High-temperature XRD investigation of spinel Mn_(1.5)Al_(1.5)O_4 decomposition

摘要

This article describes a study of behaviour of cubic Mn_(1.5)Al_(1.5)O_4 spinel during heating and cooling under air. High-temperature XRD and TEM were used to investigate structure transformations and sample microstructure. XRD data show spinel decomposition during cooling and heating under air at 500-700°C. The products of decomposition consist of nanocrystalline tetragonal phase (with particle size of 20 nm) and cubic spinel (50 nm). Cu bic spinel composition changes by various ways on the initial step during the heating and cooling. Thus, the structure mechanisms of decomposition are different. But the final de composition products are the same.