Abstract
The entropy excess corresponding to the cubic to tetragonal transition in Ca0.04Sr0.96TiO3 perovskite has been obtained by integration of specific heat measured by conduction calorimetry. The order parameter of the transition has been obtained by means of neutron diffraction at low temperatures. Comparison of calorimetric data with the evolution of the order parameter indicates that this transition follows a mean field Landau potential as in SrTiO3. The linear behaviour of the excess of entropy versus temperature suggests that a 2-4 Landau potential is sufficient to describe the transition. The Ca effect in thermodinamical properties of SrTiO3 is compared with the effect of an uniaxial stress applied on pure SrTiO3.
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