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Title: Ferroelectric, and piezoelectric properties of BaTi{sub 1−x}Al{sub x}O{sub 3}, 0 ≤ x ≤ 0.015

Single phase polycrystalline samples of BaTi{sub 1−x}Al{sub x}O{sub 3}, 0 ≤ x ≤ 0.015, have been prepared by a conventional powder processing method. The Rietveld refinements of X- ray powder diffraction patterns at room temperature indicate that the samples crystallize in tetragonal structure with group symmetry P4mm. Because of the oxygen vacancies, the volume of the unit cell increases with increasing x. Field emission scanning electron microscopy revealed that the particle size of pure BTO ceramics was affected by the Al content. Dielectric, ferroelectric and piezoelectric properties of pure BTO as well as Al-doped BTO were studied. It was found that the dielectric permittivity (ε′) increases significantly with increasing x while the transition from ferroelectric phase to a paraelectric phase changes slightly. The Curie-Weiss law is verified over a wide temperature range. Both ferroelectric and piezoelectric properties of BTO are enhanced by the substitution of Ti{sup 4+} by Al{sup 3+} ions. Piezoelectric strains of Al-doped BTO showed a suitable behavior for application compared with that of pure BTO compound. Finally, the results obtained in this work are discussed and compared with those for similar materials.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Energy Harvest-Storage Research Center and Department of Physics, University of Ulsan, Ulsan 680-749 (Korea, Republic of)
  2. (Egypt)
  3. Department of Physics, Faculty of Science, Fayoum University, 63514 El Fayoum (Egypt)
  4. Center of Nano Science and Technology, Hanoi National University of Education, 122000, Hanoi (Viet Nam)
Publication Date:
OSTI Identifier:
22492345
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 9; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINATES; BARIUM COMPOUNDS; CERAMICS; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; CURIE-WEISS LAW; DOPED MATERIALS; FERROELECTRIC MATERIALS; FIELD EMISSION; PARTICLE SIZE; PERMITTIVITY; PIEZOELECTRICITY; POLYCRYSTALS; POWDERS; SCANNING ELECTRON MICROSCOPY; STRAINS; TETRAGONAL LATTICES; TITANATES; VACANCIES; X-RAY DIFFRACTION