| Zr(WMo)1-x/2VxO8-x/2：多元素同/低价取代立方ZrW2O8结构类型热收缩固溶体的合成、结构与性质 |
| Zr(WMo)1-x/2VxO8-x/2: Synthesis, Structure and Properties of Thermal Contracting Solid Solutions Substituted by Multi-elements with Different Valences in ZrW2O8 Type Structure |
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| 摘要: 利用酸蒸气水热法合成了Zr(WMo)1-x/2VxO7-x/2(OH)2·2H2O(x=0.04,0.08,0.10,0.14,0.20,0.22,0.26,0.32)四方晶相固溶体。以此为前驱体，通过高温脱水和相转变法合成了立方相Zr(WMo)1-x/2VxO8-x/2(x=0.04,0.08,0.10,0.14,0.20,0.22)固溶体。立方Zr(WMo)1-x/2VxO8-x/2固溶体具有Pa3 空间群。Zr(WMo)1-x/2VxO8-x/2的平均晶体结构描述为按照化学计量的ZrV2O7结构与β-ZrWMoO8结构的叠加。ZrV2O7在立方ZrWMoO8中的固溶度为11mol%；立方Zr(WMo)1-x/2VxO8-x/2固溶体的相变温度低于200 K；在200 K~573 K温度范围内具有负热膨胀系数；线热膨胀系数近似为常数。 |
| 关键词: 热收缩性质 晶体结构 Zr(WMo)1-x/2VxO8-x/2 固溶度 |
| 基金项目: |
| Abstract: The tetragonal precursors, Zr(WMo)1-x/2VxO7-x/2(OH)2·2H2O (x=0.04, 0.08, 0.10, 0.14, 0.20, 0.22, 0.26, 0.32) were synthesized by acidic steam hydrothermal (ASH) method, and then the cubic Zr(WMo)1-x/2VxO8-x/2(x=0.04, 0.08, 0.10, 0.14, 0.20, 0.22) was prepared from the precursors by high-temperature dehydration and phase transition method. The cubic Zr(WMo)1-x/2VxO8-x/2 possesses the space group Pa3 and the average crystal structures are described stoichiometrically as the superposition of ZrV2O7 and β-ZrWMoO8 structures with a limited solubility of ZrV2O7 of 11mol% in cubic ZrWMoO8. The cubic Zr(WMo)1-x/2VxO8-x/2 also possesses thermal contraction property at the temperature range of 200~573 K and the linear thermal expansion coefficients are almost the same in the above temperature range. The phase transition temperature for Zr(WMo)1-x/2VxO8-x/2 is lower than 200 K. |
| Keywords: thermal contraction property crystal structure Zr(WMo)1-x/2VxO8-x/2 solid solubility |
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| 马 辉,郭富丽,董丽娜,邓学彬,赵新华.Zr(WMo)1-x/2VxO8-x/2：多元素同/低价取代立方ZrW2O8结构类型热收缩固溶体的合成、结构与性质[J].无机化学学报,2012,28(10):2083-2090. |
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