Yttrium(III) oxide

Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance.

Yttrium(III) oxide
Yttrium(III) oxide
Names
IUPAC name
Yttrium(III) oxide.
Other names
Yttria,
diyttrium trioxide,
yttrium sesquioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.849
EC Number
  • 215-233-5
RTECS number
  • ZG3850000
UNII
  • InChI=1S/3O.2Y
    Key: SIWVEOZUMHYXCS-UHFFFAOYSA-N
  • O=[Y]O[Y]=O
Properties
Y2O3
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)
insoluble
Solubility in alcohol
acid		 soluble
Structure
Cubic (bixbyite), cI80[1]
Ia3 (No. 206)
Octahedral
Thermochemistry
99.08 J/mol·K [2]
-1905.310 kJ/mol [2]
-1816.609 kJ/mol [2]
Hazards
Lethal dose or concentration (LD, LC):
>10,000 mg/kg (rat, oral)
>6000 mg/kg (mouse, oral)[3]
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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Infobox references

The thermal conductivity of yttrium oxide is 27 W/(m·K).[4]

Uses

Phosphors

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[5] and in pulsed regimes.[6] 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.[7] (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.[8] 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.

Superconductors

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.[9]

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.[10]

See also

References
  1. 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.
  2. 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.
  3. "Yttrium compounds (as Y)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. Shen, James, ed. (2013). Advanced ceramics for dentistry (1st ed.). Amsterdam: Elsevier/BH. p. 271. ISBN 978-0123946195.
  9. 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.
  10. Mindat, http://www.mindat.org/min-40471.html
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