Citrate combustion synthesized Al-doped CaCu3Ti4O12 quadruple perovskite: Synthesis, characterization and multifunctional properties
The facile synthesis of Al-doped CaCu3Ti4O12 quadruple perovskite, a well-known and vastly studied material for various technological applications, using modified citrate combustion route along with the structural, microstructural, and X-ray photoelectron spectroscopic (XPS) characterizations and magnetic, dielectric and electrical properties have been investigated and reported here. The possible applications of the material as Schottky barrier diode (SBD) in optoelectronic devices and as a catalyst in methanol steam reforming (MSR) reaction for hydrogen generation, hitherto unreported in the open literature, have also been explored. The compound is crystallized in cubic body centered Im-3 space group and the particle size is found to be in nanodimension with rather narrow size distribution. The enhanced resistivity could be attributed to the grain boundary effect and consequently, it exhibits better performance as SBD compared to the undoped sample. Desired cationic composition with expected valence states within the probe range is confirmed by the XPS analysis. A better catalytic activity towards MSR is noticed for the Al-doped CaCu3Ti4O12 compared to the undoped composition. These new findings, namely MSR activity and applicability in Schottky device have highlighted further the multifunctional nature of the material in energy related issues and would thus be of interest to the materials community searching for functional materials.