Solid phase
Official name
Paratellurite
Secondary names
Tellurium(IV) oxide; α-TeO2
CAS number
7446-07-3
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
tellurite
Paratellurite - α-TeO_2
Chemical composition
Formula
$TeO_2$
Chemical formula
TeO2
Elemental formula
Te O2
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Te$ Tellurium element 1 0.3333333333333333 1 constituent element main
$O$ Oxygen element 2 0.6666666666666666 1 constituent element main
Chemical bonds
  Bond Number
$\geq Te-O-$ 4
Class
tridimensional covalent networks (11)
Type
two non-metal (or one metalloid and one non-metal) atoms tridimensional networks (11.03)
Phase name
alpha-TeO2
Phase type
crystalline
Crystal system
tetragonal
Crystal class
trapezohedral
Crystal class symbol
422 (D4)
Crystal spacegroup
P4(1)2(1)2
Molar mass
159.6 $g/mol$
Density
6.04 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid TeO2 732°C (1005K)
solid-liquid beta-TeO2 at high pressure
Phase transitions comments
beta-TeO2 is metastable at room pressure
Refringence type
uniaxial
Refraction index $n_{\alpha}$
2.24
Pure color
colorless
Color
colorless, white
Diaphaneity
transparent to translucent
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