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Dielectric constants of yttrium and rare-earth garnets, the polarizability of gallium oxide, and the oxide additivity rule

Shannon, R. D. and Subramanian, M. A. and Allik, T. H. and Kimura, H. and Kokta, M. R. and Randles, M. H. and Rossman, G. R. (1990) Dielectric constants of yttrium and rare-earth garnets, the polarizability of gallium oxide, and the oxide additivity rule. Journal of Applied Physics, 67 (8). pp. 3798-3802. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:SHAjap90

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Abstract

The dielectric constants (kappa[script ']) and dielectric loss values of 10 rare-earth gallium garnets and 1 rare-earth aluminum garnet were measured at 1 MHz using a two-terminal method with empirically determined edge corrections. The results are: kappa[script '](Dy3Al5O12)=11.07±0.05; kappa[script '](Ho3Ga5O12) =12.38±0.05; kappa[script '](Dy3Ga5O12)=12.36±0.06; kappa[script '](Tb3Ga5O12) =12.40 ±0.03; kappa[script '](Gd3Ga5O12) =12.18±0.10; kappa[script '](Eu3Ga5O12) =12.46±0.05; kappa[script '](Sm3Ga5O12) =12.55±0.03; kappa[script '](Nd3Ga5O12) =12.59±0.12; kappa[script '](Y3Sc2Ga3O12) =12.94±0.03; kappa[script '](Sm3Sc2Ga3O12) =13.67±0.04; and kappa[script '](La2.66Lu2.66Ga2.66O12) =14.40±0.03. The dielectric polarizability of Ga2O3 derived from the dielectric constants of these and other Ga compounds is 8.80±0.14 Å3. The agreement between measured dielectric polarizabilities as determined from the Clausius–Mosotti equation and those calculated from the sum of oxide polarizabilities according to alphaD(mineral) =SigmaalphaD (oxides) for six aluminum garnets and twelve gallium garnets is ~1%.


Item Type:Article
Additional Information:Copyright © 1990 American Institute of Physics (Received 13 November 1989; accepted 9 January 1990) We thank D. Appleman of the Smithsonian Institution for the crystals of Eu3Ga5O12 (USNM 53), Tb3Ga5O12 (USNM 87), and Nd3Ga5O12 (USNM 92), R.W. Shiffer for sample preparation and R.A. Oswald for making capacitance measurements, and A. BRown (Studvik Energiteknik AB, Nykoping, Sweden) and C. Fortis for obtaining cell dimensions of Ho3Al5O12, Y1.5Er1.5Al5O12 and Gd3Sc2Al3O12. This work was supported in part by National Science Foundation Grant No. EAR 86-18200.
Subject Keywords:YTTRIUM COMPOUNDS; RARE EARTH COMPOUNDS; FERRITE GARNETS; DIELECTRIC PROPERTIES; POLARIZABILITY; CLAUSIUS–MOSOTTI EQUATION
Record Number:CaltechAUTHORS:SHAjap90
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SHAjap90
Alternative URL:http://dx.doi.org/10.1063/1.345026
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6357
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:12 Dec 2006
Last Modified:26 Dec 2012 09:20

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