Structural investigations of the tetraborates MB4O7 (M  =  Pb, Sr, Ba)

Structural investigations of the tetraborates MB4O7 (M  =  Pb, Sr, Ba)
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四硼酸盐 MB4O7(M = Pb、Sr、Ba)的结构研究

DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
M. Braden
M. Braden
中科院分区:
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文献类型:
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作者:
W. Stein;J. Liebertz;P. Becker;L. Bohatý;M. Braden

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在室温下研究了 M = Sr、Pb、Ba 的四硼酸盐 MB4O7 的晶体结构,在 100 K 下研究了 M = Pb、Ba 的四硼酸盐 MB4O7 的晶体结构。通过比较同构化合物PbB4O7和SrB4O7,可以研究PbB4O7中Pb2+孤电子对的影响。孤对电子显示出铅原子的明显位移,该位移在冷却时增加。与 Sr 和 Pb 化合物相反,BaB4O7 以中心对称结构结晶。然而,这种结构似乎处于稳定的边缘,因为我们发现了强大的内应力。
The crystal structures of the tetraborates MB4O7 were investigated at room temperature for M  =  Sr, Pb, Ba and at 100 K for M  =  Pb, Ba. The influence of the lone electron pair of Pb2+ in PbB4O7 can be studied by comparing the isostructural compounds PbB4O7 and SrB4O7. The lone pair shows a clear displacement of the lead atom which increases upon cooling. In contrast with the Sr and Pb compounds, BaB4O7 crystallizes in a centrosymmetric structure. However, this structure seems to be on the border of stability, as we find strong internal stress.
DOI: 10.1016/j.solidstatesciences.2008.07.015
发表时间: 2009
影响因子: 3.5
作者:
J.S. Knyrim;S.R. Römer;W. Schnick;H. Huppertz
通讯作者: H. Huppertz