Rubidium

Rubidium

Rubidium (Rb) is a soft, silvery-white alkali metal known for its extreme reactivity, low melting point (39.3 °C), and high electropositivity. It is highly reactive with water and air, igniting spontaneously in moist air. Rubidium has a low ionization energy and forms strong ionic bonds, making it useful in ion-exchange and chemical synthesis. It is paramagnetic and has relatively low thermal and electrical conductivities compared to other metals. Due to its high reactivity, rubidium is typically stored in inert atmospheres or mineral oil.

Goodfellow offers high-purity rubidium for specialized scientific applications. It finds primary applications within atomic physics laboratories where rubidium atoms are employed in laser cooling experiments that form the basis of atomic clocks or quantum computing systems reliant on precise timekeeping mechanisms. The metal also features prominently within specialty glass formulations designed for enhanced optical clarity or radiation shielding purposes due to rubidium’s ability to modify refractive indices effectively when incorporated into silica matrices at controlled concentrations during manufacturing processes—ensuring optimal performance under demanding operational conditions associated with modern optics-based instrumentation platforms worldwide today. Emerging areas benefiting include biomedical imaging techniques leveraging isotope-labeled rubidium tracers capable of noninvasively mapping blood flow dynamics inside living organisms during diagnostic evaluations conducted routinely across healthcare facilities.



General Properties

PropertyValue
Atomic Number37
Density1.532 g/cm³
Melting Point39.3 °C
Boiling Point688 °C
Thermal Conductivity58.2 W/m·K
Electrical Resistivity128 nΩ·m
Crystal StructureBody-Centered Cubic (BCC)

Mechanical Properties

PropertyValue
Tensile Strength~2 MPa
Yield StrengthNot well-defined (extremely soft)
Young’s Modulus2.4 GPa
Hardness~0.3 Mohs
Elongation at BreakVery High (Malleable)
Poisson’s RatioN/A

Chemical Properties

PropertyValue
Corrosion ResistancePoor; reacts violently with air and water
ReactivityExtremely reactive, especially with water and oxygen
Oxidation States+1 (dominant)
Surface OxideRubidium oxide (Rb₂O)
IdentifierValue
SymbolRb
Atomic Number37
CAS Number7440-17-7
UN NumberUN1423
EINECS Number231-126-6
IsotopeTypeNotes
Rb-85Stable72.2% natural abundance
Rb-87Radioactive27.8% - used in atomic clocks and geochronology

Scientific Applications

Use CaseDescription
Atomic ClocksUsed as frequency standard due to hyperfine transitions in Rb-87
Laser CoolingRubidium atoms are commonly used in optical molasses experiments
Quantum OpticsStudies of Bose-Einstein condensates and quantum entanglement
Plasma ResearchUsed in studies of ionized gases and plasma waves
SpectroscopySharp spectral lines useful for calibration and atomic structure studies

Industrial Applications

Use CaseDescription
Specialty GlassImproves stability and conductivity of photoelectric cells
Vacuum TubesUsed as a getter to absorb residual gases
Ion EnginesInvestigated as ion source propellant
Chemical SynthesisAlkali metal for creating organometallic reagents
SeismologyRb isotope ratios used in geological dating
GradeDescription
99.9% (3N)High-purity rubidium suitable for atomic research, quantum computing, and frequency standard applications.
Synonym
Rb
Rubidium metal
Rubidio (Spanish)