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Peter Finkel, Ahmed Amin, Sam Lofland, Jaojin Yao and Dwight Viehland Phase switching at low field and large sustainable strain output in domain engineered ferroic crystals physica status solidi (a) 209

Version of Record online: 6 AUG 2012 | DOI: 10.1002/pssa.201228314

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Finkel et al. show that the ferroic morphotropic relaxor PIN-PMN-PT (i.e., the ternary lead indium niobate - lead magnesium niobate - lead titanate) crystal exhibits an unusual lack of fatigue after a million of strain cycles, compared to other ferroic systems degrading after a few cycles. A strain accommodation model is proposed as a plausible explanation to sustainable phase switching, supported by polarized light microscopy experiments under applied electric field. X-ray diffraction experiments on “free” and “clamped” crystals reveal a lattice strain that is in very good agreement with the macroscopic observation and phenomenological model calculation. The results confirm the proposed hypothesis of a phase transition from macro-domain ferroelectric rhombohedral (FR) to mono-domain ferroelectric orthorhombic (FO).

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