Shape-selected synthesis, characterization and optical properties of KMnF3 micropolyhedra, microspheres and hollow microspheres

Micropolyhedra, microspheres and hollow microspheres of the cubic KMnF3 were selectively prepared by controllable, hydrothermal method at 120 degrees C. Manganese acetate and potassium fluoride were employed as the starting materials in the reaction, and variety of polyethylene glycol and dosage of citric acid were demonstrated to be responsible for the shape evolution. The samples were characterized by Xray diffraction, scanning electron microscopy, X-ray photoelectron spectra, UV-vis absorption spectroscopy and photoluminescence spectra. A possible mechanism for the growth of KMnF3 microcrystal was proposed. (C) 2009 Elsevier B.V. All rights reserved.