Electrical resistivities ϱ and lattice parameters of quasi‐two‐dimensional crystals of monoclinic η‐Mo4O11 and orthorhombic γ‐Mo4O11 are measured under hydrostatic pressure up to 1.2 GPa at room temperature. Both crystals have negative pressure coefficients of ϱ, which can be qualitatively explained by a phonon stiffening effect. In particular, the pressure dependence of ϱ for γ‐Mo4O11 shows a drastic drop or jump at Pc = 0.3 GPa, whose magnitude and the pressure coefficients are strongly dependent on the sample resistivity or degree of stoichiometry. It is suggested that the change of a small amount of MoO4 tetrahedra into MoO6 octahedra induced by excess oxygen atoms is responsible for such structure‐sensitive properties.
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Koyano et al. (1988) studied this question.