Thermal expansion of compounds of zircon structure

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb05187.x· OSTI ID:6071725

Subbarao, E C; Agrawal, D K; McKinstry, H A; Sallese, C W; Roy, R ^[1]

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1. Pennsylvania State Univ., University Park, PA (USA). Materials Research Lab.

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}.

• OSTI ID: 6071725
• Journal Information: Journal of the American Ceramic Society; (USA), Vol. 73:5; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ZIRCONIUM COMPOUNDS
THERMAL EXPANSION
ANISOTROPY
CATIONS
CHEMICAL REACTION KINETICS
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
EDGE DISLOCATIONS
CHARGED PARTICLES
CRYSTAL DEFECTS
DISLOCATIONS
EXPANSION
IONS
KINETICS
LINE DEFECTS
REACTION KINETICS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies