Abstract

THE PREPARATION, CHARACTERIZATION AND ELECTRICAL PROPERTIES OF SODIUM-BASED DIPHOSPHATES AND DIARSENATES

Dr. Masheir Ebrahim Baleil, Dr. Mohammed Salem Abd Elfadil

Abstract

This study aims to prepare to substitute lithium cation by sodium ions as cathode in rechargeable ion-batteries. Particularly, new materials in the Na-M -As-O systems (M= transition metal) was synthesized by solid-state reaction route or sol-gel process. X-ray diffraction was used to determine the crystal structure of each compound. In order to obtain Na2MX2O7 dense ceramics, the optimal sintering temperature was determined. Their microstructure of Na-M- As-O was characterized by scanning electron microscopy. Electrical measurements were carried out using impedance spectroscopy. In theoretical studies, the bond valence site Maps (BVSM) model or Bond Valence Site Energy (BVSE) was used to simulate the conduction pathways of the monovalent cations, allowing a better correlation between the electrical properties and structure.

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