Petzelt, Jan ; Nuzhnyy, Dmitry ; Bovtun, Viktor ; Paściak, Marek ; Kamba, Stanislav ; Dittmer, Robert ; Svirskas, Šarunas ; Banys, Juras ; Rödel, Jürgen (2014)
Peculiar Bi-ion dynamics in Na1/2Bi1/2TiO3from terahertz and microwave dielectric spectroscopy.
In: Phase Transitions, 87 (10-11)
doi: 10.1080/01411594.2014.953517
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Dynamics of the main dielectric anomaly in Na1/2Bi1/2TiO3 (NBT) were studied by time-domain THz and microwave spectroscopy, using also previously published data and their new overall fits. Above the dielectric maximum temperature Tm ≈ 600 K, the response consists of coupled sub-THz oscillator and a relaxation mode, assigned to strongly anharmonic Bi-ion vibrations and hopping, whose slowing down explains the paraelectric-like permittivity increase to Tm. Below Tm, the main relaxation continues slowing down and additional relaxation, assigned to quasi-Debye losses, appears in the 1011 Hz range. The oscillator hardens on cooling and takes over the whole oscillator strength. The permittivity decrease below Tm is caused by the reduced strength of the relaxations due to dominance of the rhombohedral phase within the coexistence region with the tetragonal phase. The anharmonic dynamics of Bi are supported by previous structural studies. NBT represents a hybrid between standard and relaxor ferroelectric behaviour.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Petzelt, Jan ; Nuzhnyy, Dmitry ; Bovtun, Viktor ; Paściak, Marek ; Kamba, Stanislav ; Dittmer, Robert ; Svirskas, Šarunas ; Banys, Juras ; Rödel, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Peculiar Bi-ion dynamics in Na1/2Bi1/2TiO3from terahertz and microwave dielectric spectroscopy |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2014 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Phase Transitions |
| Jahrgang/Volume einer Zeitschrift: | 87 |
| (Heft-)Nummer: | 10-11 |
| DOI: | 10.1080/01411594.2014.953517 |
| Kurzbeschreibung (Abstract): | Dynamics of the main dielectric anomaly in Na1/2Bi1/2TiO3 (NBT) were studied by time-domain THz and microwave spectroscopy, using also previously published data and their new overall fits. Above the dielectric maximum temperature Tm ≈ 600 K, the response consists of coupled sub-THz oscillator and a relaxation mode, assigned to strongly anharmonic Bi-ion vibrations and hopping, whose slowing down explains the paraelectric-like permittivity increase to Tm. Below Tm, the main relaxation continues slowing down and additional relaxation, assigned to quasi-Debye losses, appears in the 1011 Hz range. The oscillator hardens on cooling and takes over the whole oscillator strength. The permittivity decrease below Tm is caused by the reduced strength of the relaxations due to dominance of the rhombohedral phase within the coexistence region with the tetragonal phase. The anharmonic dynamics of Bi are supported by previous structural studies. NBT represents a hybrid between standard and relaxor ferroelectric behaviour. |
| Freie Schlagworte: | sodium bismuth titanate, terahertz spectroscopy, broadband dielectric spectroscopy, phase-transition dynamics, Bi-ion dynamics |
| Zusätzliche Informationen: | SFB 595 A1 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese > Teilprojekt A1: Herstellung keramischer, texturierter Akuatoren mit hoher Dehnung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung 11 Fachbereich Material- und Geowissenschaften Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 12 Dez 2014 08:48 |
| Letzte Änderung: | 12 Dez 2014 08:48 |
| PPN: | |
| Sponsoren: | The research was supported by the Czech Science Foundation (project 13-15110S). R. Dittmer acknowledges support from the German Research Foundation DFG within the collaborative research centre SFB595. |
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