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Open AccessArticle

Defects and Lattice Instability in Doped Lead-Based Perovskite Antiferroelectrics: Revisited

Institute of Physics, Univeristy of Silesia, ul. 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
Crystals 2020, 10(6), 501; https://doi.org/10.3390/cryst10060501
Received: 3 May 2020 / Revised: 4 June 2020 / Accepted: 8 June 2020 / Published: 12 June 2020
(This article belongs to the Special Issue Electronic Phenomena of Transition Metal Oxides)
This paper is a summary of earlier results that have been completed with recent investigations on the nature and sequence of phase transitions evolving in the antiferroelectric PbZrO3 single crystals doped with niobium and Pb(Zr0.70Ti0.30)O3 ceramics doped with different concentration of Bi2O3. It was found that these crystals undergo new phase transitions never observed before. To investigate all phase transitions, different experimental methods were used to characterize the crystal properties. Temperature and time dependencies have been tentatively measured in a wide range, including a region above Tc, where precursor dynamics is observed in the form of non-centrosymmetric regions existing locally in crystal lattices. Also, coexistence of antiferroelectric phase and one of the intermediate phases could be observed in a wide temperature range. The phase transition mechanism in PbZrO3 is discussed, taking into account the local breaking of the crystal symmetry above Tc and the defects of crystal lattices, i.e., those generated during crystal growth, and intentionally introduced by preheating in a vacuum or doping with hetero-valent dopant. View Full-Text
Keywords: lead zirconate; phase transitions; defects lead zirconate; phase transitions; defects
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Kajewski, D. Defects and Lattice Instability in Doped Lead-Based Perovskite Antiferroelectrics: Revisited. Crystals 2020, 10, 501.

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