Work

Revised structural phase diagram of (Ba0.7Ca0.3TiO3)-(BaZr0.2Ti0.8O3)

Year: 2013

Type: article

Abstract: The temperature-composition phase diagram of barium calcium titanate zirconate (x(Ba0.7Ca0.3TiO3)-(1 − x)(BaZr0.2Ti0.8O3); BCTZ) has been reinvestigated using high-resolution synchrotron x-ray powder diffraction. Contrary to previous reports of an unusual rhombohedral-tetragonal phase transition in this system, we have observed an intermediate orthorhombic phase, isostructural to that present in the parent phase, BaTiO3, and we identify the previously assigned T-R transition as a T-O transition. We also observe the O-R transition coalescing with the previously observed triple point, forming a phase convergence region. The implication of the orthorhombic phase in reconciling the exceptional piezoelectric properties with the surrounding phase diagram is discussed.

Source: Applied Physics Letters

DOI: 10.1063/1.4793400

Authors: Dean S. Keeble, Feres Benabdallah, Pam A. Thomas, Mario Maglione, Jens Kreisel

Institutions: University of Warwick, Centre National de la Recherche Scientifique, Université de Bordeaux, Institut de Chimie de la Matière Condensée de Bordeaux, Centre de recherche public Gabriel-Lippmann

Language: English

Topic: Ferroelectric and Piezoelectric Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

Funder: University of Warwick

OpenAlex ID: W2018592047