An influence of hydrostatic pressure on phase transition temperature, T_C, and spontaneous magnetisation, M₀, of selected perovskite ruthenates (SrRuO₃, La_0.2Sr_0.8RuO₃, SrRu_0.9Mn_0.1O₃ and SrRu_0.9Cr_0.1O₃) has been determined from magnetic measurements performed in the pressure interval of 0-12 kbar. Decrease of T_C with pressure has been found for all of the samples. The M₀(P) remains unchanged for most of the samples, except the La_0.2Sr_0.8RuO₃ sample, where M₀ decreases with pressure. For La_0.2Sr_0.8RuO₃, the pressure coefficient dT_C/dP = -0.67 K/kbar is very similar to that of SrRuO₃ (-0.68 K/kbar). For SrRu_0.9Cr_0.1O₃ and SrRu_0.9Mn_0.1O₃ the pressure coefficient dT_C/dP is equal to about -0.5 K/kbar. The decrease of T_C in SrRuO₃ was reported earlier and explained in terms of strain effects. For La-substituted compound, a similar decrease of T_C with increasing pressure is probably caused also by the strain effects. The decrease of T_C with increasing pressure for both Cr-substituted and Mn-substituted samples indicates an overall band structure effect on T_C for these hole-doped compounds. Since the pressure affects the Ru-O-Ru bond angles and the Ru-O bond lengths, and the ferromagnetism in ruthenates is sensitive to these parameters, a weakening of ferromagnetic interactions is, thus, consistent with complex band structure effects related to the modulation of the Ru-O hybridisation by the change of structural distortion.

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