Synthesis of rare-earth selenate and selenite materials under 'sol-gel' hydrothermal conditions: crystal structures and characterizations of La(HSeO{sub 3})(SeO{sub 4}) and KNd(SeO{sub 4}){sub 2}
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Number 1295, Ding Xi Road, Shanghai, 200050 (China)
Two rare-earth compounds containing selenium atoms, La(HSeO{sub 3})(SeO{sub 4}) with a new open framework structure and KNd(SeO{sub 4}){sub 2} with a layered structure, have been synthesized under ''sol-gel'' hydrothermal conditions for the first time. Single-crystals of La(HSeO{sub 3})(SeO{sub 4}) crystallize in the monoclinic system (P2{sub 1}, a=8.5905(17)A, b=7.2459(14)A, c=9.5691(19)A, {beta}=104.91(3){sup o}, Z=2, RAll=0.032). The structure contains puckered polyhedral layers made of LaO{sub x} (x=9,10) and SeO{sub 4} groups, which are connected via SeO{sub 3}-uints to the 3D structure. The crytal structure of KNd(SeO{sub 4}){sub 2} (monoclinc, P2{sub 1}/c, a=8.7182(17)A, b=7.3225(15)A, c=11.045(2)A, {beta}=91.38(3){sup o}, Z=4, RAll=0.051) contains honeycomb-like six-ring NdO{sub 9} polyhedra forming layers which are further decorated with SeO{sub 4} tetrahedra. The K{sup +} ions occupy the interspaces of these layers and provide the charge balance.
- OSTI ID:
- 20658243
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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