Dielectric and thermal characteristics of gel grown single crystals of ytterbium tartrate trihydrate
- 90 Downloads
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.
KeywordsTartrate Tartaric Acid Ytterbium Differential Thermal Analysis Curve Observe Weight Loss
One of the authors (B. Want) is thankful to the UGC, New Delhi and Department of Higher Education, Government of J & K for extending the tenure of the teacher fellowship. The corresponding author (PNK) is thankful to the All India Council of Technical Education, New Delhi for award of Emeritus fellowship. The authors are grateful to Professor T. K. Razdan of the Department of Chemistry, University of Kashmir, presently at the Department of Chemistry, University of Jammu, for his valuable suggestions.
- 2.Rahimkutty MH, Rajendra Babu K, Shreedharan Pillai K, Sudarshana Kumar MR, Nair CMK (2001) Bull MaterSci 24:249Google Scholar
- 7.Jona F, Shirane G (1993) In: Ferroelectric Crystals. Dover Publications, Inc., New York, Ch.VIIGoogle Scholar
- 11.Desai CC, Patel AH, Ramana MSV (1990) Ferroelectrics 23:102Google Scholar
- 21.Henisch HK (1973) In: Crystal Growth in Gels. Pennsylvania State University Press, University Park, PAGoogle Scholar
- 25.Hawthorne FC, Borys I, Ferguson RB (1983) Acta Cryst C39:540Google Scholar
- 27.Chuan-De W, Xiao-Ping Z, Can-Zhong L, Hong-Hui Z, Jin-Shun H (2002) Acta Cryst E58:228Google Scholar
- 28.Schuster P (1976) In: The hydrogen bond—recent developments in theory and experiments. North-Holland Publ. Co., Amsterdam, p 1142Google Scholar
- 29.Mackenzie RC (1972) In: Differential thermal analysis. Academic Press London, vol 2, Ch. 44, p 500Google Scholar
- 31.Nakamoto K (1997) In: Infra red and Raman spectra of inorganic and coordination compounds. John Wiley & Sons, 5th edn, part B, Ch. III, p 70Google Scholar