X-ray single-crystal structural characterization of MgCr2O4, a post-spinel phase synthesized at 23 GPa and 1600 °C

被引：13
|
作者：
Bindi, Luca [1 ,2 ]
Sirotkina, Ekaterina [3 ]
Bobrov, Andrey V. [3 ]
Irifune, Tetsuo [4 ,5 ]
机构：
[1] Univ Firenze, Dipartimento Sci Terra, I-50121 Florence, Italy
[2] CNR Ist Geosci & Georisorse, Sez Firenze, I-50121 Florence, Italy
[3] Moscow MV Lomonosov State Univ, Geol Fac, Dept Petr, Moscow 119234, Russia
[4] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan
[5] Tokyo Inst Technol, Earth Life Sci Inst, Tokyo 1528550, Japan
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2014年 / 75卷 / 05期
基金：
俄罗斯基础研究基金会;
关键词：
HIGH-PRESSURE; HIGH-TEMPERATURE; PYROPE; MICROANALYSIS; SILICATES; CHEMISTRY; DIAMOND; OXIDES;
D O I：
10.1016/j.jpcs.2014.01.008
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The crystal structure and chemical composition of a crystal of MgCr2O4 post-spinel phase synthesized in the model system Mg3Cr2Si3O12-Mg4Si4O12 at 23 GPa and 1600 degrees C have been investigated. Electron microprobe analysis confirmed the MgCr2O4 stochiometry of the studied phase. The compound was found to crystallize with the orthorhombic calcium-titanate (CaTi2O4) structure type, space group Bbmm, with lattice parameters a=9.468(1), b=9.670(1), c= 2.845(1) angstrom, V=260.5(1) angstrom(3), and Z=4. The structure was refined to R1=0.046 using 286 independent reflections. Magnesium was found to fully occupy the eightfold-coordinated A site (with a mean bond distance of 2.289 angstrom) and Cr the octahedral B site (mean: 1.986 angstrom). The successful synthesis of MgCr2O4 with (CaTi2O4)-type structure and its structural characterization demonstrate the stability of the new post-spinel phase. The absence of MgCr2O4 compounds with spinel structure coexisting with the post-spinel phase in the investigated run is discussed. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：638 / 641
页数：4
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