Thermal Expansion of Compounds of Zircon Structure
Thermal Expansion of Compounds of Zircon Structure
复制标题
锆石结构化合物的热膨胀
DOI：
10.1111/j.1151-2916.1990.tb05187.x
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发表时间：
1990
影响因子：
3.9
通讯作者：
R. Roy
中科院分区：
文献类型：
--
作者：
E. Subbarao;D. Agrawal;H. A. McKinstry;Christopher W. Sallese;R. Roy
The thermal expansion behavior of 13 members of ABO{sub 4} compounds of the zircon family is examined in terms of crystal chemical (size, charge, and mass of cations) and crystallographic (a and c) parameters. The systematic trend in the thermal expansion coefficients {alpha}{sub a} and {alpha}{sub c}, with the ionic radii, r{sub A} and R{sub B}, can be explained in terms of the unique arrangement of M-O polyhedra along a and c directions of this lattice. In the zircon structure, edge-sharing ZrO{sub 8} dodecahedra form a chain along the a direction while the chain along the c direction consists of alternate edge-sharing SiO{sub 4} tetrahedra and ZrO{sub 8} triangular dodecahedra. Substitution in the A sites affects a and {alpha}{sub a} more than c and {alpha}{sub c} and the reverse is true for replacements in the B sites. Unequal valencies on the A and B sites affect thermal expansion coefficients, particularly {alpha}{sub c}.
The thermal expansion behavior of 13 members of ABO{sub 4} compounds of the zircon family is examined in terms of crystal chemical (size, charge, and mass of cations) and crystallographic (a and c) parameters. The systematic trend in the thermal expansion coefficients {alpha}{sub a} and {alpha}{sub c}, with the ionic radii, r{sub A} and R{sub B}, can be explained in terms of the unique arrangement of M-O polyhedra along a and c directions of this lattice. In the zircon structure, edge-sharing ZrO{sub 8} dodecahedra form a chain along the a direction while the chain along the c direction consists of alternate edge-sharing SiO{sub 4} tetrahedra and ZrO{sub 8} triangular dodecahedra. Substitution in the A sites affects a and {alpha}{sub a} more than c and {alpha}{sub c} and the reverse is true for replacements in the B sites. Unequal valencies on the A and B sites affect thermal expansion coefficients, particularly {alpha}{sub c}.