High temperature dielectric properties of cubic bismuth zinc tantalate.

• Main Authors: Khaw, Chwin Chieh, Tan, Kar Ban, Lee, C. K.
• Format: Article
• Language: English; English
• Published: Elsevier Limited 2009
• Online Access: http://psasir.upm.edu.my/id/eprint/15007/1/High%20temperature%20dielectric%20properties%20of%20cubic%20bismuth%20zinc%20tantalate.pdf; http://psasir.upm.edu.my/id/eprint/15007/

Electrical properties of the parent phase in the Bi2O3–ZnO–Ta2O5 ternary system, cubic Bi1.5ZnTa1.5O7 (α-BZT), P, are investigated using impedance spectroscopy. P has permittivity (ɛ′) of 58, dielectric loss (tan δ) of 0.0023 at 30 °C and 1 MHz; temperature coefficient of capacitance (TCC) of −156 ppm/°C in the range of 30–300 °C at 1 MHz. A high degree of dispersion in the permittivity at low frequencies (<1 kHz) and temperatures above 500 °C is apparent. Dielectric losses exhibit non-frequency dependence at low temperatures presenting an increase at temperatures above 500 °C. A decrease of the loss occurs with increasing frequency.