Dielectric and thermal characteristics of gel grown single crystals of ytterbium tartrate trihydrate |
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Authors: | Basharat Want Farooq Ahmad P N Kotru |
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Affiliation: | (1) Department of Physics, University of Kashmir, Srinagar, Jammu & Kashmir, 190006, India;(2) Department of Physics and Electronics, University of Jammu, Jammu, 180006, India |
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Abstract: | Dielectric and thermal characteristics of gel grown single crystals of ytterbium tartrate trihydrate have been carried out.
The dielectric constant has been measured as a function of frequency in the range 2 kHz–1 MHz and temperature range 30–300 °C.
The dielectric constant increases with temperature, attains a peak near 215 °C, and then decreases as the temperature exceeds
215 °C. The dielectric anomaly at 215 °C is suggested to be due to phase transition brought about in the material. The dielectric
behaviour of the material is correlated with the results on thermal analysis. Thermogravimetric and differential thermal analysis
have been used to study the thermal characteristics of the material. The experimental results show that the material is thermally
stable up to 200 °C. The decomposition process occurs in two stages until ytterbium oxide is formed at 700 °C. The non-isothermal
kinetic parameters e.g., activation energy and the frequency factor have been evaluated for each stage of thermal decomposition
by using the integral method, applying the Coats–Redfern approximation. |
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