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]
 
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.033.532 |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| EuO4P | |
| Molar mass | 246.934 g·mol−1 |
| Appearance | colourless solid[1] |
| Density | 5.81 g·cm−3 [2] |
| Melting point | 2,200 °C (3,990 °F; 2,470 K)[4] |
| insoluble[3] | |
| Structure[2] | |
| Monazite | |
| P21/n (No. 14) | |
a = 668.13(10), b = 686.18(9), c = 634.91(8) pm α = 90°, β = 103.96(1)°, γ = 90°
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| Thermochemistry | |
Heat capacity (C)
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111.5 J/mol·K[5][6] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
editEuropium 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
editEuropium(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.[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]
References
edit- ^ Macintyre, J. E.; Chapman and Hall (1992). Dictionary of inorganic compounds. London: Chapman & Hall. p. 3124. ISBN 0-412-30120-2. OCLC 26338506.
- ^ a b c 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.
- ^ "Europium Phosphate – ProChem, Inc". prochemonline.com. Archived from the original on 2021-06-22. Retrieved 2022-06-08.
- ^ 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) - ^ a b c 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.
- ^ a b c 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.
- ^ 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.
- ^ 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.