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首页> 外文期刊>Physica, B. Condensed Matter >Synthesis, cation distribution and crystal structure of the spinel type solid solution GaxCoFe1-xCrO4 (0 <= x <= 1)
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Synthesis, cation distribution and crystal structure of the spinel type solid solution GaxCoFe1-xCrO4 (0 <= x <= 1)

机译：尖晶石型固溶体GaxCoFe1-xCrO4（0 <= x <= 1）的合成，阳离子分布和晶体结构

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摘要

Solid solutions of GaxCoFe1-xCrO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) were obtained by solid-state reactions in air at 1623 K. X-ray and neutron powder diffraction measurements have been performed on the materials in order to characterize them. Rietveld refinement of neutron powder diffraction data showed cubic symmetry corresponding to the space group Fd3m for all samples of the series. The results reveal that Ga has been substituted for Fe selectively. Ga exclusively occupies the octahedral site up to x = 0.8, while at x = 1.0 a small amount of Ga (5%) enters into the tetrahedral site in the compound. Cr, Fe and Co cations are distributed between the tetrahedral 8a and octahedral 16d sites. Their proportion at each site varies with composition. The fractional coordinates of oxygen are almost the same in all the samples while lattice parameter shows a slight decrease with increasing Ga content. The magnetic structure at room temperature was ferrimagnetic for the composition x = 0.0 and 0.2. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 24]
机译：GaxCoFe1-xCrO4（x = 0.0、0.2、0.4、0.6、0.8、1.0）的固溶体通过在1623 K的空气中进行固态反应获得。按顺序对材料进行了X射线和中子粉末衍射测量表征它们。中子粉末衍射数据的Rietveld改进显示，该系列所有样品的立方对称性对应于空间群Fd3m。结果表明Ga已被选择性地替代了Fe。 Ga仅占据x = 0.8时的八面体位点，而在x = 1.0时，少量Ga（5％）进入化合物的四面体位点。 Cr，Fe和Co阳离子分布在四面体8a和八面体16d之间。它们在每个部位的比例随组成而变化。在所有样品中，氧的分数坐标几乎相同，而晶格参数显示随着Ga含量的增加而略有降低。对于组成x ＝ 0.0和0.2，室温下的磁性结构是亚铁磁性的。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：24]

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