KEEBLE, Dean S.; BENABDALLAH, Feres; THOMAS, Pam A.; MAGLIONE, Mario; KREISEL, Jens

doi:10.1063/1.4793400

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KEEBLE, Dean S.
Department of Physics

BENABDALLAH, Feres
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

THOMAS, Pam A.
Department of Physics

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Ce document a été publié dans

Applied Physics Letters. 2013, vol. 102, n° 9, p. 092903 (5 p.)

American Institute of Physics

Résumé en anglais

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.< Réduire

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Barium compounds

Calcium compounds

Critical points

Phase diagrams

Piezoceramics

Solid-state phase transformations

X-ray diffraction

Zirconium compounds

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

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