Solid phase
Official name
Yttrium oxide
Secondary names
Yttrium trioxide; Yttria; Yttriaite-(Y); Y2O3
CAS number
1314-36-9
Type
Family
ionic solid
Class
alkali salt
Compound type
oxide
Chemical composition
Formula
$Y_2O_3$
Chemical formula
Y2O3
Elemental formula
(Y3+)2 (O2-)3
Isotope mixture type
terrestrial abundance
10.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Y^{3+}$ Yttrium cation element 2 0.4 1 constituent cation main
$O^{2-}$ Oxide anion element 3 0.6 1 constituent anion main
Chemical bonds
  Bond Number
$\cdot (\cdot) Y^{3+} \cdot O^{-}-$ 3
Class
alkali salts (06)
Type
simple alkali salts (06.01)
Equivalent mineral
Yttriaite-(Y)
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
diploidal
Crystal class symbol
m-3 (Th)
Crystal spacegroup
Ia-3
Molar mass
225.809 $g/mol$
Density
5.01 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid Y2O3 2683 K (2410 °C)
Refringence type
isotropic
Refraction index $n_{\alpha}$
1.930
Pure color
white
Color
white
Diaphaneity
transparent to translucent
Luster
adamantine
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