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Yttrium(III) oxide
Yttrium(III) oxide
IUPAC name
Other names Yttria,
diyttrium trioxide
CAS number 1314-36-9 Yes check.svgY
RTECS number ZG3850000
Molecular formula Y2O3
Molar mass 225.81 g/mol
Appearance White solid.
Density 5.010 g/cm³, solid
Melting point

2690 °C

Boiling point

4300 °C

Solubility in water insoluble
Solubility in alcohol
Crystal structure Cubic (bixbyite), cI80[1]
Space group Ia-3, No. 206
MSDS External MSDS
EU classification None listed.
R-phrases Not hazardous
S-phrases S24/25
Related compounds
Other cations Scandium(III) oxide,
Lanthanum(III) oxide
Related compounds Yttrium barium
copper oxide
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Yttrium oxide is Y2O3. It is an air-stable, white solid substance. Yttrium oxide is used as a common starting material for both materials science as well as inorganic compounds.




In materials science

It is the most important yttrium compound and is widely used to make YVO4 europium and Y2O3 europium phosphors that give the red color in color TV picture tubes. Yttrium oxide is also used to make yttrium iron garnets, which are very effective microwave filters.

Y2O3 is used to make the high temperature superconductor YBa2Cu3O7, known as "1-2-3" to indicate the ratio of the metal constituents:

2 Y2O3 + 8 BaO + 12 CuO + O2 → 4 YBa2Cu3O7

This synthesis is typically conducted at 800 °C.

The thermal conductivity of yttrium oxide is 27 W/(m·K).[2]

In inorganic synthesis

Yttrium oxide is an important starting point for inorganic compounds. For organometallic chemistry it is converted to YCl3 in a reaction with concentrated hydrochloric acid and ammonium chloride.

In lasers

Y2O3 ceramics is a prospective solid-state laser material. In particular, lasers with ytterbium as dopant allow the efficient operation both in cw operation [3] and in pulsed regimes.[4] At high concentration of excitations (of order of 1%) and poor cooling, the quenching of emission at laser frequency and avalanche broadband emission takes place.[5]


  1. ^ Yong-Nian Xu; Zhong-quan Gu; W. Y. Ching (1997). "Electronic, structural, and optical properties of crystalline yttria". Phys. Rev. B56: 14993–15000. doi:10.1103/PhysRevB.56.14993.  
  2. ^ P. H. Klein and W. J. Croft (1967). "Thermal conductivity , Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77-300 K". J. Appl. Phys. 38: 1603. doi:10.1063/1.1709730.  
  3. ^ J. Kong; D.Y.Tang, B. Zhao, J.Lu, K.Ueda, H.Yagi and T.Yanagitani (2005). "9.2-W diode-pumped Yb:Y2O3 ceramic laser". Applied Physics Letters 86: 161116. doi:10.1063/1.1914958.  
  4. ^ M.Tokurakawa; K.Takaichi, A.Shirakawa, K.Ueda, H.Yagi, T.Yanagitani, and A.A. Kaminskii (2007). "Diode-pumped 188 fs mode-locked Yb3+:Y2O3 ceramic laser". Appl.Phys.Lett. 90: 071101. doi:10.1063/1.2476385.  
  5. ^ J.-F.Bisson; D.Kouznetsov, K.Ueda, S.T.Fredrich-Thornton, K.Petermann, G.Huber (2007). "Switching of emissivity and photoconductivity in highly doped Yb3+:Y2O3 and Lu2O3 ceramics". Appl.Phys.Lett. 90: 201901. doi:10.1063/1.2739318.  

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