Transformation Mechanism of Fluormica to Fluoramphibole in Fluoramphibole Glass Ceramics

Abstract EN

During isothermal sintering at 820°C, the transformation mechanism of fluormica to fluoramphibole in powder compacts of fluormica and soda-lime glass was investigated using differential thermal analysis, infrared reflection spectrometry, X-ray diffraction, scanning electron microscopy, and so forth.

Results show that an interaction between fluormica and glass occurred during isothermal heating; O2−, Na+, and Ca2+ ions were diffused from glass to fluormica.

This diffusion facilitates the transformation of the sheet structures of fluormica crystals to double-chain structures by the breakage of bridge oxygen bonds in the sheet.

Subsequently, the broken two parallel double chains were rearranged by relative displacement along the c -axis direction of the fluormica crystal and were linked by Na+ and Ca2+ ions to form fluoramphibole.

A crystallography model of fluormica-fluoramphibole transformation was established in this study.