Abstract
The strain versus electric field (ε−E) and strain versus stress (ε−σ) response characteristics of 〈001〉-oriented crystals of Pb(BI1/3BII2/3)O3–PbTiO3 have been investigated. Under zero field, a ferroelastic switching has been observed under moderate uniaxial prestress levels. The magnitude of the elastic strain switched was ∼0.4%. In addition, an elastic softening was observed during switching, where the elastic constant decreased from ∼1010 to ∼3×109 N/m2. At higher stresses, the elastic constant stiffened to ∼5×1010 N/m2, which upon application of dc electrical bias softened to ∼1010 N/m2. The importance of ferroelastic switching and elastic nonlinearity is discussed.
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