Frequency dependence of the characteristic temperatures in PbSc0.5Ta0.36Nb0.14O3 relaxor ferroelectrics crystals seen via acoustic emission
PbSc0.5Ta0.36Nb0.14O3 relaxor ferroelectrics crystals were investigated in a wide temperature range of 200–700 K using acoustic emission. The intermediate temperature T* as well as the Burns temperature Td were successfully detected at 480 K and 581 K, respectively. Another acoustic emission burst w...
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Veröffentlicht in: | Journal of applied physics 2014-02, Vol.115 (8) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | PbSc0.5Ta0.36Nb0.14O3 relaxor ferroelectrics crystals were investigated in a wide temperature range of 200–700 K using acoustic emission. The intermediate temperature T* as well as the Burns temperature Td were successfully detected at 480 K and 581 K, respectively. Another acoustic emission burst was detected at Tnl ∼ 211 K, which is below the temperature of the dielectric-permittivity maximum Tm ∼ 257 K but it is accompanied by a slight anomaly in the dielectric permittivity. Tnl is attributed to the low-temperature boundary of an incommensurately modulated antiferroelectric phase transition taking place over a temperature range. All characteristic temperatures exhibit frequency dispersion in the range of 0.1–10 kHz, which is considerably stronger for T* and Td than for Tm and Tnl. In addition, Tnl depends linearly on frequency, whereas both T* and Td resemble the non-linear frequency dependence of Tm typical of relaxors. The nature of the frequency dispersion of T* and Td is discussed from the viewpoint of complex behavior of low-energy polar modes intrinsic of relaxor ferroelectrics. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4864036 |