MINERAL DIELECTRIC CONSTANTS AND THE OXIDE ADDITIVITY RULE

R. D. Shannon, M. A. Subramanian
Central Res. Dept., Experimental Station, E. I. Du Pont de Nemours i Co.,
Inc., Wilmington, DE 10880-0356 Contrib. No. 5108

A. N. Mariano
48 Page Brook Rd., Carlisle, MA 01741

G. R. Rossman
Div. Geol. Planetary Sci., Calif. Inst. Tech., Pasadena, CA 01125

ABSTRACT

The 1 KHz dielectric constants of a variety of synthetic aluminate garnets: Y₃Al₂O₁₂ , Ho₃Al₅O₁₂ , Y₂.₉₃Nd_.07Sc₂Al₃O₁₂ and Gd_2.95Nd_0.05Sc_1.98Cr_0.02Al₃O₂ and several silicates: CaB₂Si₂O₅ (danburite), Ca₃A1₂Si₃O₁₂ (grossular) and Mg₂A1₄Si₅O₁₈ (cordierite) were determined using the two-terminal method with edge corrections. These data and polarizabilities derived from the published single crystal dielectric constants of simple oxides were used to compare compound polarizabilities obtained from the Clausius-Mosotti equation and the oxide additivity rule.

Mat. Ras. Soc. Symp. Proc. Vol. 150.