Pirc, R. ; Rožič, B. ; Koruza, Jurij ; Malič, Barbara ; Kutnjak, Z. (2015)
Anomalous dielectric and thermal properties of Ba-doped PbZrO3 ceramics.
In: Journal of Physics: Condensed Matter, 27
doi: 10.1088/0953-8984/27/45/455902
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The dielectric and thermal properties of an antiferroelectric (AFE) material characterised by an intermediate ferroelectric (FE) phase between the AFE and paraelectric phase in zero field are studied by means of a generalised Landau–Kittel model of AFEs. A temperature-dependent coupling of the two sublattices is introduced in accordance with the Rae–Dove (RD) model of re-entrant phase transitions. The sublattice polarisation components are calculated as functions of temperature and the applied electric field by minimising numerically the free energy. The calculated dielectric susceptibility shows anomalies at the boundaries of the intermediate FE phase, characteristic for first-order phase transitions. It is shown that this behaviour is in qualitative agreement with the measured dielectric constant in Ba-doped PbZrO3 ceramics.The model also predicts a negative adiabatic electrocaloric temperature change ∆T in a broad temperature range in the AFE phase, in qualitative agreement with experiments. The dipolar heat capacity is also predicted to be negative in the intermediate phase in zero field, in analogy with the results of the RD model.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Pirc, R. ; Rožič, B. ; Koruza, Jurij ; Malič, Barbara ; Kutnjak, Z. |
| Art des Eintrags: | Bibliographie |
| Titel: | Anomalous dielectric and thermal properties of Ba-doped PbZrO3 ceramics |
| Sprache: | Englisch |
| Publikationsjahr: | 22 Oktober 2015 |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Condensed Matter |
| Jahrgang/Volume einer Zeitschrift: | 27 |
| DOI: | 10.1088/0953-8984/27/45/455902 |
| Kurzbeschreibung (Abstract): | The dielectric and thermal properties of an antiferroelectric (AFE) material characterised by an intermediate ferroelectric (FE) phase between the AFE and paraelectric phase in zero field are studied by means of a generalised Landau–Kittel model of AFEs. A temperature-dependent coupling of the two sublattices is introduced in accordance with the Rae–Dove (RD) model of re-entrant phase transitions. The sublattice polarisation components are calculated as functions of temperature and the applied electric field by minimising numerically the free energy. The calculated dielectric susceptibility shows anomalies at the boundaries of the intermediate FE phase, characteristic for first-order phase transitions. It is shown that this behaviour is in qualitative agreement with the measured dielectric constant in Ba-doped PbZrO3 ceramics.The model also predicts a negative adiabatic electrocaloric temperature change ∆T in a broad temperature range in the AFE phase, in qualitative agreement with experiments. The dipolar heat capacity is also predicted to be negative in the intermediate phase in zero field, in analogy with the results of the RD model. |
| Freie Schlagworte: | antiferroelectrics, phase transitions, electrocaloric effect |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe |
| Hinterlegungsdatum: | 23 Okt 2015 09:43 |
| Letzte Änderung: | 08 Dez 2015 16:16 |
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