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Investigation of the dielectric and thermal properties of sintered Li1−x Ta1−3x Ti4xO3 solid solution ceramics

Published online by Cambridge University Press:  31 January 2011

K. K. Deb
K. K. Deb
Affiliation:
Center for Night Vision and Electro-Optics, Fort Belvoir, Virginia 22060-5677
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Abstract

A series of twelve Li1−x Ta1−3x Ti4xO3 solid solution ceramics was sintered following the low-temperature metal alkoxide routes. Measurements of dielectric constants, dielectric losses, and heat capacities as functions of temperature and frequency are presented. The Curie temperature (Tc) in comparison to LiTaO3 was reduced from 620°C to about 358°C in the Li0.91 Ta0.73 Ti0.36O3 ceramics. The heat capacity data showed no dependence on the bulk density or grain size. Also the mechanical properties of the undoped crystals appear to stay undisturbed. On the other hand, an apparently abnormal dependence of the Curie temperature on density was found. Heat capacity and dielectric loss decreased while the dielectric constant increased with the addition of Ti+4 doping in the LiTaO3 structure. Overall, a good detector performance might indeed be obtained from these ceramic materials if they can be poled reproducibly.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 5 , October 1987 , pp. 588 - 594
Copyright
Copyright © Materials Research Society 1987

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References

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