View source for Samarium(III) molybdate

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|   CASNo = 15702-43-9
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|   Formula = Sm<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub>
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|   Appearance = white solid<ref>{{cite journal|journal=Solid State Ionics|volume=32-33|language=en|date=February 1989|pages=244–249|doi=10.1016/0167-2738(89)90228-2|url=https://linkinghub.elsevier.com/retrieve/pii/0167273889902282|title=Preparation of tetragonal defect scheelite-type RE2(MoO4)3 (RE=La TO Ho) by precipitation method|accessdate=2022-05-17|author=Q Huang, J Xu, W Li|archive-date=2022-06-18|archive-url=https://web.archive.org/web/20220618175654/https://linkinghub.elsevier.com/retrieve/pii/0167273889902282}}</ref>
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|   Solubility = insoluble }}
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'''Samarium(III) molybdate''' is an [[inorganic compound]], with the chemical formula Sm<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub>. 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.<ref>{{cite journal|journal=Bulletin of the Chemical Society of Japan|volume=41|issue=5|language=en|issn=0009-2673|date=May 1968|pages=1268–1270|doi=10.1246/bcsj.41.1268|title=Investigations on Polymolybdates of Rare Earths. Electrometric Studies on the Compositions of Samarium Polymolybdate|author=C. M. Gupta, M. P. Joshi|doi-access=free}}</ref> Its single crystal can be grown at 1085&nbsp;°C by the [[Czochralski method]].<ref>Son, Jong Yoon; Lee, Sudae; Ahn, HyungJoo; Moon, Junkyu; Lee, Chanku; Jeon, Hyoseo; Lee, Hung-Bok. Behavior of ferroelastic domains in Sm<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> crystals{{in lang|ko}}. ''Sae Mulli'', 2001. 43 (1): 30-35. {{issn|0374-4914}}.</ref>
Samarium(III) molybdate can also be prepared by reacting samarium and [[molybdenum(VI) oxide]]:
:: <math>\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 ba''2, [[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.<ref>{{Citation |last1=Adachi |first1=M. |title=Sm2(MoO4)3 [F], 17A-1 |url=https://dx.doi.org/10.1007/10857522_23 |work=Oxides |pages=1–9 |access-date=2024-01-11 |place=Berlin/Heidelberg |publisher=Springer-Verlag |language=en |doi=10.1007/10857522_23 |isbn=3-540-42882-8 |last2=Akishige |first2=Y. |last3=Asahi |first3=T. |last4=Deguchi |first4=K. |last5=Gesi |first5=K. |last6=Hasebe |first6=K. |last7=Hikita |first7=T. |last8=Ikeda |first8=T. |last9=Iwata |first9=Y.|series=Landolt-Börnstein - Group III Condensed Matter |date=2002 |volume=36A2 }}</ref><ref>{{Cite journal |last1=Roy |first1=M. |last2=Choudhary |first2=R. N. P. |last3=Acharya |first3=H. N. |date=1987-10-01 |title=X-ray and dielectric studies of Sm2(MoO4)3 |url=https://doi.org/10.1007/BF02845780 |journal=Pramana |language=en |volume=29 |issue=4 |pages=419–422 |doi=10.1007/BF02845780 |s2cid=119605023 |issn=0973-7111}}</ref>
Samarium(III) molybdate exhibits [[ferroelectric]] properties.<ref>{{Cite journal |last1=Ponomarev |first1=B. K. |last2=Red’kin |first2=B. S. |last3=Stiep |first3=E. |last4=Wiegelmann |first4=H. |last5=Jansen |first5=A. G. M. |last6=Wyder |first6=P. |date=2002-01-01 |title=Magnetoelectric effect in samarium molybdate |url=https://doi.org/10.1134/1.1434495 |journal=Physics of the Solid State |language=en |volume=44 |issue=1 |pages=145–148 |doi=10.1134/1.1434495 |bibcode=2002PhSS...44..145P |s2cid=121603541 |issn=1090-6460}}</ref> It forms a crystalline hydrate with the composition Sm<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub>•2H<sub>2</sub>O.
Samarium(III) molybdate can be reduced to the tetravalent molybdenum compound Sm<sub>2</sub>Mo<sub>3</sub>O<sub>9</sub> by [[hydrogen]] at 500~650&nbsp;°C.<ref>史发年, 任玉芳, 孟建. [http://qikan.cqvip.com/Qikan/Article/Detail?id=1940271 Ln<sub>2</sub>Mo<sub>3</sub>O<sub>9</sub>的制备、结构及电磁性质]. 应用化学, 1995. 2: 95-97.</ref>
==References==
{{reflist}}
{{Samarium compounds}}
{{Molybdates}}
[[Category:Samarium(III) compounds]]
[[Category:Molybdates]]