental magnetic property measurements, single-crystal growth for spintronics, and iron thin-film deposition for magnetic tunnel junction research
Fe 99.998% (4N8)	99.998%	Ultra-sensitive magnetic devices and scientific instrumentation — the highest-purity iron for intrinsic magnetic property measurements (saturation magnetization, magnetocrystalline anisotropy), Fe Mössbauer velocity calibration standards, and fundamental solid-state physics research

Synonym / Alternative Name	Context
Fe	Chemical symbol; from Latin ferrum, the root of all "ferro-" prefix terminology (ferrous, ferric, ferroelectric, ferromagnetic)
Iron metal	Standard commercial and regulatory designation for the elemental form; used in REACH/CLP filings, UN dangerous goods classification (UN3089 for iron powder), and supply chain documentation
Elemental iron	Scientific term distinguishing pure iron metal from iron compounds (Fe₂O₃, Fe₃O₄, FeCl₃, FeS₂, iron carbides, etc.) in chemistry and materials literature
Ferrous	Latin-derived adjective meaning "of or containing iron" — used broadly in "ferrous metal" (iron-based alloys) vs. "non-ferrous" (all other metals); also specifically denotes the Fe²⁺ oxidation state (ferrous ion, ferrous sulfate) vs. ferric (Fe³⁺)
ARMCO® iron	Trade name for ultra-low-carbon ingot iron produced by vacuum degassing or open-hearth refining (<0.015% C, <0.01% Mn, <0.005% S, <0.005% P); originally developed by the American Rolling Mill Company (ARMCO); the industry standard for soft magnetic applications and the reference material for many magnetic permeability specifications; now produced by multiple manufacturers under various trade names
Carbonyl iron	Iron produced by thermal decomposition of iron pentacarbonyl (Fe(CO)₅): Fe(CO)₅ → Fe + 5CO; produces ~5 µm near-spherical high-purity (99.5–99.9%) powder with very low carbon content; the standard material for RF inductor cores, soft magnetic composites, and microwave absorbers; distinguished from atomized iron powder by its particle morphology and purity
Ferrum	Latin name for iron; origin of the chemical symbol Fe; used in formal IUPAC nomenclature of iron compounds and as the root of all "ferro-" and "ferri-" chemical prefixes

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