Erbium

Erbium — Material Page

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Erbium (Er, atomic number 68) is a heavy lanthanide with an HCP crystal structure, melting point of 1,529 °C, and the defining optical property that makes it the single most commercially important rare-earth element for photonics: Er³⁺ has a sharp ⁴I₁₃/₂ → ⁴I₁₅/₂ electronic transition at 1,530 nm — which coincides precisely with the minimum-loss transmission window (~0.2 dB/km) of standard silica single-mode optical fiber. This coincidence is not exploited in a minor way: the entire global telecommunications infrastructure for long-haul and submarine fiber-optic data transmission is enabled by erbium-doped fiber amplifiers (EDFAs), which amplify 1,530–1,565 nm (C-band) signals with high gain, low noise, and no optical-to-electronic conversion. Every transoceanic submarine cable (transatlantic, transpacific) contains EDFAs spaced at ~60–80 km intervals; virtually all internet data crosses continental and oceanic distances through EDFA-amplified DWDM (dense wavelength-division multiplexed) fiber links. Er is extracted from xenotime (YPO₄), monazite, and euxenite ores, primarily in China; global production is ~500–600 tonnes/year.

The Er:YAG laser (2,940 nm emission, from the ⁴I₁₁/₂ → ⁴I₁₃/₂ transition) is the most strongly absorbed infrared laser wavelength by water (~12,000 cm⁻¹) — making it the dominant laser for dental hard tissue ablation and for precision medical/surgical procedures where shallow, controlled ablation depth with minimal thermal damage is required. Er:YAG (2.94 µm) and Er:YSGG (2.79 µm) lasers are used for caries removal and enamel preparation without anesthesia in dental practice, for skin resurfacing and scar revision (ablative fractional Er:YAG), and for arthroscopic cartilage and bone surgery. The "eye-safe" classification of 1,530–1,565 nm Er lasers (corneal absorption prevents retinal damage) makes Er³⁺-doped fiber lasers the preferred source for rangefinders, atmospheric LIDAR, and military target designation where eye safety is required.

Er³⁺ doping of silicon and silicon-based photonic devices is a key approach for integrating optical amplification with CMOS electronics — Er:Si and Er:Si₃N₄ waveguide amplifiers could enable on-chip optical interconnects operating at 1,530 nm, and Er-implanted silicon nanocavities and photonic crystal resonators are studied for quantum information applications using Er³⁺ as a long-coherence-time spin qubit. Er³⁺ in crystalline hosts (Er:Y₂SiO₅, Er:LiNbO₃) at cryogenic temperatures (4 K) has optical coherence times of milliseconds — among the longest of any solid-state qubit system — making it a strong candidate for optical quantum memory nodes in quantum networks. Er₃Fe₅O₁₂ (erbium iron garnet, ErIG) is studied for magnon-photon coupling and as a component in magnonic quantum transducers.

