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Dielectric constants of YVO_4, Fe-, Ge-, and V-containing garnets, the polarizabilities of Fe_2O_3, GeO_2, and V_2O_5, and the oxide additivity rule

Shannon, R. D. and Oswald, R. A. and Allik, T. H. and Damen, J. P. M. and Mateika, D. and Wechsler, B. A. and Rossman, G. R. (1991) Dielectric constants of YVO_4, Fe-, Ge-, and V-containing garnets, the polarizabilities of Fe_2O_3, GeO_2, and V_2O_5, and the oxide additivity rule. Journal of Solid State Chemistry, 95 (2). pp. 313-318. ISSN 0022-4596. doi:10.1016/0022-4596(91)90111-T.

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The dielectric constants and dissipation factors of Y_3Fe-5O_(12) , YVO_4 , NaCa_2Mg_2V_3O_(12), and a variety of Ge garnets were determined at 1 MHz using a two-terminal method and empirically determined edge corrections. The results are: Y_3Fe_5O_(12) K'=15.70 tan δ = 0.0009 Ca_3Ga_2Ge_3O_(12) K'=9.73 tan δ = 0.0007 Ca_(.90) Y_(1.88)Mg_(2.27)Ge_3O_(12) K'=10.35 tan δ = 0.0006 CaY_(1.96)Nd_(.04)Zn_2Ge_3O_(12) K'=11.32 tan δ = 0.0006 Nd_(2.95)Mg_(1.48)ln_(.68)Ga_(1.54)Ge_(1.32)O_(12) K'=11.86 tan δ = 0.0009 NaCa_2Mg_2V3O_(12) K'=10.32 tan δ = 0.0007 YVO_4 K_a'=9.68 tan δ_a = 0.0010 K_c' = 16.59 tan δ_c = 0.0278. The dielectric polarizabilities of Fe_2O_3, GeO_2, and V_2O_5 derived from the dielectric constants of the above compounds are 10.5, 5.5, and 15.8 Å^3, respectively. The agreement between measured dielectric polarizabilities as determined from the Clausius-Mosotti equation and those calculated from the sum of oxide polarizabilities according to α_D(mineral) = Σα_D(oxides) for the above garnets is ~0.5%.

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Rossman, G. R.0000-0002-4571-6884
Additional Information:© 1991 Academic Press, Inc. Received March 19, 1991. We thank L. G. Van Uitert (AT&T) for providing the crystal of Y _3Fe_5O_(12) , L. DeShazer of Solidlite Corp. for the crystal of YVO_4, R. Shiffer for sample preparation, A. Brown (Studsvik Energiteknik AB, Nykoping, Sweden) and C. Foris for obtaining cell dimensions, and P. K. Carpenter and J. T. Armstrong (California Institute of Technology, Pasadena, CA) for microprobe data. This work was supported in part by National Science Foundation Grant EAR-86-18200.
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Caltech Division of Geological and Planetary Sciences5770
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Official Citation:R.D. Shannon, R.A. Oswald, T.H. Allik, J.P.M. Damen, D. Mateika, B.A. Wechsler, G.R. Rossman, Dielectric constants of YVO4, Fe-, Ge-, and V-containing garnets, the polarizabilities of Fe2O3, GeO2, and V2O5, and the oxide additivity rule, Journal of Solid State Chemistry, Volume 95, Issue 2, December 1991, Pages 313-318, ISSN 0022-4596, 10.1016/0022-4596(91)90111-T. (
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Deposited On:16 Apr 2013 16:48
Last Modified:09 Nov 2021 23:32

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