Yttrium(iii) Oxide

Information about Yttrium(iii) Oxide

Yttrium(III) oxide

General
Systematic name	Yttrium(III) oxide.
Other names	Yttria, diyttrium trioxide
Molecular formula	Y₂O₃
Molar mass	225.81 g/mol
Appearance	White solid.
CAS number	[1314-36-9]
Properties
Density and phase	5.010 g/cm³, solid
Solubility	insoluble in water soluble in alcohol soluble in acids insoluble in alkalis.
Stability	Slightly hygroscopic
Melting point	2690 °C
Boiling point	4300 °C
Structure
Coordination geometry	Octahedral
Crystal structure	Cubic, Bixbyite [1]
Thermodynamic data
Standard enthalpy of formation Δ_fH°_solid	? kJ/mol
Standard molar entropy S°_solid	? J.K⁻¹.mol⁻¹
Hazards
EU classification	None listed.
R-phrases	Not hazardous
S-phrases	S24/25
EU classification	None listed.
RTECS	ZG3850000
NFPA 704
Supplementary data page
Structure and properties	n, ε_r, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	?
Other cations	Scandium(III) oxide, Lanthanum(III) oxide
Related compounds	Yttrium barium copper oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

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

Uses

In material 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.

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

0.5 Y₂O₃ + 2 BaO + 3 CuO + 0.25 O₂ → YBa₂Cu₃O₇

This synthesis is typically conducted at 800 °C.

The thermal conductivity of yttrium oxide was measured as 27 W/m/K.^[1]

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.

References

1. ^ P. H. Klein and W. J. Croft, “Thermal conductivity , Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77°-300°K,” J. Appl. Phys. 38, 1603 (1967)

External links

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Molar mass, symbol M,^[1] is the mass of one mole of a substance (chemical element or chemical compound).^[2] It is a physical property which is characteristic of each pure substance.
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In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e. density, crystal structure, index of refraction, and so forth).
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Water is a common chemical substance that is essential to all known forms of life.^[1] In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapor.
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alcohol is any organic compound in which a hydroxyl group (-OH) is bound to a carbon atom of an alkyl or substituted alkyl group. The general formula for a simple acyclic alcohol is C_nH_2n+1OH.
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alkali (from Arabic: Al-Qalyالقلي, القالي ) is a basic, ionic salt of an alkali metal or alkaline earth metal element.
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Hygroscopy is the ability of a substance to attract water molecules from the surrounding environment through either absorption or adsorption.

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boiling point of a liquid is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid.^[1]^[2]^[3]^[4]
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The coordination geometry of an atom is the geometrical pattern formed by the coordination of ligands to a metal in a molecule or a coordination complex. The geometrical arrangement of the ligands vary according to the number of ligands bonded to the metal centre, and to the
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crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a motif, a set of atoms arranged in a particular way, and a lattice. Motifs are located upon the points of a lattice, which is an array of points repeating periodically in three
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Cubic may refer to:

General

cubicle, a small area set off by walls for special use, such as a place to work, to shower, or with a toilet

Science and mathematics

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In chemistry, the standard molar entropy is the entropy content of one mole of substance, under conditions of standard temperature and pressure (STP).

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NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. It defines the colloquial "fire diamond" used by emergency personnel to quickly and easily identify the risks posed by nearby hazardous materials.
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Yttrium oxide is Y₂O₃. It is an air-stable, white substance. Yttrium oxide is used as a common starting material for both material science as well as inorganic compounds.
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The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. For example, typical glass has a refractive index of 1.
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Infrared spectroscopy (IR spectroscopy) is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. It covers a range of techniques, the most common being a form of absorption spectroscopy.
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Nuclear magnetic resonance spectroscopy most commonly known as NMR spectroscopy is the name given to the technique which exploits the magnetic properties of certain nuclei. This phenomenon and its origins are detailed in a separate section on Nuclear magnetic resonance.
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