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Determination of the Temperature Coefficient Distribution of Dielectric Ceramics Using Scanning Photothermal Dielectric Microscopy
Author(s) -
Cho Yasuo,
Kasahara Teruaki,
Fukuda Koichi
Publication year - 1999
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.1151-2916.1999.tb01991.x
Subject(s) - dielectric , ceramic , temperature coefficient , materials science , analytical chemistry (journal) , scanning electron microscope , photothermal therapy , microscopy , phase (matter) , mineralogy , composite material , optics , chemistry , nanotechnology , optoelectronics , chromatography , physics , organic chemistry
Two‐dimensional images of the distribution showing the temperature coefficient of the dielectric constant for two types of two‐phase composite ceramics composed of TiO 2 ‐Bi 2 Ti 4 O 11 and BaTi 4 O 9 ‐BaPr 2 Ti 4 O 12 were obtained using scanning photothermal dielectric microscopy. The images of the TiO 2 ‐Bi 2 Ti 4 O 11 ceramic showed that the TiO 2 and Bi 2 Ti 4 O 11 grains had negative and positive temperature coefficients, respectively, and that the macroscopic averaged temperature coefficient of the ceramic was relatively low because of the cancellation of the opposite signs of the coefficients. On the other hand, the images of the BaTi 4 O 9 ‐BaPr 2 Ti 4 O 12 ceramic showed that the temperature coefficient of both grains had the same sign (negative), although their absolute values were quite different.