12055-62-8

Basic information

• Product Name: HOLMIUM OXIDE
• Synonyms: UV-VIS STANDARD 6;UV-VIS STANDARD 6: HOLMIUM OXIDE SOLUTION;HOLMIUM(+3)OXIDE;HOLMIUM(III) OXIDE;HOLMIUM OXIDE;holmiumoxide(ho2o3);Rare earth ;Holmium (III) oxide (99.9%-Ho) (REO)
• CAS NO: 12055-62-8
• Molecular Formula: Ho2O3
• Molecular Weight: 377.86
• EINECS: 235-015-3
• Product Categories: Rare earth;67: Ho;HolmiumMaterials Science;Catalysis and Inorganic Chemistry;Chemical Synthesis;HolmiumMetal and Ceramic Science;Nanomaterials;Nanoparticles: Oxides, Nitrides, and Other CeramicsNanomaterials;Nanopowders and Nanoparticle Dispersions;Oxides;metal oxide
• Mol File: 12055-62-8.mol

Chemical Properties

• Melting Point: >100 °C(lit.)
• Appearance: Light yellow-orange to beige/nanopowder
• Density: 1.0966 g/mL at 25 °C
• Storage Temp.: Storage temperature: no restrictions.
• Water Solubility: Insoluble in water. Soluble in perchloric acids.
• Stability: Stable, but may be air or moisture sensitive. Incompatible with strong acids.
• Merck: 14,4727
• CAS DataBase Reference: HOLMIUM OXIDE(CAS DataBase Reference)
• NIST Chemistry Reference: HOLMIUM OXIDE(12055-62-8)
• EPA Substance Registry System: HOLMIUM OXIDE(12055-62-8)

Safety Data

• Safety Statements: 22-24/25
• WGK Germany: 3
• F: 3-10-23
• TSCA: Yes
• Hazardous Substances Data: 12055-62-8(Hazardous Substances Data)

Usage

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.

InChI:InChI=1/2Ho.3O/rHo2O3/c3-1-5-2-4

Upstream product

• 13598-41-9 holmium 
• 80937-33-3 oxygen 
• 10024-97-2 dinitrogen monoxide 

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In-situ formation of HOLMIUM OXIDE (cas 12055-62-8) in pores of Mesoporous Carbon Nanoparticles as substrates for neutron-activatable radiotherapeutics07/30/2019

Radionuclide therapy with nano-sized carriers is a very promising approach to treat various types of cancer. The preparation of radioactive nanocarriers can be achieved with minimum handling using a neutron-activation approach. However, the nanocarrier material must possess certain characteristi...detailed

Structural features of nanocrystalline HOLMIUM OXIDE (cas 12055-62-8) prepared by the thermal decomposition of organic precursors07/28/2019

Powders of nanostructured holmium oxide (C-Ho2O3) with the crystallite sizes ranging from 6 to 16 nm have been prepared in bulk from the thermal decomposition of holmium acetate and carbamide-containing complex of holmium as precursors at 600 and 700 °C. The powders obtained have been investiga...detailed

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Relevant articles and documents

Temperature dependent rate constants for the reactions of gas phase lanthanides with N2O

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

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.