Investigation of heating rate effect on solid-phase interaction in Li2CO3 - Fe2O3 reaction mixture

International Scientific Conference on "Radiation-Thermal Effects and Processes in Inorganic Materials"

材料科学;物理学

Lysenko, E.N.^1 ; Nikolaev, E.V.^1 ; Vasendina, E.A.^1

National Research Tomsk Polytechnic University, 30 Lenin Ave, Tomsk

634050, Russia^1

关键词: Endothermic effects;    Ferrite synthesis;    Heating rate effect;    High heating rates;    Reaction mixture;    Solid phase interaction;    Thermal analyzers;    Thermal heating;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/81/1/012104/pdf
DOI  :  10.1088/1757-899X/81/1/012104

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The influence of heating rate on solid-phase interaction in Li2CO3- Fe2O3reaction mixture was investigated by thermal analysis method. The powder mixture components were in the ratio corresponding to LiFe5O8ferrite. The ferrite synthesis was performed by thermal heating of mixture reagents in thermal analyzer up to 800 °C in air at various heating rates in the ranges (5-50) °C/min. The results showed that the heating rate affects the solid-phase interaction in Li2CO3- Fe2O3reaction mixture. The reaction phase formation is accompanied by heat endothermic effect, which was observed in the DSC curve in the form of a complex broad peak. For all samples, this complex peaks were decomposed into simpler peaks, and thereby, the enthalpies of the individual phase transitions were determined. It was shown that the heating rate affects the values of enthalpy and temperatures of heat endothermic effects, so that the high heating rate shifts the proceeding of reaction to higher temperatures.