Light metal borohydrides: crystal structures and beyond

被引：91

作者：

Filinchuk, Yaroslav ^{[1
]}

Chernyshov, Dmitry ^{[1
]}

Dmitriev, Vladimir ^{[1
]}

机构：

[1] ESRF, Swiss Norwegian Beam Lines, F-38043 Grenoble, France

来源：

ZEITSCHRIFT FUR KRISTALLOGRAPHIE | 2008年 / 223卷 / 10期

关键词：

Borohydrides; Structure; Polymorphism; Stability; Synchrotron diffraction;

D O I：

10.1524/zkri.2008.1021

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Experimental structures of M(BH4)(n), where M is a 2(nd)-4(th) period element, are reviewed with a particluar emphasize on crystal chemistry. It is shown that except certain cases, the BH4 group has a nearly ideal tetrahedral geometry. Correction of the experimentally determined H-positions allows to compare directly the results obtained by different diffraction techniques and by theoretical calculations. Analysis of coordination geometries for M and BH4, and of mechanisms of phase transitions in LiBH4, suggests that the directional BH4...M interaction is at the origin of structural complexity of borohydrides. The ways to influence their stability by chemical modification are discussed. Study of structural evolution with temperature and pressure is shown to be the way to access fundamental information on structural stability of these systems.

引用

页码：649 / 659

页数：11

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