Spatial correlations in the valence of metal ions in Ni1-xPdx(chxn)2Br3
Spatial correlations in the valence of metal ions in Ni1-xPdx(chxn)2Br3
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Ni1-xPdx(chxn)2Br3 中金属离子价态的空间相关性
DOI：
10.1143/jpsj.68.3948
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发表时间：
1999
影响因子：
1.7
通讯作者：
N. Matsushita
中科院分区：
文献类型：
--
作者：
Y. Wakabayashi;N. Wakabayashi;M. Yamashita;T. Manabe;N. Matsushita
X射线散射实验已进行准一维系统，Ni 1-xPdx（chxn）2Br 3。对于x > 0.7，观察到强的漫散射，并且将其解释为由于金属离子价态的空间不均匀性。这种不均匀性采取CDW的形式，其中链内的金属离子具有在+2和+4之间交替的化合价。在价序列的相关性可以确定平行以及垂直于链方向。对相关函数的测量结果表明，存在很强的相关性之间的位置的桥接溴离子和溴抗衡离子。得出结论，当x <0.7时，金属离子的价态为+3。这些结果与以前的光学和磁性测量数据是一致的。
X-ray scattering experiments have been performed on a quasi-one dimensional system, Ni 1- x Pd x (chxn) 2 Br 3 . Strong diffuse scattering was observed for x > 0.7, and it was interpreted as due to spatial inhomogeneity in the valence of metal ions. This inhomogeneity takes the form of CDW in which the metal ions within a chain have valences alternating between +2 and +4. Correlations in the valence sequence could be determined parallel as well as perpendicular to the chain direction. Pair correlation functions deduced from the measurements show the existence of strong correlation between the positions of bridging Br ions and those of Br counter ions. It is concluded that the valence of metal ions for x <0.7 is +3. These results are consistent with previous data on optical and magnetic measurements.