Ring Silicates Cs4Tm2[Si4O12](OH)2 and Cs4(Tm,Tb)2[Si4O12](OH)2 As Merohedral Twins

被引:0
|
作者
Bolotina, N. B. [1 ]
Topnikova, A. P. [2 ]
Belokoneva, E. L. [2 ]
Dimitrova, O. V. [2 ]
Volkov, A. S. [2 ]
Zorina, L. V. [3 ]
机构
[1] Russian Acad Sci, Shubnikov Inst Crystallog, Fed Sci Res Ctr Crystallog & Photon, Moscow 119333, Russia
[2] Moscow MV Lomonosov State Univ, Moscow 119991, Russia
[3] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow Oblast, Russia
关键词
CRYSTAL-GROWTH; RE; TB; GD; DY; TEMPERATURE; MELILITE; CHAINS; LAYER; TM;
D O I
10.1134/S1063774523010054
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
New ring silicates Cs4Tm2[Si4O12](OH)(2) and Cs-4(Tm,Tb)(2)[Si4O12](OH)(2) have been synthesized by the hydrothermal method. A structural analogy is revealed between them and the previously studied silicates K4Sc2(OH)(2)(Si4O12) and K2Sc[Si2O6]F. Their crystal structures are identified as orthorhombic merohedral twins by the lost element of tetragonal symmetry. The structures of new ring silicates are related to those of fresnoite and tetragonal melilite.
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页码:24 / 30
页数:7
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