Chemistry:Samarium(III) molybdate
 File:Sm3+.svgFile:3.svg
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| Identifiers | |
|---|---|
| Properties | |
| Sm2(MoO4)3 | |
| insoluble | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Samarium(III) molybdate is an inorganic compound, with the chemical formula Sm2(MoO4)3. It is one of the compounds formed by the three elements samarium, molybdenum and oxygen.
Preparation
Samarium(III) molybdate can be obtained by reacting samarium(III) nitrate and sodium molybdate in the pH range of 5.5~6.0.[1] Its single crystal can be grown at 1085 °C by the Czochralski method.[2]
Samarium(III) molybdate can also be prepared by reacting samarium and molybdenum(VI) oxide:
- [math]\displaystyle{ \mathsf{ Sm_2O_3 + 3MoO_3 \ \xrightarrow{800^oC}\ Sm_2(MoO_4)_3 } }[/math]
Properties
Samarium(III) molybdate forms violet crystals of several modifications:
- orthorhombic crystal system, space group P ba2, unit cell parameters a = 1.04393 nm, b = 1.04794 nm, c = 1.07734 nm, Z = 4, exists at temperatures below 193°C.
- monoclinic crystal system, exists at temperatures above 193°C.[3][4]
Samarium(III) molybdate exhibits ferroelectric properties.[5] It forms a crystalline hydrate with the composition Sm2(MoO4)3•2H2O.
Samarium(III) molybdate can be reduced to the tetravalent molybdenum compound Sm2Mo3O9 by hydrogen at 500~650 °C.[6]
References
- ↑ C. M. Gupta, M. P. Joshi (May 1968). "Investigations on Polymolybdates of Rare Earths. Electrometric Studies on the Compositions of Samarium Polymolybdate" (in en). Bulletin of the Chemical Society of Japan 41 (5): 1268–1270. doi:10.1246/bcsj.41.1268. ISSN 0009-2673.
- ↑ Son, Jong Yoon; Lee, Sudae; Ahn, HyungJoo; Moon, Junkyu; Lee, Chanku; Jeon, Hyoseo; Lee, Hung-Bok. Behavior of ferroelastic domains in Sm2(MoO4)3 crystals(in Korean). Sae Mulli, 2001. 43 (1): 30-35. ISSN 0374-4914.
- ↑ Adachi, M.; Akishige, Y.; Asahi, T.; Deguchi, K.; Gesi, K.; Hasebe, K.; Hikita, T.; Ikeda, T. et al. (2002), "Sm2(MoO4)3 [F, 17A-1"] (in en), Oxides, Landolt-Börnstein - Group III Condensed Matter (Berlin/Heidelberg: Springer-Verlag) 36A2: pp. 1–9, doi:10.1007/10857522_23, ISBN 3-540-42882-8, https://dx.doi.org/10.1007/10857522_23, retrieved 2024-01-11
- ↑ Roy, M.; Choudhary, R. N. P.; Acharya, H. N. (1987-10-01). "X-ray and dielectric studies of Sm2(MoO4)3" (in en). Pramana 29 (4): 419–422. doi:10.1007/BF02845780. ISSN 0973-7111. https://doi.org/10.1007/BF02845780.
- ↑ Ponomarev, B. K.; Red’kin, B. S.; Stiep, E.; Wiegelmann, H.; Jansen, A. G. M.; Wyder, P. (2002-01-01). "Magnetoelectric effect in samarium molybdate" (in en). Physics of the Solid State 44 (1): 145–148. doi:10.1134/1.1434495. ISSN 1090-6460. Bibcode: 2002PhSS...44..145P. https://doi.org/10.1134/1.1434495.
- ↑ 史发年, 任玉芳, 孟建. Ln2Mo3O9的制备、结构及电磁性质. 应用化学, 1995. 2: 95-97.
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