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Remarkable Strontium B‐Site Occupancy in Ferroelectric Pb(Zr 1− x Ti x )O 3 Solid Solutions Doped With Cryolite‐Type Strontium Niobate
Author(s) -
Feltz Adalbert,
SchmidtWinkel Patrick,
Schossmann Michael,
Booth Corwin H.,
Albering Jörg H.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02027.x
Subject(s) - strontium , extended x ray absorption fine structure , cryolite , tantalate , ferroelectricity , materials science , solid solution , doping , perovskite (structure) , mineralogy , strontium titanate , analytical chemistry (journal) , crystallography , absorption spectroscopy , thin film , nanotechnology , chemistry , aluminium , dielectric , composite material , optics , optoelectronics , physics , metallurgy , organic chemistry , chromatography
New high‐performance ferroelectric solid solutions based on Pb(Zr 1− x Ti x )O 3 (PZT), which are doped with cryolite‐type strontium niobate (SNO, Sr 4 (Sr 2−2y/3 Nb 2+2 y /3 )O 11+ y V O ; 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 Sr 2+ occupy the nominal B‐sites of the perovskite‐type PZT host lattice. This result is supported by EXAFS analyses of both a canonical SrTiO 3 perovskite and two SNO model and reference compounds. Fit models that do not account for Sr 2+ 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.