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Updated: May 31, 2026
11:17
Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
Published on: February 9, 2017
High pressure ferroelastic phase transition in SrTiO₃.
E K H Salje1, M Guennou, P Bouvier
1Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK.
Summary
High pressure studies reveal strontium titanate (SrTiO₃) undergoes a phase transition with linear temperature dependence. Nonlinear couplings drive a crossover from tricritical to second-order transitions under pressure.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Ferroelastic phase transitions are crucial in materials like strontium titanate (SrTiO₃).
- Understanding the influence of external stimuli, such as pressure, on these transitions is key to materials design.
Purpose of the Study:
- To investigate the ferroelastic phase transition of SrTiO₃ under high pressure.
- To analyze the pressure dependence of the transition temperature and order of the phase transition.
Main Methods:
- High pressure measurements were conducted on SrTiO₃.
- Analysis involved the Clausius-Clapeyron relationship and a pressure-dependent Landau potential.
Main Results:
- A linear pressure dependence of the cubic-tetragonal transition temperature was observed.
- Pressure-induced transitions exhibit second-order behavior, contrasting with the near-tricritical temperature-dependent transition.
- Nonlinear couplings between the structural order parameter, volume strain, and pressure were identified.
Conclusions:
- The nonlinearities lead to an increasing fourth-order Landau coefficient with pressure.
- This results in a crossover from tricritical to second-order behavior, similar to doping effects in KMnF₃.
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