Critical Exponents of Ferroelectric SrTi¹⁸O₃

Abstract

Measurements of the temperature dependence of spontaneous polarization and dielectric constant in the vicinity of the phase transition at ∼26 K in SrTi ¹⁸ O ₃ were performed and the critical exponents were determined. The critical exponents β and γ have classical Landau values. These values confirm that we are dealing with the classical paraelectric to ferroelectric transition of the soft mode type in agreement with recent optical studies. We can also conclude that the Lyddane-Sachs-Teller relationship is obeyed in this system.

Keywords:

• Critical exponents
• spontanious polarization
• dielectric constant
• SrTi¹⁸O₃