Fabrication, microstructures, luminescent and magnetic properties of LiFe(WO sub(4)) sub(2) microcrystals

Monoclinic LiFe(WO sub(4)) sub(2) microcrystals have been fabricated by solid-state ceramic method. Microstructures, luminescent and magnetic properties of the as- fabricated microcrystals were characterized by X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy and Vibrating Sample Magnetometer. Influence of sintering temperature and sintering time on the microstructures, luminescent and magnetic properties of LiFe(WO sub(4)) sub(2) microcrystals were studied. Below the sintering temperature 800 degree C, the prepared samples exhibited spherical-like morphology. The crystallinity and purity of the microcrystals increased with increasing the sintering temperature. At higher 800 degree C, the observed morphology of the obtained microcrystalline turned to be rods-like. All the LiFe(WO sub(4)) sub(2) microcrystals exhibit the alike broad emission peak centered at 390 nm under excitation of 242 nm ultraviolet light except for difference in emission intensity. Due to the good crystallinity and microstructures, LiFe(WO sub(4)) sub(2) microcrystals fabricated at 800 degree C possess the maximum emission intensity. On the premise of the optimal sintering temperature (800 degree C) and the predetermined range of sintering time (1-9 h), the sintering time has little influence on the microstructures and luminescent properties of the LiFe(WO sub(4)) sub(2) microcrystals. In addition, all the well crystallized LiFe(WO sub(4)) sub(2) microcrystals exhibit paramagnetism at room temperature.