Two-dimensional images of the distribution showing the temperature coefficient of the dielectric constant for two kinds of two-phase composite ceramics composed of TiO2-Bi2Ti4O11 and BaTi4O9-BaPr2Ti4O12 were obtained using scanning photothermal dielectric microscopy. The images of the TiO2-Bi2Ti4O11 ceramic clearly show that each grain of TiO2 and Bi2Ti4O11 in the ceramic had a negative and a positive temperature coefficient, respectively, and that the macroscopic averaged temperature coefficient of the ceramic was relatively low due to the cancellation of the coefficients. On the other hand, the images of the BaTi4O9-BaPr2Ti4O12 ceramic showed that the temperature coefficient of each grain had the same sign (negative), although their absolute values were quite different.
- Photothermal dielectric microscopy
- Temperature coefficient
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics