Non-isothermal crystallization kinetics of some aventurine decorative glaze

摘要

Non-isothermal crystallization of hematite in an aventurine glaze was investigated using DTA technique. The apparent activation energy as a function of the crystallized fraction was evaluated by the Kissinger–Akahira–Sunose (KAS), Ozawa–Flynn–Wall (OFW), Starink, Tang, and Vyazovkin isoconversional methods. The apparent activation energy of the hematite crystallization in the studied aventurine glaze ranges with the crystallization fraction between 150 and 180 kJ mol−1. The Avrami exponent values, calculated by Ozawa method confirm the complex mechanism of the crystallization process.