R .D. Shannon, M.A. Subramanian
Central Researach and Development Department
E.I. Du Pont de Nemours and Co., Experimental Station
Wilmington, Delzaware 19880-0356, USA
T. H. Allik
Science Applicatins International Corporation
1710 Goodridge Drive, P.O. Box 1303
McLean, Virginia 22102
H. Kimura
National Research Institute for Metals
1-2-1 Sengen, Tsukuba, Ibaraki 305, Japan
M.R. Kokta
Union Carbide Corp.
750 So. 32nd Street, P.O. Box 6381
Washougal, Washington 98671, USA
M.H. Randles
Litton Airtron
P.O. Box 410168, Charlotte, North Carolina 28421-0168, USA
G.R. Rossman
Dividion of Geological and Planetary Sciences
California Institute of Technology
Pasadena, California, 91125-2500, USA
The dielectric constants (k¢ ) 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:
| Compound | k¢ | Compound | k¢ | |
| (Dy3A15O12) | 11.07 ± 0.05 | (Ho3Ga5O12) | 12.38 ± 0.05 | |
| (Dy3Ga5O12) | 12.36 ± 0.06 | (Th3Ga5O12) | 12.40 ± 0.03 | |
| (Gd3Ga5O12) | 12.18 ± 0.10 | (Eu3Ga5O12) | 12.46 ± 0.05 | |
| (Sm3Ga5O12) | 12.55 ± 0.03 | (Nd3Ga5O12) | 12.59 ± 0.12 | |
| (Y3Sc2Ga3O12) | 12.94 ± 0.03 | (Sm3Sc2Ga3O12) | 13.67 ± 0.04 | |
| (La2.67Lu2.67Ga2.66O12) | 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 aD(mineral) = åaD(oxides) for six aluminum garnets and twelve gallium garnets is ~1%.
Journal of Applied Physics 67, 3798-3802. (1990)