Dielectric, Ferroelectric and Thermal Studies of Gel Grown Yttrium Tartrate (YT) Crystals

Yttrium tartrate (YT) single crystals have been grown by gel encapsulation technique. The crystallinity of the grown crystals was confirmed by XRD technique. The dielectric constant, dielectric loss and ac conductivity was measured as a function of frequency in the range 1 kHz to 1 MHz and temperature range of 30°C to 250°C. Dielectric studies shows two transition peaks at temperature of 80°C and 210°C. These transition peaks are further supported by thermal studies. The nature of transitions can be explained by relation (1/ϵ′−1/ϵ ′ _max ) = A (T − Tc)^γ and is reported to be diffused transitions. The variation of ac conductivity with temperature and frequency has been reported and is represented by the relation σ (ω) = Aω ^s . The saturation polarization (P _s ), remanent polarization (P _r ) and coercive field (E _c ) of the polarization-electric field hysteresis are reported for this material. These dielectric results are then correlated with thermal studies. The material (YT) is proposed to be ferroelectric.

Keywords:

• Yttrium tartrate
• gel technique
• dielectric
• ferroelectric

Acknowledgments

The authors are thankful to Council of Scientific and Industrial Research (CSIR), New Delhi, for providing funds under the Scheme No. 03(0982)/03/EMR–II. One of the authors (B.K.) is thankful to CSIR, New Delhi for providing Senior Research Fellowship (SRF) in this scheme.