General Properties

Property	Value	Notes
Atomic Number	68	Heavy lanthanide, Period 6; 4f¹²6s²; only stable oxidation state +3 (Er³⁺, ⁴I₁₅/₂ ground state, J = 15/2). Er³⁺'s 4f¹² configuration gives 13 Kramers doublet levels below ~15,000 cm⁻¹, including the ⁴I₁₃/₂ metastable level (~6,500 cm⁻¹, radiative lifetime ~10 ms in silica fiber) responsible for 1,530 nm amplification. The Kramers doublet structure makes Er³⁺ a natural two-level system for quantum information at cryogenic temperatures.
Atomic Mass	167.259 u	Six naturally occurring stable isotopes: ¹⁶²Er (0.139%), ¹⁶⁴Er (1.601%), ¹⁶⁶Er (33.503%), ¹⁶⁷Er (22.869%, NMR-active, I = 7/2), ¹⁶⁸Er (26.978%), ¹⁷⁰Er (14.910%). ¹⁶⁶Er is the most abundant. ¹⁶⁷Er NMR (I = 7/2, large quadrupole moment, broad lines in low-symmetry environments) is used to study Er³⁺ site symmetry in optical host crystals and glasses relevant to EDFA performance.
Density (20 °C)	9.066 g/cm³	Moderate-high density for a heavy lanthanide — consistent with the lanthanide contraction trend. Relevant to fiber core composition calculations in Er-doped fiber preform design, where the Er concentration (~100–1,000 ppm by weight in the SiO₂-Al₂O₃-Er core) contributes negligibly to fiber density but must be tracked for absorption cross-section calculations.
Melting Point	1,529 °C (1,802 K)	Relatively high melting point for a heavy lanthanide. Processing requires vacuum arc melting or induction melting under Ar atmosphere. Er metal is used primarily as Er₂O₃ or ErCl₃ precursor for fiber preform doping (solution doping or MCVD impregnation) rather than as bulk metal in most applications.
Boiling Point	2,868 °C	High boiling point relative to melting point. Er₂O₃ sputtering targets are used for PVD deposition of Er-doped waveguide films (Er:Al₂O₃, Er:TiO₂, Er:Si₃N₄) for integrated photonic amplifiers and for Er-doped HfO₂ high-κ dielectric research.
Thermal Conductivity	14.5 W/m·K	Low thermal conductivity typical of heavy lanthanides. Relevant to thermal management of high-power Er:YAG and Er:YSGG laser crystals under high repetition-rate pulsed operation — Er:YAG crystals require efficient water-cooling to prevent thermal lensing and fracture at average powers above ~10 W.
Electrical Resistivity	85 nΩ·m (20 °C)	Moderate-high resistivity typical of heavy lanthanides. Er metal is not used for its electrical properties; resistivity data are relevant to Er thin-film contacts in rare-earth silicide (ErSi₂) Ohmic contact formation on n-type silicon for deep UV photodetectors and Er-silicide/silicon Schottky barrier devices.
Crystal Structure	HCP (α-Er), a = 3.559 Å, c = 5.585 Å (room temperature)	HCP structure stable at RT; transforms to BCC above ~1,322 °C. Er has complex magnetic ordering: cycloidal antiferromagnet below 52 K (Néel temperature), cone ferromagnet below 20 K. The magnetic structure of Er metal is studied as a model for helical spin density wave states and has been investigated for magnon-based quantum transducer applications in Er iron garnet (Er₃Fe₅O₁₂) films.

Mechanical Properties

Property	Value	Notes
Tensile Strength	~280 MPa (approximate)	Approximate value for annealed polycrystalline Er; measurement is limited by rapid surface oxidation during specimen preparation. Er is not used as a structural metal; mechanical data are relevant primarily to Er foil processing (sputtering targets, Er metal in nuclear shim applications) and to Er-containing Mg alloy grain boundary phase characterization.
Young's Modulus	70 GPa	Low-moderate modulus typical of heavy lanthanides. Relevant to Er:YAG laser crystal thermal stress modeling — the elastic modulus of the YAG host (~280 GPa) dominates, but Er substitution level affects local lattice strain and ultimately affects thermal lensing and wavefront distortion in high-power laser systems.
Hardness	~60–70 HB (annealed)	Moderate hardness for an annealed heavy lanthanide. Er can be machined under inert atmosphere and rolled into foil for sputtering targets and neutron flux monitor applications.
Elongation at Break	~20%	Good ductility in high-purity annealed form. Er can be rolled into foil and drawn into wire under inert atmosphere. High-purity Er foil (99.9%+) is used as sputtering targets for Er-doped waveguide deposition and as neutron flux monitor foils in research reactor experiments.
Poisson's Ratio	0.24	Typical for an HCP lanthanide. Used in thermal stress modeling of Er:YAG laser crystals under pulsed pump loading and in FEA of Er₂O₃-doped ceramic components in nuclear control rod assemblies.

