Thermal Expansion of Compounds of Zircon Structure

Autor: E. C. Subbarao, Herbert A. McKinstry, Christopher W. Sallese, Rustum Roy, Dinesh K. Agrawal
Rok vydání: 1990
Předmět:
Zdroj: Journal of the American Ceramic Society. 73:1246-1252
ISSN: 1551-2916
0002-7820
DOI: 10.1111/j.1151-2916.1990.tb05187.x
Popis: 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}.
Databáze: OpenAIRE
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