Anomalous X-ray Scattering Study for Determining Cation Distribution in ZnFe2O4 and NiFe2O4.
Anomalous X-ray Scattering Study for Determining Cation Distribution in ZnFe2O4 and NiFe2O4.
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DOI：
10.1515/htmp.2004.23.5-6.357
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发表时间：
2004
影响因子：
1.5
通讯作者：
K. Sugiyama;T. Okamoto;Y. Waseda
中科院分区：
文献类型：
--
作者：
K. Sugiyama;T. Okamoto;Y. Waseda
利用锌、镍和铁的Κ吸收边附近的反常X射线散射方法，测定了锌铁尖晶石和镍铁尖晶石中锌、镍的分布及其在173K以下的温度依赖性。对于本样品，当所有的锌原子都被分配到由四个氧形成的四面体位置时，测量到的接近锌和铁边的两个能量的强度比可以被定量地解释，这表明在II73K以下的热处理可以维持一个几乎完全正常的状态。另一方面，对NiFe204样品的结果表明，Ni2*更倾向于八个氧形成的八面体位置。通过获得元素周期表中近邻元素的铁氧体体系中的阳离子分布，证明了该方法的有效性。S：反常X射线散射、铁氧体、尖晶石、Rietveld、阳离子分布、同步辐射
The distribution of Zn2f or Ni2+ in ferrite spinels of ZnFe204 and NiFe204 and its temperature dependence up to I173K have been determined by applying the anomalous X-ray scattering (AXS) method near the Κ absorption edges of Zn, Ni and Fe. Measured intensity ratio with two energies close to the Zn and Fe edges for the present ZnFe204 sample can be quantitatively explained when all Zn2' are allocated to the tetrahedral position formed by four oxygens, suggesting that an almost perfectly normal state was maintained by the heat treatment up to II73K. On the other hand, the results for NiFe204 sample imply that Ni2* prefers the octahedral position formed by eight oxygens. The usefulness of this AXS method has been wellrecognized by obtaining the cation distribution in such ferrite systems with near neighboring elements in the periodic table. K e y W o r d s : Anomalous X-ray Scattering, Ferrite, Spinel, Rietveld, Cation Distribution, Synchrotron radiation