Chemical Properties

Property	Value / Behavior	Notes
Oxidation States	+3 only (Er³⁺: ErCl₃, Er₂O₃, Er(NO₃)₃·5H₂O); no +2 or +4 under ordinary conditions	Er³⁺ chemistry follows standard trivalent lanthanide patterns — forms stable salts, precipitates as Er(OH)₃ above pH ~7, forms strong chelates with EDTA and macrocyclic ligands. Er³⁺ aqueous solutions are pale pink (from weak 4f-4f absorptions); Er₂O₃ powder is also pale pink, used as a colorant for specialty glasses (Er-doped glass has characteristic pink-red absorption bands at 520 and 655 nm) and as the precursor for all Er-doped optical fiber and crystal applications.
Corrosion Resistance	Moderate in dry air; Er₂O₃ surface forms slowly; reacts with moist air and water; dissolves in dilute acids	Er metal tarnishes in moist air within hours but is more stable than the lighter lanthanides (La, Ce, Pr) in dry conditions. Er should be stored under inert atmosphere for prolonged periods. Er₂O₃ is a stable, refractory oxide (mp ~2,344 °C) used as a thermal barrier coating additive and as a sintering aid in transparent Er₂O₃ ceramics for high-power laser windows.
Surface Oxide	Er₂O₃ (cubic C-type structure, pale pink) forms in air	Er₂O₃ is the standard precursor for Er-doped optical fiber fabrication (Er(NO₃)₃ or ErCl₃ solution impregnation of porous SiO₂ soot in MCVD/OVD preform processes), for Er:YAG crystal growth (Er₂O₃ + Y₂O₃ + Al₂O₃ melt), and for Er-doped phosphor synthesis. Er₂O₃ nanoparticles are studied as upconversion materials (NIR→visible photon conversion) for biological imaging and solar cell enhancement.

Identifier	Value
Symbol	Er
Atomic Number	68
CAS Number	7440-52-0
UN Number	UN3089 (powder)
EINECS Number	231-160-1

Isotope	Type	Notes
¹⁶²Er	Stable	0.139% natural abundance; I = 0. Least abundant Er isotope; used as an enriched IDMS spike for Er concentration measurement in geological and environmental samples. ¹⁶²Er(p,n)¹⁶²Tm reaction has been investigated for production of ¹⁶²Tm (t½ = 21.7 min), a potential short-lived Auger electron emitter for targeted radiotherapy research.
¹⁶⁴Er	Stable	1.601% natural abundance; I = 0. Used as a reference isotope in Er isotope ratio measurements by MC-ICP-MS for REE geochemistry. ¹⁶⁴Er(n,γ)¹⁶⁵Er (σ = 2.7 barn) produces ¹⁶⁵Er (t½ = 10.36 hr, EC), used as a radiotracer in Er solubility and transport studies in high-temperature hydrothermal systems.
¹⁶⁶Er	Stable	33.503% natural abundance — the most abundant Er isotope; I = 0. Dominates Er isotopic composition in all natural and synthetic Er materials. ¹⁶⁶Er(n,γ)¹⁶⁷Er (σ = 1.9 barn) is used to produce ¹⁶⁶Ho (via ¹⁶⁶Er → ¹⁶⁶Ho by β⁻ after ¹⁶⁶Er neutron activation actually requires two-step: ¹⁶⁵Ho(n,γ)¹⁶⁶Ho is the direct route); enriched ¹⁶⁶Er is used in geochemical tracer studies and in calibrating Er concentration in EDFA fiber preform quality control.
¹⁶⁷Er	Stable	22.869% natural abundance; I = 7/2, NMR-active. ¹⁶⁷Er NMR (large quadrupole moment — broad lines in low-symmetry; sharp in high-symmetry environments) is used to characterize Er³⁺ site symmetry in optical host crystals (Er:Y₂SiO₅, Er:LiNbO₃) for quantum memory applications. At cryogenic temperatures (4 K), ¹⁶⁷Er nuclear spin (I = 7/2) couples to the optical transition, enabling nuclear spin-photon entanglement — a key resource for Er-based quantum network nodes. σ(thermal) = 659 barn — significant neutron absorber.
¹⁶⁸Er	Stable	26.978% natural abundance; I = 0. Used as the primary normalization isotope in Er isotope ratio measurements (¹⁶⁸Er/¹⁶⁶Er) for REE fractionation studies. ¹⁶⁸Er enriched targets are used in proton irradiation experiments to produce ¹⁶⁸Tm (t½ = 93.1 days, γ emitter), a candidate source for industrial radiography and calibration standards.
¹⁷⁰Er	Stable	14.910% natural abundance; I = 0. ¹⁷⁰Er(n,γ)¹⁷¹Er (σ = 5.8 barn) produces ¹⁷¹Er (t½ = 7.516 hr, β⁻), used as a radiotracer in Er diffusion and grain boundary segregation studies in optical ceramics and in Er-doped fiber preform characterization. ¹⁷⁰Er is the isotope of interest for neutron activation analysis (NAA) of Er in geological and industrial samples.

