Abstract
Below its ordering temperature at 105 K, perovskite-typeSrTiO3 exhibits a tetragonal phase with three different structural domains that are stronglyinfluenced by the application of uniaxial mechanical stresses and electric fields. A carefulneutron diffraction study of superlattice reflections provides full quantitative informationabout the varying domain distributions under external loads as a function of temperature.It is shown that electric field and uniaxial stress exhibit competitive effects and thesimultaneous application leads to a complex redistribution behaviour of the tetragonaldomains. The results are discussed in the context of the formation of a field inducedferroelectric phase at low temperatures. The experimental findings demonstrate that itspolarization is always perpendicular to the tetragonal axis and the polar phase hasorthorhombic symmetry.
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