Infrared and microwave dielectric response of the disordered antiferroelectric Ag(Ta,Nb)O3system
| Autor: | Viktor Bovtun, Jan Pokorn, Valeri Pashkov, Jan Petzelt, Vlastimil Koukal, Antoni Kania, Z. Zikmund, Jirí Polívka, Gennadi Komandin, Elena Buixaderas, Stanislav Kamba, Aleksandr Volkov |
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| Rok vydání: | 1999 |
| Předmět: |
Permittivity
Materials science Condensed matter physics Phonon Infrared Physics::Optics Dielectric Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science visual_art visual_art.visual_art_medium Antiferroelectricity Ceramic Temperature coefficient Microwave |
| Zdroj: | Ferroelectrics. 223:235-246 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150199908260576 |
| Popis: | Recent progress related to the investigation of infrared and microwave properties of the AgNbO3 and AgTaO3 single crystals and Ag(Ta,Nb)O3 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 AgTa0.57Nb0.43O3 ceramic for which the permittivity e = 380 and the quality = 550 at 1.586 GHz with the permittivity temperature coefficient αe passing through zero at 20°C |
| Databáze: | OpenAIRE |
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