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Soluble potassium has been successfully extracted from biotite by Sr2+/K+ ion exchange. The hydrated Sr-mica after ion exchange has better electrochemical properties. The potassium extraction rate, mica silicate structure and electrochemical properties (charge-discharge and cycling properties) before and after ion exchange were characterized by X-ray fluorescence spectroscopy, powder X-ray diffraction, Fourier Transform Infrared spectrometer and constant current charge-discharge cycle technology. The results show that after 10 hours of strontium ion exchange, the layered silicate structure is not destroyed. The maximum potassium extraction rate is 98%. The biotite gradually transforms into vermiculite strontium mica to form strontium mica, and the basal (001) spacing expands from 1.001 nm to 1.517 nm. The electrochemical properties of hydrated Sr-mica obtained after exchange have been improved.

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In this paper,a sol-gel method using tetrabutyltitanate as titanium source was adopted to coat a TiO 2 layer on the surface of Y 3 Al 5 O 12 :Ce 3+ (YAG) phosphor. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to analyze the phase and surface morphology of the phosphor. XRD and SEM analysis showed that the surface of YAG phosphor was successfully coated by TiO 2 . 1