Studies on electrical conduction and dielectric properties of ferroelectric lead nitrate phosphate and rubidium hydrogen tartrate single crystals

Desai, C. C.; Patel, A.; Ramana, M. S. V.

doi:10.1080/00150199008221462

Cited by 13 publications

(1 citation statement)

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“…Subsequently, other types of double salts of tartaric acid were investigated for their dielectric behavior [9,10]. Dielectric and thermal properties of many tartrate salts with monovalent cations; such as rubidium hydrogen tartrate [11], sodium tartrate [12] and ammonium tartrate [13] and divalent cations; such as calcium tartrate [14], cadmium tartrate [1], manganese tartrate [15], zinc tartrate [16] and strontium tartrate [17,18] have been investigated. Some of these materials have shown to be ferroelectric [1,[8][9][10]14] while others are non-ferroelectric [12,13].The rare earth tartrates bearing the formula R 2 (C 4 H 4 O 6 ) 3 ·xH 2 O (where R = Y ,Sm) are shown to be thermally unstable and start decomposing at a temperature of about 50°C [19].…”

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confidence: 99%

Dielectric and thermal behaviour of holmium tartrate trihydrate crystals

Want

Ahmad

Kotru

2007

Cryst. Res. Technol.

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Measurements on dielectric constant of holmium tartrate trihydrate crystals at frequencies of the applied a.c. in the range 1 kHz to 1 MHz and at temperature in the range 30°C to 330°C are reported. The dielectric constant ε' increases with temperature at all frequencies, attains a peak near 250°C, and then decreases as the temperature goes beyond 250°C. The anomalous dielectric behaviour at near about 250°C is attributed to be as a result of crystallographic/polymorphic phase transition brought about in the material. The results on the dielectric behaviour of the material are supplemented by results of thermal analysis viz., TG and DTA. Thermogravimetric and differential thermal analytic techniques have been used to study thermal behaviour of the material. It is shown that the material is thermally stable up to 220°C beyond which it decomposes through three stages till the formation of holmium oxide at 1200°C. The non-isothermal kinetic parameters e.g., activation energy and the frequency factor have been evaluated for first two stages of thermal decomposition by using the integral method of Coats and Redfern.

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