(Ga,Ge)-Analogue of Tourmaline: Crystal Structure and Composition

被引：8
|
作者：
Pushcharovsky, D. Yu [1 ]
Zubkova, N., V [1 ]
Setkova, T., V [2 ]
Balitskii, V. S. [2 ]
Nekrasov, A. N. [2 ]
Nesterova, V. A. [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Geol Dept, Moscow 119899, Russia
[2] Russian Acad Sci, Inst Expt Mineral, Chernogolovka 142432, Moscow Oblast, Russia
来源：
CRYSTALLOGRAPHY REPORTS | 2020年 / 65卷 / 06期
基金：
俄罗斯基础研究基金会;
关键词：
24;
D O I：
10.1134/S1063774520060279
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Crystals of a (Ga,Ge)-analogue of tourmaline have been synthesized by hydrothermal method in the temperature range of 600-650 degrees C under a pressure of 100 MPa. The composition is analyzed, and the structure of single crystals is determined by X-ray diffraction (XRD) analysis. The rhombohedral-cell parameters are found to be a = 16.0102(4) angstrom, c = 7.18423(19) angstrom, sp. gr. R3m, and Z = 3. The distribution of cations over nonequivalent sites in the structure under study is determined to be as follows: Na-0.57(Al1.20Ga1.20Fe0.602+)(Al4.728Fe1.202+Ti0.072)((Si4.80Ge0.78Al0.42)O-18)(BO3)(3)(OH)(3)(O0.42OH0.58). The results obtained confirm possibility for obtaining Ge-substituted crystals with tourmaline structure, which (by analogy with the Ge-analogue of quartz) exhibit high piezo- and pyroelectric properties.
引用
收藏
页码：849 / 856
页数：8
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