Samarium(III) molybdate

Samarium(III) molybdate
Identifiers

CAS Number	15702-43-9^Y
Properties
Chemical formula	Sm₂(MoO₄)₃
Appearance	white solid^[1]
Solubility in water	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.^[2] Its single crystal can be grown at 1085 °C by the Czochralski method.^[3]

Samarium(III) molybdate can also be prepared by reacting samarium and molybdenum(VI) oxide:

{\mathsf {Sm_{2}O_{3}+3MoO_{3}\ {\xrightarrow {800^{o}C}}\ Sm_{2}(MoO_{4})_{3}}}

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.^[4]^[5]

Samarium(III) molybdate exhibits ferroelectric properties.^[6] 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.^[7]

References

^ Q Huang, J Xu, W Li (February 1989). "Preparation of tetragonal defect scheelite-type RE2(MoO4)3 (RE=La TO Ho) by precipitation method". Solid State Ionics. 32–33: 244–249. doi:10.1016/0167-2738(89)90228-2. Archived from the original on 2022-06-18. Retrieved 2022-05-17.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ C. M. Gupta, M. P. Joshi (May 1968). "Investigations on Polymolybdates of Rare Earths. Electrometric Studies on the Compositions of Samarium Polymolybdate". 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.; Iwata, Y. (2002), "Sm2(MoO4)3 [F], 17A-1", Oxides, Landolt-Börnstein - Group III Condensed Matter, Berlin/Heidelberg: Springer-Verlag, vol. 36A2, pp. 1–9, doi:10.1007/10857522_23, ISBN 3-540-42882-8, 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". Pramana. 29 (4): 419–422. doi:10.1007/BF02845780. ISSN 0973-7111. S2CID 119605023.
^ 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". Physics of the Solid State. 44 (1): 145–148. Bibcode:2002PhSS...44..145P. doi:10.1134/1.1434495. ISSN 1090-6460. S2CID 121603541.
^ 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.