| Zr1-xMxWMoO8-x/2和Zr1-xMxW2O8-x/2固溶体的晶胞参数与晶格畸变的关系(英文) |
| Effect of Lattice Parameters of Zr1-xMxWMoO8-x/2 and Zr1-xMxW2O8-x/2 Solid Solutions on Lattice Distortion |
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| 摘要: 合成了Zr1-xMxWMoO8-x/2(M=Er，Tm，Yb，Sc，In，Ga，Al)和Zr1-xMxW2O8-x/2(M=Eu，Er，Yb，Sc，In，Ga，Al)2个系列的固溶体，前者具有β-ZrW2O8结构类型(简称β相)；后者具有α-ZrW2O8结构类型(简称α相)。建立了相和相的晶胞参数与M3+离子浓度的Vegard方程，测定了上述固溶体的固溶度。讨论了M3+离子的化学性质与Vegard斜率SV的关系。分析了α相的SαA与β相的SβA的关系；揭示了α-Zr1-xMxW2O8-x/2晶格中2[WO4]四面体对的取向有序程度对晶格畸变的贡献。提出上述固溶体的晶胞参数随溶质浓度增加而减小，主要是由于氧空位缺陷相互作用的结果。 |
| 关键词: 固溶体 固溶度 负热膨胀性质 Vegard斜率 |
| 基金项目: |
| Abstract: The Zr1-xMxWMoO8-x/2(M=Er, Tm, Yb, Sc, In, Ga, Al) and Zr1-xMxW2O8-x/2(M=Sc, In, Ga, Al) solid solutions were synthesized. Their XRD patterns show typical structure of β- and α- ZrW2O8, respectively. The lattice parameters α′s for both series of solid solutions are linear functions of the M3+ concentrationM within the limited solubility, and could be described by Vegard equations with the slope of SαM or SβM dependent of the difference in ionic radius and the electro-negativity of the M3+ ion. However, SαM of α-Zr1-xMxW2O8-x/2 appears to be also associated with the partial orientation of 2[WO4] pair. In addition, the contraction of the lattice parameters observed for both series of the solid solutions are possibly caused primarily by the oxygen vacancy defect. |
| Keywords: solid solution solid solubility negative thermal expansion vegard slope |
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| 郭富丽,马 辉,杨晓晶,邓学彬,赵新华.Zr1-xMxWMoO8-x/2和Zr1-xMxW2O8-x/2固溶体的晶胞参数与晶格畸变的关系(英文)[J].无机化学学报,2011,27(10):2061-2065. |
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