Scientific & Research Applications

Use Case	Form Typically Used	Description
Quantum Memory & Quantum Network Nodes	Er:Y₂SiO₅ (YSO), Er:LiNbO₃, Er:Si₃N₄ crystals and waveguides (Er concentration 1–100 ppm)	Er³⁺ in crystalline hosts at 4 K has optical coherence times (T₂) of up to ~4 ms (Er:Y₂SiO₅) — among the longest of any solid-state system at telecom wavelength. ¹⁶⁷Er nuclear spin (I = 7/2) enables nuclear spin-photon entanglement for quantum repeater nodes directly compatible with existing fiber telecom infrastructure at 1,530 nm. Er:LiNbO₃ waveguides combining electro-optic modulation with Er³⁺ emission are leading platforms for integrated quantum photonic circuits.
Erbium-Doped Fiber Amplifiers (EDFA) Research	Er-doped silica fiber preform (Er concentration 100–2,000 ppm by weight; Al₂O₃ co-doping); Er₂O₃ or Er(NO₃)₃ precursor	EDFAs amplify optical signals at 1,530–1,565 nm (C-band) and 1,565–1,625 nm (L-band) with gain of 20–40 dB and noise figure of 3–5 dB, using 980 nm or 1,480 nm pump lasers. Research focuses on Er-doped waveguide amplifiers (EDWA) in silica, Al₂O₃, and Si₃N₄ platforms for on-chip amplification, and on Er:fiber amplifiers with extended bandwidth for future high-capacity systems.
Er:YAG & Er:YSGG Laser Research	Er:YAG single crystals (0.5–3 at% Er); Er:YSGG crystals; grown from oxide melts by Czochralski method	Er:YAG (2,940 nm) is the most strongly water-absorbed laser wavelength available — the absorption coefficient of water at 2.94 µm is ~12,000 cm⁻¹, giving a tissue ablation depth of ~1 µm per pulse at typical fluences. Research into Er:YAG pulse shaping, fiber delivery (zirconium fluoride or hollow-core fibers), and combination with Nd:YAG for composite dental procedures drives ongoing development.
Upconversion Nanoparticle Research	Er³⁺/Yb³⁺ co-doped NaYF₄ nanoparticles (10–50 nm, synthesized from REE chlorides)	Er³⁺/Yb³⁺ co-doped upconversion nanoparticles (UCNPs) convert 980 nm NIR excitation to visible emission (green ~540 nm and red ~660 nm from Er³⁺) via sequential two-photon absorption. Used as biological imaging probes (no autofluorescence background, deep tissue penetration of 980 nm excitation), anti-counterfeiting inks (invisible NIR excitation → visible emission), and NIR-to-visible solar cell enhancers.
Spectroscopy & Rare-Earth Ion Probes	Er³⁺ doped glasses and crystals; Er(III) solution standards (ErCl₃ or Er(NO₃)₃)	Er³⁺'s 4f-4f absorption spectrum (visible pink absorptions at 520/655 nm, NIR absorptions at 800/980/1530 nm) serves as a wavelength calibration standard for spectrophotometers and optical spectrum analyzers across the 400–1,600 nm range. Er³⁺ luminescence lifetime (~10 ms in silica glass, ~1.2 ms in Er:YAG) is used to characterize energy transfer, concentration quenching, and OH impurity content in optical glasses and crystals.

