Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43882
Title: Elastic softening near the phase transitions in (1 - X) Bi1/2Na1/2TiO3-xBaTiO3 solid solutions
Authors: Uddin, S
Zheng, GP 
Iqbal, Y
Ubic, R
Chan, NY
Chan, HLW 
Keywords: Lead-free ferroelectrics
Phase transitions
Piezoelectric
Pyroelectric
Soft mode
Issue Date: 2015
Publisher: Institute of Physics Publishing
Source: Materials research express, 2015, v. 1, no. 4, 046102 How to cite?
Journal: Materials research express 
Abstract: Phase transitions in sol-gel-derived (1 - x)(Bi1/2Na1/2TiO3)-xBaTiO3 (0≤x ≤0.06) solid solutions were investigated via dynamic mechanical, dielectric, and ferroelectric analyses. Structural phase transition was observed from both noncentrosymmetric ferroelectric to nonpolar (antiferroelectric) forms (FE-AFE) at temperatures ranging from ∼120 °C to ∼210 °C, and from antiferroelectric to paraelectric forms (AFE-PE) at temperatures ranging from ∼250 °C to ∼320 °C for 0≤x≤0.06. The former transition is accompanied by a significant and broad elastic softening or soft-mode process, and the latter is of typical diffused type. The dynamic mechanical scaling exponent and critical scaling exponent are used to characterize these two phase transitions, respectively. The temperature-dependent polarization showed an abnormal trend unlike other reported ferroelectrics, confirming the presence of two different phases: FE and AFE. The d33 piezoelectric constant increases with increasing x up to the morphotropic phase boundary. It is suggested that the dynamic mechanical scaling exponents could be used to characterize the mobility of the polar domains and the elastic softening processes, which are closely related to abnormal pyroelectric properties and piezoelastic hardening behaviors.
URI: http://hdl.handle.net/10397/43882
ISSN: 2053-1591
DOI: 10.1088/2053-1591/1/4/046102
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