Document Type

Article

Publication Date

2011

Journal or Book Title

Journal of the American Ceramic Society

Volume

94

Issue

11

First Page

4040

Last Page

4044

DOI

10.1111/j.1551-2916.2011.04670.x

Abstract

The phase transitions in unpoled lead-free (1−x)(Bi1/2Na1/2)TiO3–xBaTiO3 (x = 0.06 and 0.11) ceramics are investigated using hot-stage transmission electron microscopy (TEM). It is found that large ferroelectric domains in both ceramics start to disappear around Td, the depolarization temperature. After the transition, both compositions exhibit the P4bm tetragonal symmetry in the form of nanodomains. The structural transition observed by the in situTEM experiments seems to be gradual and occurs within a temperature range of several tens of degrees, in contrast to the sharp anomaly at Td revealed by the dielectric characterization. With further increasing temperature, no structural change was observed for both compositions across TRE, where the dielectric frequency dispersion vanishes, and Tm, where the dielectric permittivity reaches maximum. The tetragonal-to-cubic transition is diffuse and takes place in a broad temperature window well above both TRE and Tm. These results of structural phase transitions are summarized in a phase diagram with its composition range covering the morphotropic phase boundary (MPB).

Comments

This is the peer reviewed version of the following article: Journal of the American Ceramic Society 94, 4040-4044 (2011). DOI: 10.1111/j.1551-2916.2011.04670.x.

Rights

This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

Copyright Owner

Ma, et al.

Language

en

File Format

application/pdf

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