Industrial & Commercial Applications

Sector	Form / Grade Used	Description
Telecommunications (EDFA / DWDM)	Er-doped single-mode fiber (SMF-28 core + Er-doped Al₂O₃-SiO₂ inner cladding, 99.9%+ Er₂O₃ precursor)	EDFAs are the universal optical amplifier in long-haul fiber networks — every transoceanic submarine cable (e.g., MAREA, FASTER, HunTec, AJC) uses Er-doped fiber amplifiers at ~80 km intervals to compensate fiber loss. Commercial EDFAs provide 20–40 dB gain across the C-band (1,530–1,565 nm) with <5 dB noise figure, amplifying up to 96 wavelength channels simultaneously in DWDM systems carrying 400 Gb/s per channel.
Medical & Dental Lasers	Er:YAG laser crystals (2,940 nm, 0.5–3 at% Er); Er:YSGG (2,790 nm); 1,550 nm Er fiber lasers	Er:YAG lasers are the standard for dental hard tissue (enamel, dentin, bone) ablation without anesthesia, skin resurfacing (ablative fractional Er:YAG for wrinkle and scar treatment), and ophthalmic procedures. Eye-safe 1,550 nm Er fiber lasers (up to several watts CW) are used for rangefinders, laser radar (LIDAR), and eye-safe industrial marking where human eye exposure is possible. Global medical/dental Er laser market exceeds $500M/year.
Glass & Ceramic Colorant	Er₂O₃ powder (0.1–3 wt% addition to glass batch, 99%+ purity)	Er₂O₃ additions to glass produce characteristic pink-rose coloration from Er³⁺ 4f-4f absorptions at 520 nm (green) and 655 nm (red), transmitted as pink by subtractive color. Used in decorative crystal glassware, specialty optical filter glass, and as a colorant in dental zirconia ceramics (Er-doped translucent zirconia) that must match natural tooth color while maintaining mechanical strength.
Alloying & Metallurgical Additive	Er metal or Er₂O₃ additions (0.1–1 wt%) to Al, Mg, and Cu alloys	Er additions to Al alloys (Er-Al, Er-Mg-Zr alloy series) refine grain size, increase recrystallization temperature, and improve elevated-temperature strength through Al₃Er dispersoid formation — studied as an alternative to Sc additions in high-strength Al alloys for aerospace applications. Er additions to Mg alloys improve oxidation resistance and high-temperature mechanical properties for automotive and aerospace castings.

Purity	Description
99% (2N)	Commercial-grade erbium for general alloying and optical uses.
99.9% (3N)	High-purity grade ideal for optical amplifiers, lasers, and research.

Synonym / Alternative Name	Context
Er	Chemical symbol; from Ytterby, a village near Stockholm, Sweden, where the mineral gadolinite (containing Er, Tb, Yb, and Y) was first found — Er shares its etymological origin with Terbium (Tb), Ytterbium (Yb), and Yttrium (Y), all named for the same village by Carl Gustaf Mosander (1843). Used as primary identifier in fiber optic specifications (ITU-T G.662 EDFA standards), ICP-MS REE databases, and photonics literature.
Er metal	Abbreviated commercial designation for elemental Er in ingot, rod, foil, or powder form; used in sputtering target datasheets, Er:YAG crystal growth specification documents, and rare-earth metal supplier catalogs for EDFA-grade Er₂O₃ precursor sourcing.
Er element	Scientific designation distinguishing elemental Er from Er compounds (ErCl₃, Er₂O₃, Er:YAG); used in condensed matter physics literature on Er magnetic ordering, surface science papers on Er silicide formation, and quantum information papers specifying Er³⁺ spin properties in ¹⁶⁷Er-enriched host crystals.
Erbium metal	Full commercial designation used in REACH/RoHS compliance documentation, ASTM standards for REE metals, and industrial procurement specifications for Er metal additions to Al and Mg alloys and for Er-bearing sputtering target production.
Erbium element	Scientific designation used in academic databases (WebElements, NIST Atomic Spectra Database) and online educational resources; used in photonics textbooks to specify the Er³⁺ ion properties responsible for EDFA operation, as distinct from metallic Er or Er compounds.
Erbium rare earth metal	Trade and regulatory designation classifying Er among the heavy rare-earth elements (HREEs) on critical materials lists; used in supply chain analysis and policy documents assessing Er criticality for telecommunications infrastructure (EDFA dependence on Er supply) and for medical laser manufacturing.
Erbium rare earth element	Geochemical and mineralogical designation used in REE deposit assessments (xenotime, euxenite, ion-adsorption clay deposits as Er sources), in IUPAC nomenclature for Er minerals, and in environmental monitoring of REE contamination from rare-earth processing operations.
Element 68	Periodic table designation used in XRF/ICP-MS analytical software, nuclear data libraries (ENDF/B-VIII for ¹⁶⁷Er thermal neutron cross-section at 659 barn), and reactor physics codes tracking Er as a neutron absorber in Er-doped nuclear fuel and control rod materials.

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