掺Li对SrB4O7的性能有一定的影响.本工作用X射线粉末衍射结构分析方法研究了掺Li的SrB4O7的晶体结构和微结构.空间群为Pmn21，晶胞参数为a=10.741（5）A, b=4.245（1）A，c＝4.437（1）A;掺杂的SrB4O7晶胞参数较纯SrB4O7的略有增大;阐述了产生这种变化的原因.在该晶体结构中，Li进入SrB4O7晶格空隙，成为间隙离子;这种结构有利于提高晶体的非线性光学系数.文中还比较了文献中SrB4O7的晶体结构数据，分析了其中存在的问题.
The doped Li ion has aneffect on both the crystal structure and property of SrB4O7. The crystal structure and microstructure of doped SrB4O7 was studied in detail from X-ray powder diffraction data. Its space group is Pmn21, cell parameters: a=1O.741(5)A, b=4.245(1)A, c=4.437(1)A, a little bigger than those of SrB4O7. Reasons for thesc changes were presented. In the cel1, Li ions occupy part of the vacancy between B-O layers; such a structure can improve the nonlinear optical coefficicnts. The errors of crystal data from references were also analyzed.
参考文献
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