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Europium(III) phosphate

Identifiers
CAS Number	13537-10-5 hydrate: 14913-20-3 15259-63-9 semihydrate dihydrate: 34377-51-0 trihydrate: 49836-68-2
3D model (JSmol)	Interactive image hydrate: Interactive image dihydrate: Interactive image trihydrate: Interactive image
ChemSpider	4896052
ECHA InfoCard	100.033.532
EC Number	236-901-2 hydrate: 693-463-9
PubChem CID	6365242 hydrate: 16217374
CompTox Dashboard (EPA)	DTXSID80928975 hydrate: DTXSID20584352
InChI InChI=1S/Eu.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/p-3Key: VTZYNNDLDPSINP-UHFFFAOYSA-K hydrate: InChI=1S/Eu.H3O4P.H2O/c;1-5(2,3)4;/h;(H3,1,2,3,4);1H2/q+3;;/p-3Key: BOCFVANIXFYKBV-UHFFFAOYSA-K
SMILES P(=O)I(). hydrate: P(=O)I()..O dihydrate: P(=O)I()..O.O trihydrate: P(=O)I()..O.O.O
Properties
Chemical formula	EuO4P
Molar mass	246.934 g·mol
Appearance	colourless solid
Density	5.81 g·cm
Melting point	2,200 °C (3,990 °F; 2,470 K)
Solubility in water	insoluble
Structure
Crystal structure	Monazite
Space group	P21/n (No. 14)
Lattice constant	a = 668.13(10), b = 686.18(9), c =  634.91(8) pmα = 90°, β =  103.96(1)°, γ = 90°
Thermochemistry
Heat capacity (C)	111.5 J/mol·K
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

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).

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.

Properties

Europium(III) phosphate is isotypic to CePO₄ and crystallizes in the monazite structure 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. Its heat capacity is 111.5 J·K·mol at 298.15 K, and its bulk modulus is 159(2) GPa.

References

1. Macintyre, J. E.; Chapman and Hall (1992). Dictionary of inorganic compounds. London: Chapman & Hall. p. 3124. ISBN 0-412-30120-2. OCLC 26338506.
2. ^ Ni, Yunxiang; Hughes, John M.; Mariano, Anthony N. (1995-02-01). "Crystal chemistry of the monazite and xenotime structures". American Mineralogist. 80 (1–2). Mineralogical Society of America: 21–26. Bibcode:1995AmMin..80...21N. doi:10.2138/am-1995-1-203. ISSN 0003-004X. S2CID 55776047.
3. "Europium Phosphate – ProChem, Inc". prochemonline.com. Archived from the original on 2021-06-22. Retrieved 2022-06-08.
4. Hughes, John M.; Kohn, Matthew J.; Rakovan, John (2018). Phosphates : Geochemical, Geobiological and Materials Importance. Berlin. p. 91. ISBN 978-1-5015-0963-6. OCLC 1083603252.{{cite book}}: CS1 maint: location missing publisher (link)
5. ^ Popa, K.; Konings, R.J.M. (2006). "High-temperature heat capacities of EuPO₄ and SmPO₄ synthetic monazites". Thermochimica Acta. 445 (1). Elsevier BV: 49–52. doi:10.1016/j.tca.2006.03.023. ISSN 0040-6031.
6. ^ Gavrichev, 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. ISSN 0036-0244. S2CID 98200684.
7. 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. ISSN 0044-2313. S2CID 104565178.
8. Lacomba-Perales, R.; Errandonea, D.; Meng, Y.; Bettinelli, M. (2010-02-24). "High-pressure stability and compressibility of A PO 4 ( A = La , Nd, Eu, Gd, Er, and Y) orthophosphates: An x-ray diffraction study using synchrotron radiation". Physical Review B. 81 (6): 064113. arXiv:0911.5669. doi:10.1103/PhysRevB.81.064113. ISSN 1098-0121. S2CID 119249866.

• Europium(III) compounds
• Phosphates