Structure-inheriting solid-state reactions under hydrothermal conditions

Abstract

We have explored several structure-inheriting solid-state reactions (SISSRs) under hydrothermal conditions for syntheses in the Co-Mo-O system. And we found an interesting hydrothermal SISSR from CoMoO 4. 3/4H 2 O to high-pressure (hp-) phase of CoMoO 4 , which enabled us to considerably reduce the severe conditions for the synthesis of hp-CoMoO 4 . As similar hydrothermal SISSRs are expected to be useful tools for material syntheses, we also briefly discuss them as a means of developing novel material syntheses and designs.

Mechanism and kinetics of pseudomorphic mineral replacement reactions: A case study of the replacement of pentlandite by violarite

“…The role of fluids in pseudomorphic reactions has traditionally been greatly underestimated, and replacement reactions have mainly been considered in terms of diffusiondriven movement of cations within a solid (e.g., Thornber, 1975a;Cole, 1983;Wilkin and Barnes, 1996;Cole and Chakraborty, 2001;Eda et al, 2004Eda et al, , 2006Hunger and Benning, 2007). This mechanism involves the preservation of the anionic structural framework, while cations appear to freely interchange through larger atomic sites or interconnected channels within the structure (Harland, 1994).…”

Solvothermal and hydrothermal processes: the main physico-chemical factors involved and new trends

“…If one of the reactants remains in the solid state under solvothermal conditions (in particular for low-temperature synthesis), it becomes possible to initiate the structure of the final product through one of the insoluble reactants. Such a solvothermal route was called ''structure-inheriting solid-state reaction'' by Whittingham and coworkers [114]. The effect of the reaction time during the synthesis of CoMoO 4 through a solvothermal process (using water as solvent) was investigated at 453 K using MoO 3 and CoO as precursors.…”

Review. Solvothermal Processes: Definition, Key Factors Governing the Involved Chemical Reactions and New Trends

“…Such a solvothermal route was called "structure-inheriting solid-state reaction" by Whittingham [33]. The synthesis of CoMoO 4 through a solvothermal process (using water as the solvent) was investigated as a function of the reaction time using …”