Abstract
New high‐performance ferroelectric solid solutions based on Pb(Zr1−xTix)O3 (PZT), which are doped with cryolite‐type strontium niobate (SNO, Sr4(Sr2−2y/3Nb2+2y/3)O11+yVO;1−y with 0≤y≤1) and hence denoted PZT:SNO, and their microscopic structure and defect chemistry are described. Extended X‐ray absorption fine‐structure (EXAFS) analyses of PZT:SNO samples revealed that ∼10% of Sr2+ occupy the nominal B‐sites of the perovskite‐type PZT host lattice. This result is supported by EXAFS analyses of both a canonical SrTiO3 perovskite and two SNO model and reference compounds. Fit models that do not account for Sr2+ on B‐sites are ruled out. A clear Sr–Pb peak in Fourier‐transformed EXAFS data visually confirms this structural model. The generation of temporary oxygen vacancies and the intricate defect chemistry induced by SNO‐doping of PZT are crucial for the exceptional material properties of PZT:SNO. As a result, ferroelectric PZT:SNO solid solutions are very attractive for use in new and innovative piezoelectric actuator and transducer applications.
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