Combined effects of Mg reducing and Sn doping on the electrical conductivity of polycrystalline Ca12Al14O33 mayenite
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Polycrystalline Ca12Al14O33 was prepared by a solid state reaction method. All samples showed the phase of the Ca12Al14O33 by X-ray powder diffraction (XRD). The Mg heat treatment and Sn doping contributions dominated to increase the lattice constant a from 11.909(3) to 12.163(1) Å. Electron excitation energy of all samples were assigned by absorption spectra. The excitation energy between 2.68 and 2.79 eV was found after the Mg heat treatment. Electrical conductivity increased approximately 109 orders of magnitude at room temperature when experiencing Mg heat treatment for 10 h. The highest electrical conductivity obtained from the Ca12Al12.8Sn1.2O33/Mg(10) sample was 7.65 S cm− 1 at 573 K. The low activation energy for electrical conductivity was approximately 0.038 eV as a result of the Mg heat treatment. The influence of the Sn doping excellence supported the increase of the electrical conductivity with the Mg heat treatment process.
Author would like to thank the Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang (KMITL) for funding our research grant [grant number: 2562-01-05-50].
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