Dielectric properties of the "Twinned" 8H-Hexagonal Perovskite Ba8Nb4Ti3O24

RAWAL, Ritesh, FETEIRA, Antonio, FLORES, Alberto Arenas, HYATT, Neil C., WEST, Anthony R., SINCLAIR, Derek C., SARMA, Kumaravinothan and ALFORD, Neil McN. (2006). Dielectric properties of the "Twinned" 8H-Hexagonal Perovskite Ba8Nb4Ti3O24. Journal of the American Ceramic Society, 89 (1), 336-339.

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Abstract

The dielectric properties of dense ceramics of the "twinned" 8H-hexagonal perovskite Ba8Nb4Ti3O24 are reported. Single-phase powders were obtained from the mixed-oxide route at 1325 degrees C and ceramics (> 92% of the theoretical X-ray density) by sintering in air or flowing 02 at 1400 degrees-1450 degrees C. The ceramics are dc insulators with a band gap > 3.4 eV that resonate at microwave frequencies with relative permittivity, epsilon(r) similar to 44-48, quality factor, Q x f(r) similar to 21000-23500 GHz (at f(r) similar to 5.5 GHz) and temperature coefficient of resonant frequency, TCf similar to + 115 ppm/K.

Item Type:	Article
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number:	10.1111/j.1551-2916.2005.00665.x
Depositing User:	Hilary Ridgway
Date Deposited:	07 Jun 2012 09:56
Last Modified:	07 Jun 2012 09:56
URI:	http://shura.shu.ac.uk/id/eprint/5344

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