Europium(III) phosphate is one of the
phosphates of
europium, with the chemical formula of EuPO4. Other phosphates include
europium(II) phosphate (Eu3(PO4)2) and europium(II,III) phosphate (Eu3Eu(PO4)3).[7]
Preparation
Europium phosphate can be produced by the
sol-gel method of
europium(III) oxide. First, europium(III) oxide was dissolved in an equimolar amount of
nitric acid, and then an excess of 10%
phosphoric acid was added. The process also requires the addition of
ammonia to adjust the
pH to 4 and form a
gel, which is then washed with
water and heated to 1200 °C for a day.[5][6]
Properties
Europium(III) phosphate is isotypic to CePO4 and crystallizes in the
monazitestructure type, in the space group P21/n (no. 14, position 2) with the lattice parameters a = 668.13(10), b = 686.18(9), c = 634.91(8) pm and β = 103.96(1)° with four formula units per unit cell.[2] Its
heat capacity is 111.5 J·K−1·mol−1 at 298.15 K,[5][6] and its
bulk modulus is 159(2) GPa.[8]
^Hughes, John M.; Kohn, Matthew J.; Rakovan, John (2018). Phosphates : Geochemical, Geobiological and Materials Importance. Berlin. p. 91.
ISBN978-1-5015-0963-6.
OCLC1083603252.{{
cite book}}: CS1 maint: location missing publisher (
link)
^
abcGavrichev, K. S.; Ryumin, M. A.; Tyurin, A. V.; Gurevich, V. M.; Komissarova, L. N. (2009). "The heat capacity and thermodynamic functions of EuPO4 over the temperature range 0–1600 K". Russian Journal of Physical Chemistry A. 83 (6). Pleiades Publishing Ltd: 901–906.
Bibcode:
2009RJPCA..83..901G.
doi:
10.1134/s0036024409060053.
ISSN0036-0244.
S2CID98200684.
^Grunwald, Waldemar; Wittich, Knut; Glaum, Robert (2018-08-06). "Anhydrous Europium Phosphates: A Comprehensive Report on Syntheses, Crystal Structures, and Phase Relations". Zeitschrift für anorganische und allgemeine Chemie. 644 (22). Wiley: 1403–1414.
doi:
10.1002/zaac.201800193.
ISSN0044-2313.
S2CID104565178.