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Title: Phase transitions and the piezoelectricity around morphotropic phase boundary in Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} lead-free solid solution

In this paper, two displacive phase transitions around the morphotropic phase boundary (MPB) in Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} (BZT-xBCT) ceramics were detected by inspecting two anomalies of the Raman Ti{sup 4+}-O{sup 2−} longitudinal optical mode (∼725 cm{sup −1}). Further, permittivity and X-ray diffraction results demonstrated these two phase transitions originate from tetragonal (T) to rhombohedral (R) through an intermediate orthorhombic (O) phase. Importantly, we found that the maximum piezoelectric response (d{sub 33} = 545pC/N) was achieved at the boundary between the T and O phase, indicating that the giant piezoelectricity of BZT-xBCT may mainly stem from the T-O phase boundary due to easier polarization rotation and larger lattice softening.
Authors:
; ; ; ; ;  [1] ; ; ;  [1] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Multidisciplinary Material Research Center, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710054 (China)
  2. (China)
  3. (Japan)
Publication Date:
OSTI Identifier:
22350971
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CERAMICS; ORTHORHOMBIC LATTICES; OXYGEN COMPOUNDS; PERMITTIVITY; PHASE TRANSFORMATIONS; PIEZOELECTRICITY; POLARIZATION; ROTATION; SOLID SOLUTIONS; TITANATES; TITANIUM COMPOUNDS; TITANIUM IONS; TITANIUM OXIDES; TRIGONAL LATTICES; X-RAY DIFFRACTION; ZIRCONIUM COMPOUNDS