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Two Co1−xMgxMoO4oxide compositions (x= 0 and x=0.4) were investigated as potential pressure indicators. The first order phase half-transition induced by pressure application from the β to the α form, i.e. from the high temperature/low pressure form to the high pressure/low temperature form, was studied thanks to the powder diffuse reflection (color) evolution versus the applied pressure. Three key parameters were analyzed: (i) the magnesium content, (ii) the powder grain sizes, (iii) the pressure application mode (uniaxial or isostatical). It was shown these three parameters allow tuning the transition pressure in a wide range from few bars to few kbars.

Zn1‐xCoxMoO4(x < 0.3) powders are prepared by solid state reaction of stoichiometric mixtures of MoO3, Co3O4, and ZnO (alumina crucible, 700 °C, 20 h and 800 °C, 10 h).

Pure β‐Co1‐xMgxMoO4(0 ≤ x ≤ 1) solid solutions are prepared by solid state reactions of stoichiometric mixtures of MoO3, Co3O4, and MgO (alumina crucible, 700 °C, 20 h).

The chromic phase transition from the high‐temperature/low‐pressure form of CuMo0.9W0.1O4(γ‐phase, red‐brown) to the low‐temperature/high‐pressure form (α‐phase, green) is induced at 25 °C by simple immersion of the powder in an acidic aqueous solution.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.