The thermal expansion and the magnetic susceptibility under ambient pressure and the temperature dependence of electrical resistivity under applied pressures for β-Mn1-xOsx alloys have been investigated. The concentration dependence of the spontaneous volume magneto-striction at 0 K, ωmag(0), exhibits a broad maximum at about x = 0.14. The thermal expansion characteristic is explained qualitatively by the unified model based on the self-consistent renormalization theory. A weak itinerant-electron antiferromagnetic state in the β-Mn1-xOsx alloys varies with x to an intermediate state. The pressure coefficient of the Néel temperature decreases with increasing x, in accord with the variation of the magnetic state.
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