Solid phase
Official name
Lanthanum(III) phosphate
Secondary names
Lanthanum phosphate; Lanthanum orthophosphate; lanthanum(3+);phosphate; Phosphoric acid, lanthanum(3+) salt (1:1); Monazite-(La); monoclinic-LaPO4; LaPO4-mon; LaPO4-rt
CAS number
13778-59-1
Type
Family
ionic solid
Class
normal salt
Compound type
phosphate
Chemical composition
Formula
$La^{3+} \cdot PO_4^{3-}$
Chemical formula
LaPO4
Elemental formula
(La3+) P O (O-)3
Isotope mixture type
terrestrial abundance
4.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$La^{3+}$ Lanthanum cation element 1 0.5 1 constituent cation main
$(PO_4)^{3-}$ Phosphate anion chemical function 1 0.5 1 anionic radical main
Chemical functions
  Function Number
$(PO_4)^{3-}$ 1
Chemical bonds
  Bond Number
$\cdot (\cdot) La^{3+} \cdot O^{-}-$ 3
$\dddot - \dddot - \dddot - P \dddot - O^{-3/4}$ 4
Class
normal salts (07)
Type
simple normal salts (07.01)
Phase name
monoclinic-LaPO4
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
P2(1)/c
Molar mass
233.877 $g/mol$
Density
4.93 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid hexagonal-LaPO4 above ?? K
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.050 - 0.060
Refraction index $n_{\alpha}$
1.770 - 1.800
Refraction index $n_{\beta}$
1.771 - 1.802
Refraction index $n_{\gamma}$
1.830 - 1.850
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