| Autor: |
Rawal, Ritesh, Feteira, Antonio, Flores, Alberto Arenas, Hyatt, Neil C., West, Anthony R., Sinclair, Derek C., Sarma, Kumaravinothan, Alford, Neil McN. |
| Předmět: |
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| Zdroj: |
Journal of the American Ceramic Society; Jan2006, Vol. 89 Issue 1, p336-339, 4p, 1 Black and White Photograph, 1 Diagram, 1 Chart, 2 Graphs |
| Abstrakt: |
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°C and ceramics (>92% of the theoretical X-ray density) by sintering in air or flowing O2 at 1400°–1450°C. The ceramics are dc insulators with a band gap >3.4 eV that resonate at microwave frequencies with relative permittivity, ℇr∼44–48, quality factor, Q × fr∼21 000–23 500 GHz (at fr∼5.5 GHz) and temperature coefficient of resonant frequency, TCf,∼+115 ppm/K. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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