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Propensity for spontaneous relaxor-ferroelectric transition in quenched(Na1/2Bi1/2)TiO3-BaTiO3 compositions

K.V., Lalitha and Koruza, Jurij and Rödel, Jürgen (2018):
Propensity for spontaneous relaxor-ferroelectric transition in quenched(Na1/2Bi1/2)TiO3-BaTiO3 compositions.
In: Applied Physics Letters, AIP Publishing, pp. 1-5, 113, (252902), ISSN 00036951, DOI: 10.1063/1.5053989, [Article]

Abstract

Recently, quenching lead-free non-ergodic relaxor Na1/2Bi1/2TiO3-BaTiO3 (NBT-BT) materials has been reported to increase the thermal depolarization temperature and enhance the lattice distortion. Driven by the conjecture that enhanced lattice distortion is typically associated with the onset of ferroelectric order, two non-ergodic relaxor NBT-BT compositions at the morphotropic phase boundary were investigated. As evident from the temperature-dependent permittivity, both compositions exhibit a stabilization of ferroelectric order upon quenching. An increase in the depolarization temperature by 40–60°C is observed. Moreover, the composition with higher tetragonality undergoes a spontaneous relaxor-ferroelectric transition upon quenching. Annealing in oxygen atmosphere is shown to revert back the quenching-induced ferroelectric order to the relaxor state. Published by AIP Publishing.

Item Type: Article
Erschienen: 2018
Creators: K.V., Lalitha and Koruza, Jurij and Rödel, Jürgen
Title: Propensity for spontaneous relaxor-ferroelectric transition in quenched(Na1/2Bi1/2)TiO3-BaTiO3 compositions
Language: English
Abstract:

Recently, quenching lead-free non-ergodic relaxor Na1/2Bi1/2TiO3-BaTiO3 (NBT-BT) materials has been reported to increase the thermal depolarization temperature and enhance the lattice distortion. Driven by the conjecture that enhanced lattice distortion is typically associated with the onset of ferroelectric order, two non-ergodic relaxor NBT-BT compositions at the morphotropic phase boundary were investigated. As evident from the temperature-dependent permittivity, both compositions exhibit a stabilization of ferroelectric order upon quenching. An increase in the depolarization temperature by 40–60°C is observed. Moreover, the composition with higher tetragonality undergoes a spontaneous relaxor-ferroelectric transition upon quenching. Annealing in oxygen atmosphere is shown to revert back the quenching-induced ferroelectric order to the relaxor state. Published by AIP Publishing.

Journal or Publication Title: Applied Physics Letters
Volume: 113
Number: 252902
Publisher: AIP Publishing
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 03 Jan 2019 07:55
DOI: 10.1063/1.5053989
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