Is Barrett Equation Universally Applicable for Explaining Dielectric Constant of Ferroelectrics and Ferroelectric Thin Films?

Authors

  • S. Lahiry Department of Physics, Sri Aurobindo College, University of Delhi, Delhi, India

DOI:

https://doi.org/10.3329/jsr.v16i2.69553

Abstract

Slater’s formula for perovskite ferroelectrics was modified by Barrett to include the quantum effect. Dielectric constant vs temperature (e¢ vs. T) data for Strontium titanate (ST) and Potassium tantalate (KT) in single crystals and ceramics fitted well, while the data (e¢ vs. T) for Barium titanate (BT) in single crystals and ceramics did not fit at all to Barrett’s equation. That is, ferroelectrics like ST, which show only Curie-Weiss temperature but does not show a ferroelectric transition, obey Barrett’s equation. The Curie-Weiss law fitted the data of BT well. That KT a cubic and consequently a paraelectric down to 13 K obeys Barrett’s equation is intriguing. e¢ vs T values of Barium strontium titanate (BaxSr1-xTiO3), thin films could be fitted to the Curie-Weiss law, thus eliminating the existence of quantum effect in thin films.

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Published

2024-05-01

How to Cite

Lahiry, S. (2024). Is Barrett Equation Universally Applicable for Explaining Dielectric Constant of Ferroelectrics and Ferroelectric Thin Films?. Journal of Scientific Research, 16(2), 517–526. https://doi.org/10.3329/jsr.v16i2.69553

Issue

Section

Section A: Physical and Mathematical Sciences