Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

Abstract

La 2/3 Ca 1/3 MnO 3 polycrystalline ceramics were synthesized by sol-gel method. Sharp temperature coefficient of resistance (TCR) variation (with peak value up to 22 %) has been observed near the metal-insulator transition temperature T MI (273 K) for the sample sintered at 1,450°C. This TCR value is much higher than the previously reported values for the undoped and Ag-doped La 0.67 Ca 0.33 MnO 3 samples and is comparable to the optimized thin films. It was concluded that the improved physical properties of the La 0.67 Ca 0.33 MnO 3 material are due to its improved microstructure and homogeneity.

Near‐net shape manufacture of macroporous nanosized alumina monolith by aqueous gel casting method

“…The higher temperature leads to lattice expansion, which will drive the peak shift to lower angle due to a decrease in an internal strain of the lattice. Such a conclusion is in good agreement with those reported in the literature 47,48 …”