Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 47, Issue 9, Pages 7753-7756Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.47.7753
Keywords
CaCU3Ti4O12; giant susceptibility; phase transition; perovskite
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The dielectric properties, and structural behavior of perovskite-related CaCu3Ti4O12 were studied at high temperatures. The dielectric constant increase gradually with incrreasing temperature and shows a shoulder-like round anomaly at approximately 630K at 10 kHz. At 732K a new dielectric anomaly was found, where the peak value of the dielectric constant epsilon peak similar or equal to 2.8 x 10(6) at a frequency of 10 kHz. The lattice constant and X-ray intensity of the (880) reflection also exhibit an anomaly at 732K. These findings indicate that CaCu3Ti4O12 undergoes a structural phase transition at 732K.
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