Cation distribution in the structure of titanium-containing ludwigite

被引：0
|
作者：
A. A. Brovkin
I. V. Rozhdestvenskaya
E. A. Rykova
机构：
[1] Fedorovskii All-Russia Institute of Mineral Resources (VIMS),Faculty of Geology
[2] St. Petersburg State University,Faculty of Physics
[3] Moscow State University,undefined
来源：
Crystallography Reports | 2002年 / 47卷
关键词：
Iron; Titanium; Magnesium; Crystal Structure; Structural Formula;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The crystal structure of natural titanium-containing ludwigite has been refined. The unit-cell parameters are a = 9.260 ± 0.002 Å, b = 12.294± 0.002 Å, c = 3.0236± 0.0005 Å, sp. gr. Pbam, and R = 0.0288. The observed cation distribution over the M1-M4 positions corresponds to the structural formula (Mg0.5)(Mg1.0)(Mg0.338Fe0.1622+)(Fe0.473+Ti0.214+Mg0.152+Al0.103+Fe0.072+(BO3)O2. Highly charged titanium ions in the M4 position are balanced mainly with magnesium and not with divalent iron ions.
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页码：412 / 414
页数：2
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