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General equation of state for the pressure and temperature-induced transition in the ferroelectric triglycine selenate

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Volume
292
Identifiers
DOI: 10.1016/s0921-4526(00)00500-7
Keywords
  • Phase Transition
  • Ferroelectrics
  • Pressure
  • Scaling

Abstract

Abstract An experimental investigation of the phase transition induced by temperature and pressure in the uniaxial ferroelectric triglycine selenate, which exhibits a quasi-tricritical point at T c≈21.7°C (at ambient pressure), has been performed. The combined pressure and temperature dependences of polarization versus electric field are shown to fit well by effective field theory using the general scaling combination [1−( T/ T c+ p/ p c)] which involves temperature ( T) and pressure ( p), T c being the transition temperature at zero pressure and p c=−81.81 kbar the transition pressure extrapolated to zero absolute temperature.

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