Yttrium(III) oxide
Yttrium(III) oxide
IUPAC name
Yttrium(III) oxide.
Other names
diyttrium trioxide,
yttrium sesquioxide
3D model (JSmol)
ECHA InfoCard 100.013.849 Edit this at Wikidata
EC Number
  • 215-233-5
RTECS number
  • ZG3850000
  • InChI=1S/3O.2Y
  • O=[Y]O[Y]=O
Molar mass 225.81 g/mol
Appearance White solid.
Density 5.010 g/cm3, solid
Melting point 2,425 °C (4,397 °F; 2,698 K)
Boiling point 4,300 °C (7,770 °F; 4,570 K)
Solubility in alcohol
+44.4·10−6 cm3/mol[1]
Cubic (bixbyite), cI80[2]
Ia3 (No. 206)
99.08 J/mol·K [3]
-1905.310 kJ/mol [3]
-1816.609 kJ/mol [3]
Lethal dose or concentration (LD, LC):
>10,000 mg/kg (rat, oral)
>6000 mg/kg (mouse, oral)[4]
Related compounds
Other anions
Yttrium(III) sulfide
Other cations
Scandium(III) oxide,
Lutetium(III) oxide
Related compounds
Yttrium barium
copper oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance.

The thermal conductivity of yttrium oxide is 27 W/(m·K).[5]



Yttrium oxide is widely used to make Eu:YVO4 and Eu:Y2O3 phosphors that give the red color in color TV picture tubes.

Yttria lasers

Y2O3 is a prospective solid-state laser material. In particular, lasers with ytterbium as dopant allow the efficient operation both in continuous operation[6] and in pulsed regimes.[7] 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.[8] (Yttria-based lasers are not to be confused with YAG lasers using yttrium aluminium garnet, a widely used crystal host for rare earth laser dopants).

Gas lighting

The original use of the mineral yttria and the purpose of its extraction from mineral sources was as part of the process of making gas mantles and other products for turning the flames of artificially-produced gases (initially hydrogen, later coal gas, paraffin, or other products) into human-visible light. This use is almost obsolete - thorium and cerium oxides are larger components of such products these days.

Dental ceramics

Yttrium oxide is used to stabilize the Zirconia in late-generation porcelain-free metal-free dental ceramics. This is a very hard ceramic used as a strong base material in some full ceramic restorations.[9] The zirconia used in dentistry is zirconium oxide which has been stabilized with the addition of yttrium oxide. The full name of zirconia used in dentistry is "yttria-stabilized zirconia" or YSZ.

Microwave filters

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.

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.

High-temperature coatings

Y2O3 is used in specialty coatings and pastes that can withstand high temperatures and act as a barrier for reactive metals such as uranium.[10]

Heat radiators

NASA developed a material it dubbed Solar White that it is exploring for use as a radiator in deep space, where it is expected to reflect more than 99.9% of the sun’s energy (low solar radiation absorption and high infrared emittance).[11] A sphere covered with a 10 mm coating sited far from the Earth and 1 astronomical unit from the sun could keep temperatures below 50 K. One use is long-term cryogenic storage.[12]

Natural occurrence

Yttriaite-(Y), approved as a new mineral species in 2010, is the natural form of yttria. It is exceedingly rare, occurring as inclusions in native tungsten particles in a placer deposit of the Bol’shaja Pol’ja (Russian: Большая Полья) river, Prepolar Ural, Siberia. As a chemical component of other minerals, the oxide yttria was first isolated in 1789 by Johan Gadolin, from rare-earth minerals in a mine at the Swedish town of Ytterby, near Stockholm.[13]

See also


  1. ^ "Handbook of Chemistry and Physics 102nd Edition". CRC Press.
  2. ^ Yong-Nian Xu; Zhong-quan Gu; W. Y. Ching (1997). "Electronic, structural, and optical properties of crystalline yttria". Phys. Rev. B56 (23): 14993–15000. Bibcode:1997PhRvB..5614993X. doi:10.1103/PhysRevB.56.14993.
  3. ^ a b c R. Robie, B. Hemingway, and J. Fisher, “Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures,” US Geol. Surv., vol. 1452, 1978. [1]
  4. ^ "Yttrium compounds (as Y)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  5. ^ P. H. Klein & W. J. Croft (1967). "Thermal conductivity , Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77-300 K". J. Appl. Phys. 38 (4): 1603. Bibcode:1967JAP....38.1603K. doi:10.1063/1.1709730.
  6. ^ J. Kong; D.Y.Tang; B. Zhao; J.Lu; K.Ueda; H.Yagi; T.Yanagitani (2005). "9.2-W diode-pumped Yb:Y2O3 ceramic laser". Applied Physics Letters. 86 (16): 161116. Bibcode:2005ApPhL..86p1116K. doi:10.1063/1.1914958.
  7. ^ M.Tokurakawa; K.Takaichi; A.Shirakawa; K.Ueda; H.Yagi; T.Yanagitani; A.A. Kaminskii (2007). "Diode-pumped 188 fs mode-locked Yb3+:Y2O3 ceramic laser". Appl. Phys. Lett. 90 (7): 071101. Bibcode:2007ApPhL..90g1101T. doi:10.1063/1.2476385.
  8. ^ 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 (20): 201901. Bibcode:2007ApPhL..90t1901B. doi:10.1063/1.2739318.
  9. ^ Shen, James, ed. (2013). Advanced ceramics for dentistry (1st ed.). Amsterdam: Elsevier/BH. p. 271. ISBN 978-0123946195.
  10. ^ Padmanabhan, P. V. A.; Ramanathan, S.; Sreekumar, K. P.; Satpute, R. U.; Kutty, T. R. G.; Gonal, M. R.; Gantayet, L. M. (2007-12-15). "Synthesis of thermal spray grade yttrium oxide powder and its application for plasma spray deposition". Materials Chemistry and Physics. 106 (2): 416–421. doi:10.1016/j.matchemphys.2007.06.027. ISSN 0254-0584.
  12. ^ Youngquist, Robert (2016-05-13). "Cryogenic Selective Surfaces - NASA". Retrieved 2024-02-27.
  13. ^ Mindat,