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Title: Structural stability and depolarization of manganese-doped (Bi₀.₅Na₀.₅){sub 1−x}Ba{sub x}TiO₃ relaxor ferroelectrics

This work reveals that 0.5 mol. % manganese (Mn) doping in (Bi₀.₅Na₀.₅){sub 1−x}Ba{sub x}TiO₃ (x = 0 and 0.075) solid solutions can increase structural thermal stability, depolarization temperature (T{sub d}), piezoelectric coefficient (d₃₃), and electromechanical coupling factor (kₜ). High-resolution X-ray diffraction and transmission electron microscopy reveal coexistence of rhombohedral (R) R3c and tetragonal (T) P4bm phases in (Bi₀.₅Na₀.₅)₀.₉₂₅Ba₀.₀₇₅TiO₃ (BN7.5BT) and 0.5 mol. % Mn-doped BN7.5BT (BN7.5BT-0.5Mn). (Bi₀.₅Na₀.₅)TiO₃ (BNT) and BN7.5BT show an R − R + T phase transition, which does not occur in 0.5 mol. % Mn-doped BNT (BNT-0.5Mn) and BN7.5BT-0.5Mn. Dielectric permittivity (ε′) follows the Curie-Weiss equation, ε′ = C/(T − T{sub o}), above the Burns temperature (TB), below which polar nanoregions begin to develop. The direct piezoelectric coefficient (d₃₃) and electromechanical coupling factor (kₜ) of BN7.5BT-0.5Mn reach 190 pC/N and 47%.
Authors:
 [1] ;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
  2. (China)
  3. Department of Mechanical Engineering, Ming-Chi University of Technology, New Taipei City 24301, Taiwan (China)
  4. Department of Mechanical Engineering, Hwa-Hsia University of Technology, New Taipei City 23567, Taiwan (China)
  5. Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
  6. Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
Publication Date:
OSTI Identifier:
22305832
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM COMPOUNDS; BISMUTH COMPOUNDS; COUPLING; DEPOLARIZATION; DOPED MATERIALS; FERROELECTRIC MATERIALS; MANGANESE ADDITIONS; PERMITTIVITY; PHASE TRANSFORMATIONS; PIEZOELECTRICITY; RESOLUTION; SODIUM COMPOUNDS; SOLID SOLUTIONS; STABILITY; TETRAGONAL LATTICES; TITANATES; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; TRIGONAL LATTICES; X-RAY DIFFRACTION