Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3182679
Keywords
barium compounds; bismuth compounds; piezoceramics; piezoelectricity; sodium compounds; solid-state phase transformations; texture; X-ray diffraction
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The electric-field-induced strain in 93%(Bi0.5Na0.5)TiO3-7%BaTiO3 polycrystalline ceramic is shown to be the result of an electric-field-induced phase transformation from a pseudocubic to tetragonal symmetry. High-energy x-ray diffraction is used to illustrate the microstructural nature of the transformation. A combination of induced unit cell volumetric changes, domain texture, and anisotropic lattice strains are responsible for the observed macroscopic strain. This strain mechanism is not analogous to the high electric-field-induced strains observed in lead-based morphotropic phase boundary systems. Thus, systems which appear cubic under zero field should not be excluded from the search for lead-free piezoelectric compositions.
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