ESR studies of europium ions in alkali chlorides and bromides
ESR studies of europium ions in alkali chlorides and bromides
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碱金属氯化物和溴化物中铕离子的 ESR 研究
DOI：
10.1016/0022-3697(78)90036-7
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
R. Nakata
中科院分区：
文献类型：
--
作者：
M. Sumita;K. Kawano;R. Nakata
在室温和液氮温度下对铕离子在碱金属氯化物和溴化物中的ESR进行了研究。首次报道了NaBr：Eu ~（2+）和RbBr：Eu ~（2+）晶体的自旋哈密顿参数，以及NaCl、KCl、KBr和RbBr晶体中凝聚态铕离子的自旋哈密顿参数。讨论了b20和b22与基质晶体晶格常数a的关系，得到了单一的关系式b20 αa− 2.6，而b22的关系式则分别针对Na、K和Rb卤化物系列进行处理。由b22和b20的相对值估算了Eu ~（2+）-空位对周围最近邻阴离子的位移，NaCl和NaBr为0.083a，KCl为0.081a，KBr为0.080a，RbCl为0.074a，RbBr为0.078a。
ESR studies of europium ions in alkali chlorides and bromides were performed at room and liquid nitrogen temperatures. There were first reported spin Hamiltonian parameters for NaBr: Eu2+and RbBr: Eu2+crystals and also for coagulated europium ions in NaCl, KCl, KBr and RbBr crystals. The dependence ofb20andb22on the lattice constant,a, of host crystals was discussed; a single relationb20αa−2.6was obtained, while relations forb22were treated seperately for Na, K and Rb halide series, respectively. From the relative values ofb22andb20, displacements of the nearest neighbor anions surrounding the Eu2+-vacancy pair were estimated to be 0.083afor NaCl and NaBr, 0.081afor KC1, 0.080afor KBr, 0.074afor RbCl and 0.078afor RbBr.