电负性
离子半径
双金属片
金属
材料科学
氢气储存
多面体
离子键合
热力学
化学稳定性
化学物理
正式收费
离子势
热稳定性
标准生成焓
焓
物理化学
离子
化学
化学键
物理
复合材料
有机化学
冶金
数学
几何学
合金
作者
Piotr Błoński,Zbigniew Łodziana
标识
DOI:10.1103/physrevb.90.054114
摘要
Metal borohydrides are intensively studied because of their potential applications as versatile hydrogen storage. The relation between the formation enthalpy and the Pauling electronegativity established for these materials [Phys. Rev. B 74, 045126 (2006)] led to the idea of developing mixed-cation compounds that may provide a route for tuning the thermodynamic stability of metal borohydrides. We report a systematic ab initio investigation of the single-metallic and bimetallic borohydrides, and via an examination of the Born effective charges we provide insight into the physical mechanism determining their stabilities. We show that the decreasing stability of metal borohydrides follows the increasing polarizing ability of the cationic bonding component, expressed as the square root of the cation's dynamical charge divided by its radius in coordinated anion polyhedra around the cation. The charge-to-size ratio thus provides a simple yet physically sound measure of the stabilities of metal borohydrides that can be obtained in relatively simple calculations.
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