Crystal structure and properties of Al2O3-Cr2O3 solid solutions with different Cr2O3 contents
Crystal structure and properties of Al2O3-Cr2O3 solid solutions with different Cr2O3 contents
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DOI：
10.1016/j.ceramint.2017.08.195
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发表时间：
2018-02
影响因子：
5.2
通讯作者：
Pengda Zhao;Huizhong Zhao;Jun-Ling Yu;Han Zhang;Hongjun Gao;Chen Qi
中科院分区：
文献类型：
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作者：
Pengda Zhao;Huizhong Zhao;Jun-Ling Yu;Han Zhang;Hongjun Gao;Chen Qi
为使Al 2 O3-Cr2 O3固溶体得到更广泛的应用，研究了不同Cr2 O3含量的Al 2 O3-Cr2 O3固溶体的晶体结构和性能。在1650 °C时，Al 2 O3和Cr2 O3在整个组成范围内形成完全的置换固溶体，没有化合物生成。晶格常数a和c均随Cr2 O3含量的增加而线性增加。Cr 3+离子的掺杂导致在c轴方向上更严重的晶格应变。衍射峰的衍射角随Cr2 O3含量的增加呈线性减小。固溶体的理论密度与Cr2 O3含量之间的关系可用二阶多项式拟合。随着Cr2 O3含量的增加，固溶体的线膨胀系数减小。
To enable the comprehensive application of Al2O3-Cr2O3solid solutions, the crystal structures and properties of Al2O3-Cr2O3solid solutions with different Cr2O3contents were studied. It was observed that Al2O3and Cr2O3form a complete substitutional solid solution over the entire composition range at 1650 °C, with no compounds being formed. Lattice parameters “a” and “c” both increase linearly with an increase in the Cr2O3content. The doping of the Cr3+ions causes a more severe lattice strain in the c-axis direction. The diffraction angles of the diffraction peaks decrease in a linear manner with the increase in the Cr2O3content. The relationship between the theoretical density of the solid solution and the Cr2O3content could be fitted using a second-order polynomial. It was also observed that the linear expansion coefficient of the solid solutions decreases with an increase in the Cr2O3content.