Infrared and microwave dielectric response of the disordered antiferroelectric Ag(Ta,Nb)O3 system

Recent progress related to the investigation of infrared and microwave properties of the AgNbO 3 and AgTaO 3 single crystals and Ag(Ta,Nb)O 3 ceramics is reviewed and discussed with the aid of new crystallographic considerations and symmetry approach. It is shown that optical phonons at any temperat...

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Bibliographic Details
Published inFerroelectrics Vol. 223; no. 1; pp. 235 - 246
Main Authors Petzelt, Jan, Kamba, Stanislav, Buixaderas, Elena, Bovtun, Viktor, Zikmund, ZdeněK, Kania, Antoni, Koukal, Vlastimil, Pokorn, Jan, Polívka, Jirí, Pashkov, Valeri, Komandin, Gennadi, Volkov, Aleksandr
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.03.1999
Subjects
dielectric dispersion
disordered antiferroelectrics
infrared response
microwave ceramics
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Summary:Recent progress related to the investigation of infrared and microwave properties of the AgNbO 3 and AgTaO 3 single crystals and Ag(Ta,Nb)O 3 ceramics is reviewed and discussed with the aid of new crystallographic considerations and symmetry approach. It is shown that optical phonons at any temperature contribute to the permittivity by about 100-200 only and the pronounced dielectric anomalies are due to a submillimetre overdamped excitation related to strong anharmonicities in Nb vibrations (Nb disorder). The best microwave properties near room temperature are achieved for the AgTa 0.57 Nb 0.43 O 3 ceramic for which the permittivity ε = 380 and the quality = 550 at 1.586 GHz with the permittivity temperature coefficient αε passing through zero at 20°C
ISSN:0015-0193
1563-5112
DOI:10.1080/00150199908260576