Ba[sub 8]ZnTa[sub 6]O[sub 24]: a high-Q microwave dielectric from a potentially diverse homologous series

Moussa, S. M.; Claridge, J. B.; Rosseinsky, M. J.; Clarke, S.; Ibberson, R. M.; Price, T.; Iddles, D. M.; Sinclair, D. C.
June 2003
Applied Physics Letters;6/23/2003, Vol. 82 Issue 25, p4537
Academic Journal
The ceramic Ba[SUB8]ZnTa[SUB6]O[SUB24] has been synthesized in isolation and its dielectric and crystallographic properties characterized. The material affords excellent dielectric properties, with a high unloaded quality factor Q[SUBu] = 20 800 at 3.28 GHz, high relative permittivity &epsis;[SUBr] = 29 and a temperature coefficient of resonant frequency τ[SUBf] = 29.4 ppm/°C. The crystal structure adopted is complex, comprising mixed cubic and hexagonal perovskite subunits, and contains cation vacancies on the octahedral sites. A second phase with a closely related structure is identified, demonstrating the existence of a family of materials. This structural complexity offers diverse opportunities for substitutions calculated to enhance the figures of merit reported.


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