Abstract
The direct synthesis of new and metastable materials and the control of physical properties of solids can be achieved at low temperatures by reversible electron/ion transfer reactions. The present article deals with the understanding of the mechanisms of these reactions. The following aspects are covered: (i) electron/anion transfer processes and host matrix charge sign conversion of layered oxide systems; (ii) isothermal magnetic phase transitions controlled by quenching and generation of anion p band holes in chalcogen spinels; (iii) control of the transition temperature of perovskite-type high-temperature superconductors and (iv) a mechanism for the high oxygen mobility in the latter phases based on a “critical valence state” model involving internal redox equilibria of cation and anion band holes.
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