Chemistry:Europium(III) phosphate
 
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3D model (JSmol)
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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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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 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
- ↑ Macintyre, J. E.; Chapman and Hall (1992). Dictionary of inorganic compounds. London: Chapman & Hall. p. 3124. ISBN 0-412-30120-2. OCLC 26338506. https://archive.org/details/dictionaryofinor0004unse.
- ↑ 2.0 2.1 2.2 Ni, Yunxiang; Hughes, John M.; Mariano, Anthony N. (1995-02-01). "Crystal chemistry of the monazite and xenotime structures". American Mineralogist (Mineralogical Society of America) 80 (1–2): 21–26. doi:10.2138/am-1995-1-203. ISSN 0003-004X. Bibcode: 1995AmMin..80...21N.
- ↑ "Europium Phosphate – ProChem, Inc." (in en-US). https://prochemonline.com/product/europiumphosphate-1792/.
- ↑ 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.
- ↑ 5.0 5.1 5.2 Popa, K.; Konings, R.J.M. (2006). "High-temperature heat capacities of EuPO4 and SmPO4 synthetic monazites". Thermochimica Acta (Elsevier BV) 445 (1): 49–52. doi:10.1016/j.tca.2006.03.023. ISSN 0040-6031.
- ↑ 6.0 6.1 6.2 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 (Pleiades Publishing Ltd) 83 (6): 901–906. doi:10.1134/s0036024409060053. ISSN 0036-0244. Bibcode: 2009RJPCA..83..901G.
- ↑ 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 (Wiley) 644 (22): 1403–1414. doi:10.1002/zaac.201800193. ISSN 0044-2313.
- ↑ 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" (in en). Physical Review B 81 (6): 064113. doi:10.1103/PhysRevB.81.064113. ISSN 1098-0121. https://link.aps.org/doi/10.1103/PhysRevB.81.064113.
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