Solid phase
Official name
Molybdenum dioxide
Secondary names
Molybdenum(IV) oxide; Tugarinovite; dioxomolybdenum
CAS number
18868-43-4
Type
Family
metallic solid
Class
true metal
Compound type
metal
Chemical composition
Formula
$MoO_2$
Chemical formula
MoO2
Elemental formula
Mo O2
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Mo$ Molybdenum element 1 0.3333333333333333 1 constituent element main
$O$ Oxygen element 2 0.6666666666666666 1 constituent element main
Chemical bonds
  Bond Number
$\geq \mid Mo-O-$ 6
Class
true metals (13)
Type
homovalent bilayer metals (13.02)
Equivalent mineral
Tugarinovite
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
P2(1)/m
Comments
Distorted rutile structure - Coordination geometry: Octahedral (MoIV); trigonal (O−II)
Molar mass
127.94 $g/mol$
Density
6.47 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid decomposition > 1100°C (> 1370 K)
Refringence type
biaxial
Refringence sign
unknown
Pure color
violet
Color
violet, brownish
Diaphaneity
translucent
Luster
greasy
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