Ceramics-Silikáty 54 (4) 352-356 (2010)

GLASS FORMATION REGION OF THE LITHIUM IRON PHOSPHATE TERNARY SYSTEM AND THE PROPERTIES OF OBTAINED GLASSES

R. Yang , Y. Wang , Y. Chen , X. Hao , J. Zhan , S. Liu

The glass formation region of the lithium iron phosphate ternary system was determined with the help of XRD and optical microscope analysis. Nine Li₂O–Fe₂O₃–P₂O₅ ternary glasses with compositions inside the glass formation region were prepared. Glass transition temperature and crystallization tendency of the glasses were analyzed by DTA. Density and water resistance of the glasses were measured based on the Archimedes principle and the weight loss of the glass particles after being boiled in water, respectively. The results show that the increase in the amount of either Li₂O or Fe₂O₃ (decrease of P₂O₅) results in the increase in the glass density and the decrease in the glass transformation temperature. The chemical stability of the glasses is increased, while the crystallization tendency is reduced with increased amounts of Fe₂O₃. However, glasses with more Li₂O have a stronger tendency to crystallize and are generally less resistant to water attack.

Keywords: LiFePO₄ glass, Glass formation region, Density, Chemical stability, Crystallization tendency