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Role of Secondary Phase in High Power Piezoelectric PMN‐PZT Ceramics
Author(s) -
Yan Yongke,
Cho KyungHoon,
Priya Shashank
Publication year - 2011
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.1551-2916.2011.04891.x
Subject(s) - materials science , doping , piezoelectricity , grain growth , ceramic , grain size , dielectric , phase (matter) , divalent , mineralogy , analytical chemistry (journal) , composite material , chemistry , metallurgy , optoelectronics , organic chemistry , chromatography
This study reports the dielectric and piezoelectric properties of 0.4 Pb ( Mg 1/3 Nb 2/3 ) O 3 ‐0.25 PbZrO 3 ‐0.35 PbTiO 3 ( PMN‐PZT ), 2 mol% MnO 2 ‐doped 0.4 Pb ( Mg 1/3 Nb 2/3 ) O 3 ‐0.25 PbZrO 3 ‐0.35 PbTiO 3 ( MnO 2 +PMN‐PZT ), and 0.06 Pb ( Mn 1/3 Nb 2/3 ) O 3 ‐0.34 Pb ( Mg 1/3 Nb 2/3 ) O 3 ‐0.25 PbZrO 3 ‐0.35 PbTiO 3 ( PMnN+PMN‐PZT ) ceramics. The results show that MnO 2 modification results in the formation of MgO secondary phase which promotes grain growth and reduces the electromechanical properties. We conclusively demonstrate that Mn 2+ acts as pervoskite stabilizer in Pb ‐based (1:2) relaxors and leads to the formation of divalent oxide secondary phase. Modification with PMnN avoids the formation of MgO and provides combinatory doping effect with smaller grain sizes.