Studies of the Local Phase-transition Behaviour for Ni+ -II Centers in RbCaF3 Crystal from EPR Data
Studies of the Local Phase-transition Behaviour for Ni+ -II Centers in RbCaF3 Crystal from EPR Data
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DOI：
10.1515/zna-2000-11-1215
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发表时间：
2000-12
期刊：
影响因子：
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通讯作者：
W. Zheng;Shao-yi Wu
中科院分区：
文献类型：
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作者：
W. Zheng;Shao-yi Wu
通过拟合计算得到的EPR gi（i = x，y，z）因子，得到了表征ABX 3钙钛矿结构中Ni ~+- II中心在从α → β相变过程中杂质-配体键沿着旋转轴的释放（或伸长）效应的局域释放因子kl。结果表明，与局域转角（或序参量）Φ类似，局域释放因子与基质晶体的不同。这表明，在掺杂晶体中，杂质可以影响杂质离子附近的局域相变行为。
By fitting the calculated EPR gi(i = x, y, z) factors to the observed values, the local release factor kl which is introduced to characterize the release (or elongation) effect of impurity-ligand bonds along the rotational axis in the cubic-to-tetragonal phase transition of ABX3 perovskites, is obtained for the Ni+- II center in RbCaF3 crystal. The result shows that, similar to the local rotational angle (or order parameter) Φ, the local release factor is unlike that of the host crystal. It suggests that in the doped crystal the impurity can affect the local phase transition behaviour in the vicinity of impurity ions.