S-state ions in tetragonal SrFCl
S-state ions in tetragonal SrFCl
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四方 SrFCl 中的 S 态离子
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
H. Hartog
中科院分区：
文献类型：
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作者：
D. Zevenhuijzen;Ja Vanwinsum;H. Hartog
本文报道了室温下掺杂Mn2+、Eu2+和Gd3+离子的SrFCl单晶的EPR实验。结果表明，SrFCl:Mn2+和SrFCl:Eu2+体系的晶体场参数b20比SrFCl:Gd3+体系的晶体场参数b20大一个数量级以上。对于所研究的体系，将b20的实验值与格和计算的理论值进行了比较，发现只有SrFCl:Gd3+的理论值与实验值有合理的一致性。结果表明，在SrFCl:Eu2+和SrFCl:Mn2+体系中，二级晶场参数由杂质沿四方晶轴的位移决定。此外，SrFCl:Mn2+的电荷云重叠可能导致点离子晶格模型的击穿。
EPR experiments on SrFCl single crystals doped with Mn2+, Eu2+ and Gd3+ ions at room temperature are reported. It resulted that the crystal field parameter b20 for SrFCl:Mn2+ and SrFCl:Eu2+ is more than one order of magnitude larger than that of the system SrFCl:Gd3+. For the systems investigated the experimental values of b20 are compared with the theoretical ones, obtained from lattice-sum calculations and it was found that there is reasonable agreement between theory and experiment only for SrFCl:Gd3+. It is suggested that in the systems SrFCl:Eu2+ and SrFCl:Mn2+ the second degree crystal field parameter is determined by a displacement of the impurity along the tetragonal crystal axis. Furthermore, a possible breakdown of the point ion lattice model, resulting from over-lapping charge clouds for SrFCl:Mn2+, is indicated.