Revised structural phase diagram of (Ba{sub 0.7}Ca{sub 0.3}TiO{sub 3})-(BaZr{sub 0.2}Ti{sub 0.8}O{sub 3})

Journal Article · Mon Mar 04 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4793400· OSTI ID:22162772

Keeble, Dean S.; Thomas, Pam A. ^[1]; Benabdallah, Feres; Maglione, Mario ^[2]; Kreisel, Jens ^[1]

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1. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
2. ICMCB, Universite de Bordeaux, CNRS, 33600 Pessac (France)

The temperature-composition phase diagram of barium calcium titanate zirconate (x(Ba{sub 0.7}Ca{sub 0.3}TiO{sub 3})-(1 - x)(BaZr{sub 0.2}Ti{sub 0.8}O{sub 3}); 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, BaTiO{sub 3}, 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.

• OSTI ID: 22162772
• Journal Information: Applied Physics Letters, Vol. 102, Issue 9; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CONVERGENCE
ORTHORHOMBIC LATTICES
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PIEZOELECTRICITY
RESOLUTION
SOLIDS
SYNCHROTRONS
TITANATES
TRIGONAL LATTICES
TRIPLE POINT
X-RAY DIFFRACTION
ZIRCONATES
ZIRCONIUM COMPOUNDS