Solid phase
Official name
Lanthanum trifluoride
Secondary names
Lanthanum(III) fluoride
CAS number
13709-38-1
Type
Family
ionic solid
Class
normal salt
Compound type
fluoride
Chemical composition
Formula
$LaF_3$
Chemical formula
LaF3
Elemental formula
(La3+) (F-)3
Isotope mixture type
terrestrial abundance
8.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$La^{3+}$ Lanthanum cation element 1 0.25 1 constituent cation main
$F^-$ Fluoride anion element 3 0.75 1 constituent anion main
Chemical bonds
  Bond Number
$\cdot (\cdot) La^{3+} \cdot F^{-}$ 3
Class
normal salts (07)
Type
simple normal salts (07.01)
Equivalent mineral
Fluocerite-(La)
Phase type
crystalline
Crystal system
trigonal
Crystal class
ditrigonal-scalenohedral
Crystal class symbol
-3m (D3d)
Crystal spacegroup
P-3c1
Molar mass
195.9 $g/mol$
Density
5.9 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid $LaF_3$ 1493°C (1766 K)
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.006
Refraction index $n_{\alpha}$
1.609
Refraction index $n_{\beta}$
1.603
Pure color
white
Color
white
Diaphaneity
transparent to translucent
Luster
vitreous
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