Synthesis and microwave electromagnetic property of LaMnO3 nanocrystalline

摘要

The perovskite-type nanocrystal LaMnO3 was prepared using a sol-gel auto-combustion method with citric acid as the chelating agent. The metal ions coordination compound, obtained from nitrate and citrate, underwent an auto-combustion process and voluminous ashes formed when calcining the complex in the air. Some analytical methods consisted of FT-IR, XRD and wave-guide were used to characterize the gel and the final products. It was shown that metal ions and carboxyl were combined to form a homogeneous organic complex base salts in the process of gelation. The nanocrystalline had dielectric loss in the microwave frequency range of measurement. With the increasing of thickness, the reflectivity of perovskite-type nanocrystalline increased and absorption peak shifted to lower frequencies. The size of the nanocrystalline affected electromagnetic absorption.