Solid phase
Official name
Molybdenum trioxide
Secondary names
Molybdic anhydride; Molybdite; Molybdic trioxide; Molybdenum(VI) oxide; trioxomolybdenum
CAS number
1313-27-5
Type
Family
covalent network solid
Class
sheet covalent network solid
Compound type
oxide
Chemical composition
Formula
$MoO_3$
Chemical formula
MoO3
Elemental formula
Mo O3
Isotope mixture type
terrestrial abundance
8.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Mo$ Molybdenum element 1 0.25 1 constituent element main
$O$ Oxygen element 3 0.75 1 constituent element main
Chemical bonds
  Bond Number
$\geq \mid Mo-O-$ 6
Class
sheet covalent networks (10)
Type
one metal and one non-metal atoms sheet networks (10.04)
Equivalent mineral
Molybdite
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pnma
Molar mass
143.95 $g/mol$
Density
4.70 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid MoO3 > 802°C (> 1075 K)
Refringence type
biaxial
Refringence sign
unknown
Refraction index $n_{\alpha}$
2.12 - 2.13
Pure color
colorless
Color
colorless, white, yellow (high T), light blue, light green
Diaphaneity
transparent
Luster
adamantine
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