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Microstructure and Dielectric Characteristics of (Pb x Ba 0.5−x Sr 0.5 )TiO 3 Ceramics
Author(s) -
Ganesh Ramaratnam,
Goo Edward
Publication year - 1996
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.1151-2916.1996.tb07902.x
Subject(s) - dielectric , tetragonal crystal system , ferroelectricity , materials science , microstructure , solid solution , mineralogy , ternary operation , ceramic , analytical chemistry (journal) , permittivity , ternary numeral system , ferroelectric ceramics , crystallography , crystal structure , chemistry , composite material , metallurgy , optoelectronics , computer science , programming language , chromatography
Microstructural and dielectric properties of the Pb x Ba 0.5 _ x —Sr 0.5 TiO 3 system have been studied. It is found that this system forms a solid solution in the entire composition range (0.0≤ x ≤0.5) and is cubic for the x = 0, 0.1, and 0.2 compositions and tetragonal for other compositions. Measurements of the dielectric constant as a function of temperature reveal that this material is ferroelectric at room temperature for the x > 0.2 compositions and has a broad paraelectric‐ferroelectric transition region. No shift in the dielectric maxima was noted; however, there is a slight spread in the dielectric constant with frequency for the x = 0.4 composition. A quantitative model to mathematically analyze the effect of composition fluctuations on the dielectric broadening for a ternary system is presented. Transmission electron microscopic studies reveal the presence of 90° ferroelectric domains oriented along the {01} planes for the x = 0.3 and 0.4 compositions.