| Autor: |
Beltrán, Héctor, Gómez, Beatriz, Masó, Nahum, Cordoncillo, Eloisa, Escribano, Purificación, West, Anthony R. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 4/15/2005, Vol. 97 Issue 8, p084104, 6p, 1 Black and White Photograph, 1 Diagram, 8 Graphs |
| Abstrakt: |
Single phase powders of BaTi2O5 and Ba6Ti17O40 were made by a sol-gel method with final heating at 1100–1200 °C. Ceramic samples were prepared and fired at temperatures in the range 1100–1300 °C. Both sets were highly insulating, with conductivities of, e.g., 10-6–10-7 S cm-1 at 600 °C and activation energies for conduction in the range 1.75–1.86 eV. BaTi2O5 compositions are ferroelectric with a permittivity maximum dependent on firing conditions: [variant_greek_epsilon]max′=122 at 450 °C on firing at 1100 °C; and [variant_greek_epsilon]max′=130 at 475 °C on firing at 1225 °C. Ba6Ti17O40 is a dielectric with [variant_greek_epsilon]′∼57–55 over the range 40–400 °C. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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