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Uniaxial compressive stress and temperature dependent mechanical behavior of (1-x)BiFeO₃-xBaTiO₃ lead-free piezoelectric ceramics

Khansur, Neamul H.; Glaumb, Julia; Clemens, Oliver; Zhang, Hailong; Daniels, John E.; Webber, Kyle G.

Abstract:
The mechanical behavior of polycrystalline lead-free $(1-x)$BiFeO$_{3}$-xBaTiO$_{3}$ (BF-BT) piezoelectric ceramics was investigated under uniaxial compressive stress from room temperature up to 400 degrees C with macroscopic stress strain measurements and in situ stress-dependent neutron diffraction. Stress-strain curves revealed a changing mechanical response with BaTiO$_{3}$ content and temperature. With decreasing BaTiO$_{3}$ content there was an increase in the coercive stress, which reduced the remanent strain and hysteresis. Full pattern structural refinement of the neutron data reveals both rhombohedral distortion and magnetic moment decreases with increasing BaTiO$_{3}$ content. In situ stress-dependent neutron diffraction experiments showed that accommodation of external stress occurs through the changes in tilt magnitude and anisotropy of oxygen octahedra at room temperature. The origin of stress-induced strain at room temperature is a lattice deformation without any apparent change in average crystallographic symmetry or domain switching. Temperature-dependent in situ stress-induced measurement of BF-3OBT showed maximum ... mehr


Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 0272-8842, 1873-3956
KITopen ID: 1000074282
HGF-Programm 43.22.01; LK 01
Erschienen in Ceramics international
Band 43
Heft 12
Seiten 9092-9098
Schlagworte Piezoelectric properties, Mechanical properties, Perovskite, Functional applications
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