Céramiques de Pb2(K1-xLax/3)Nb5O15: propriétés ferroélectriques et comportement des relaxations en hyperfréquence
✍ Scribed by Zhigao Lu; Jean-Pierre Bonnet; Jean Ravez; Paul Hagenmuller
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 359 KB
- Volume
- 105
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Ferroelectric ceramics of (\mathrm{Pb}{2}\left(\mathrm{~K}{1-x} \mathrm{La}{x / 3}\right) \mathrm{Nb}{5} \mathrm{O}_{15}(x=0,0.1), and 0.3()) and of tetragonal tungsten bronze (TTB) type have been investigated. The Curie temperatures of those TTB-type materials are weakly dependent on (x). The ferroelectric-paraelectric transition becomes more and more diffuse when (\mathrm{La}^{3+}) content increases. Dielectric measurements in the microwave frequency range have revealed the existence of two relaxations. The first one is probably related to the TTB-type structure and the second results from the cationic distribution disorder. 1993 Academic Press, Inc.