Isothermal phase transition and the transition temperature limitation in the lead-free (1-x)Bi0.5Na0.5TiO3-xBaTiO3 system

Most ferroelectric transitions occur ultrafast and are time independent. However, here in (1-x) (Bi0.5Na0.5)TiO3-xBaTiO3, we have found a ferroelectric phase transition induced solely by increasing waiting time at certain temperatures (isothermal phase transition). Through cooling, a unique metastab...

Full description

Saved in:
Bibliographic Details
Published in:Acta materialia 2016-01, Vol.103, p.746-753
Main Authors: Zhang, Dawei, Yao, Yonggang, Fang, Minxia, Luo, Zhengdong, Zhang, Lixue, Li, Linglong, Cui, Jian, Zhou, Zhijian, Bian, Jihong, Ren, Xiaobing, Yang, Yaodong
Format: Article
Language:English
Subjects:
Defects
Ferroelectric materials
Ferroelectricity
Glassy
Isothermal ferroelectric transition
Lead free
Lead-free piezoelectrics
Phase transformations
Piezoelectricity
Temperature-dependent
Transition temperature
Transition temperature limitation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Most ferroelectric transitions occur ultrafast and are time independent. However, here in (1-x) (Bi0.5Na0.5)TiO3-xBaTiO3, we have found a ferroelectric phase transition induced solely by increasing waiting time at certain temperatures (isothermal phase transition). Through cooling, a unique metastable state between a relaxor ferroelectric and a ferroelectric is unveiled, which in essence is initially a short-range ordered glassy state and then can evolve into a long-range ordered ferroelectric state through the isothermal process. It is also found that these isothermal ferroelectric transitions only occur within a specific temperature region with different waiting time needed. These features of isothermal phase transition can be understood by Landau theory analysis with the consideration of random defects as a competition between the thermodynamically favored long-range ordered state and the kinetically frustrated short-range ordered glassy state from random defects. This study offers a precise experimental as well as a phenomenological interpretation on the isothermal ferroelectric transition, which may help to further clarify the intricate structure-property relationship in this important lead-free piezoelectric material and other related systems. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2015.10.037