Gadolinium(III) oxide | SSHADE

Solid phase

Official name: Gadolinium(III) oxide

Name and identifiers

Secondary names: gadolinium sesquioxide; gadolinium trioxide; Gd2O3
CAS number: 12064-62-9

Family: ionic solid
Class: alkali salt
Compound type: oxide
Comments: the others polymorphes are monoclinic (>1200°C) and trigonal (>2100°C)

Chemical composition

Formula: $Gd_2O_3$
Chemical formula: Gd2O3
Elemental formula: (Gd3+)2 (O2-)3
Isotope mixture type: terrestrial abundance

10.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Gd^{3+}$	Gadolinium cation	element	2	0.4	1	constituent cation	main
	$O^{2-}$	Oxide anion	element	3	0.6	1	constituent anion	main

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$\cdot (\cdot) Gd^{3+} \cdot O^{2-}-$	6

Class: alkali salts (06)
Type: simple alkali salts (06.01)

Crystallography

Phase name: cubic- $Gd_2O_3$
Phase type: crystalline
Crystal system: monoclinic
Crystal class: diploidal
Crystal class symbol: m-3 (Th)
Crystal spacegroup: Ia-3

Physical properties

Molar mass: 362.5 $g/mol$
Density: 7.07 $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-solid	monoclinic $Gd_2O_3$	above 1200°C (1473 K)

Optical properties

Refringence type: biaxial
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent to translucent

Links and Publications

Links

Wikipedia: Gadolinium(III) oxide