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Dielectric and Ordering Behavior in Pb x Ca 1−x TiO 3
Author(s) -
Ganesh Ramaratnam,
Goo Edward
Publication year - 1997
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.1151-2916.1997.tb02881.x
Subject(s) - tetragonal crystal system , calcium titanate , orthorhombic crystal system , dielectric , materials science , crystallography , solid solution , lead titanate , titanate , microstructure , ferroelectricity , crystal structure , superlattice , mineralogy , analytical chemistry (journal) , ceramic , chemistry , metallurgy , optoelectronics , chromatography
The dielectric properties and microstructure of Pb x Ca 1−x TiO 3 are reported. At room temperature, Pb x Ca 1−x TiO 3 is orthorhombic for compositions where x is 0.1 and 0.2, pseudocubic for compositions where x is 0.3 and 0.4, and tetragonal for compositions where x $0.5. TEM studies on the calcium‐rich compositions reveal the presence of 1/2{100}‐, 1/2{110}‐, and 1/2{111}‐type superlattice reflections in three principal zone axes. An analysis of crystal structure, based on the atomic displacements and the ordering of lead and calcium atoms, is reported. No ordering behavior is observed for the compositions where x is 0.1 and 0.2; however, partial ordering of lead and calcium atoms occurs for compositions where 0.3 # x # 0.60. The dielectric measurements do not reveal any relaxor behavior; however, the addition of calcium titanate to lead titanate broadens the width of the transition region. Calculation of the diffuseness parameter, δ, from the power‐law model also is presented.