Crystal structure and ion-ion correlation in ion-rich β alumina type compounds. II. potassium β ferrite
Abstract The crystal structure analysis of βK ferrite (Fe10.92K1.55O17) refined to an R factor of 5.07% shows that the compensation mechanism for non-stoichiometry (y = 0.55) is achieved simultaneously by large deficiencies in the spinel blocks and by Fe2+ ions. The ion-ion correlation studied by X-ray diffuse scattering is analysed using a mixture of two models of short range order corresponding respectively to the type of order observed previously for stoichiometric β alumina and ion rich Mg2+ doped potassium β alumina.