12055-62-8 Usage
Description
Holmium oxide, also known as Holmia, is a light yellow powder that occurs in nature, usually associated with small quantities of other rare-earth oxides. It is one of the most paramagnetic substances known and has a slightly beige solid appearance. Holmium oxide is characterized by its yellow cubic crystal structure, a density of 8.41 g/cm3, and a melting point of 2,415°C. It is insoluble in water but dissolves in acids with reactions.
Uses
1. Used in Ceramics and Glass Industry:
Holmium oxide is used as a colorant for cubic zirconia and glass, providing yellow or red coloring.
2. Used in Optical Spectrophotometers:
Holmium oxide serves as a calibration standard for optical spectrophotometers, ensuring accurate wavelength measurements.
3. Used in Nuclear Reactors:
Holmium can absorb fission-bred neutrons, making it useful in nuclear reactors to control the atomic chain reaction and prevent it from running out of control.
4. Used in Laser Materials:
Holmium oxide is a component in Yttrium-Aluminum-Garnet (YAG) and Yttrium-Lanthanum-Fluoride (YLF) solid-state lasers, which are utilized in microwave equipment found in various medical and dental settings.
5. Used in Refractories and Special Catalysts:
Holmium oxide is employed in the production of refractories and as a specialty catalyst due to its unique chemical properties.
6. Used in Phosphors and Metal Halide Lamps:
Holmium oxide is also used in the manufacturing of phosphors and metal halide lamps, which are essential components in various lighting applications.
Preparation
Holmium oxide is prepared by thermal decomposition of carbonate, oxalate, hydroxide, nitrate, sulfate, or any oxo salt of holmium:
Ho2(CO3)3 →Ho2O3 + 3CO2
Ho2(SO4)3 →Ho2O3 + 3SO3
The oxide may be obtained by direct combination of elements at elevated temperatures. The element in massive form, however, reacts slowly at high temperatures.
Check Digit Verification of cas no
The CAS Registry Mumber 12055-62-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,0,5 and 5 respectively; the second part has 2 digits, 6 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 12055-62:
(7*1)+(6*2)+(5*0)+(4*5)+(3*5)+(2*6)+(1*2)=68
68 % 10 = 8
So 12055-62-8 is a valid CAS Registry Number.
InChI:InChI=1/2Ho.3O/rHo2O3/c3-1-5-2-4
12055-62-8Relevant articles and documents
Temperature dependent rate constants for the reactions of gas phase lanthanides with N2O
Campbell, Mark L.
, p. 562 - 566 (1999)
The reactivity of gas phase lanthanide (Ln) atoms (Ln=La-Yb with the exception of Pm) with N2O from 298 to 623 K is reported. Lanthanide atoms were produced by the photodissociation of Ln(TMHD)3 (TMHD=2,2,6,6-tetramethyl-3,5-heptanat
Temperature-Dependent Rate Constants for the Reactions of Gas-Phase Lanthanides with O2
Campbell, Mark L.
, p. 7274 - 7279 (2007/10/03)
The reactivity of the gas-phase lanthanide atoms Ln (Ln = La-Yb with the exception of Pm) with O2 is reported. Lanthanide atoms were produced by the photodissociation of [Ln(TMHD)3] and detected by laser-induced fluorescence. For all the lanthanides studied with the exception of Yb, the reaction mechanism is bimolecular abstraction of an oxygen atom. The bimolecular rate constants (in molecule-1 cm3 s-1) are described in Arrhenius form by k[Ce(1G4)] = (3.0 ± 0.4) × 10-10 exp(-3.4 ± 1.3 kJ mol-1/RT); Pr(4I9/2), (3.1 ± 0.7) × 10-10 exp(-5.3 ± 1.5 kJ mol-1/RT); Nd(5I4), (3.6 ± 0.3) × 10-10 exp(-6.2 ± 0.4 kJ mol-1/RT); Sm(7F0), (2.4 ± 0.4) × 10-10 exp(-6.2 ± 1.5 kJ mol-1/RT); Eu(8S7/2), (1.7 ± 0.3) × 10-10 exp(-9.6 ± 0.7 kJ mol-1/RT); Gd(9D2), (2.7 ± 0.3) × 10-10 exp(-5.2 ± 0.8 kJ mol-1/RT); Tb(6H15/2), (3.5 ± 0.6) × 10-10 exp(-7.2 ± 0.8 kJ mol-1/RT); Dy(5I8), (2.8 ± 0.6) × 10-10 exp(-9.1 ± 0.9 kJ mol-1/RT); Ho(4I15/2), (2.4 ± 0.4) × 10-10 exp(-9.4 ± 0.8 kJ mol-1/RT); Er(3H6), (3.0 ± 0.8) × 10-10 exp(-10.6 ± 1.1 kJ mol-1/RT); Tm(2F7/2), (2.9 ± 0.2) × 10-10 exp(-11.1 ± 0.4 kJ mol-1/RT), where the uncertainties represent ±2σ. The reaction barriers are found to correlate to the energy required to promote an electron out of the 6s subshell. The reaction of Yb(1S0) with O2 reacts through a termolecular mechanism. The limiting low-pressure third-order rate constants are described in Arrhenius form by k0[Yb(1S0)] = (2.0 ± 1.3) × 10-28 exp(-9.5 ± 2.8 kJ mol-1/RT) molecule-2 cm6 s-1.