Majority of research of La_1-xSr_xMnO₃ manganites was performed for x < 0.4 compositions. Only a few papers (~5) described properties of the 0.6 < x ≤ 1.0 samples. This was caused by an inherent difficulty in synthesizing samples with x > 0.5. In the present studies, the phase diagram for the whole range of compositions (0 ≤ x ≤ 1) was investigated by means of the specific heat measurements, that were performed for 11 selected compositions, over the temperature range 2-390 K, in magnetic field up to 9 T. As a result, (1) two controversies concerning the phase diagram have been clarified, i.e., it was shown that the order of the Jahn-Teller transition does not depend on x and that the phase transition occurring below the Curie temperature for the 0.155 ≤ x ≤ 0.17 samples is the Jahn-Teller transition, not a charge ordering one. (2) The ferromagnet-paramagnet, antiferromagnet-paramagnet, and antiferromagnet-ferromagnet transitions have been thoroughly studied. It was evidenced that the shape of the specific heat anomaly and the kind of critical behavior of the specific heat at the antiferromagnet-paramagnet phase transition strongly depended on the type of the antiferromagnetic configuration (A, C, and G). The temperature of the first order antiferromagnet-ferromagnet transition occurring in the x = 0.55 composition was found to be strongly lowered by the magnetic field (by ~33 K for 9 T). (3) Two parameters characterizing magnetocaloric effect, i.e., the change of temperature of an adiabatically isolated sample and the change of entropy of a sample under isothermal conditions, induced by the change of magnetic field, have been determined. The values of these parameters, allowing to assess applicability of the studied material for magnetic refrigeration, suggest that the magnetocaloric effect in (La,Sr)MnO₃ is substantial but not outstanding in comparison with other refrigerant materials.

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