研究目的
To synthesize the double perovskite La2CrMnO6 ceramics via the standard high-temperature sintering and to determine the correspondences between the crystal lattice structure order, the chemical composition, the electric permittivity, and conductivity of the La2CrMnO6 ceramics.
研究成果
La2CrMnO6 ceramics exhibited disordered orthorhombic Pbnm structure and multiple ionic states of Mn and Cr ions. The conductivity at high temperatures was attributed to the nearest neighbor hopping of small polarons, while at low temperatures, the variable range hopping mechanism was consistent with the Fermi glass model. The high-temperature sintering route was effectively applied to produce the La2CrMnO6 ceramics, though further technology efforts are needed to reduce porosity.
研究不足
The study is limited by the high porosity level of the ceramics, which may affect the electrical properties, and the presence of a minor phase precipitate, whose influence on the electrical features was not analyzed.
1：Experimental Design and Method Selection:
The La2CrMnO6 ceramics were synthesized using conventional solid state reaction method. The oxides La2O3, Cr2O3, and MnO2 were taken in stoichiometric amounts as primary raw materials. The powder chemicals were mixed, milled, calcined, pressed into pellets, and sintered at high temperatures.
2：Sample Selection and Data Sources:
The samples were characterized using X-ray powder diffraction, scanning electron microscopy, energy dispersion X-ray spectrometer, X-ray photoelectron spectroscopy, and impedance measurements.
3：List of Experimental Equipment and Materials:
PANalytical PW1050 diffractometer, SEM JSM-5410 equipped with an energy dispersion X-ray spectrometer, Physical Electronics Spectrometer PHI 5600, Wayne Kerr 4300 LCR meter.
4：Experimental Procedures and Operational Workflow:
The samples were prepared, characterized, and their electrical properties were measured in frequency and temperature ranges.
5：Data Analysis Methods:
The data were analyzed using Fullprof software suite for XRD, SEMQUANT program for SEM, and various models for electrical properties analysis.
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