Structural and electrical properties of Mg2TiO4

Abstract

We have studied the structural and electrical properties of Mg 2TiO4 inverse spinel using X-ray diffraction, Raman spectroscopy, ac conductivity and dielectric spectroscopy. Polycrystalline sample of Mg2TiO4was prepared by the conventional solid state reaction technique. Powder X-ray diffraction analysis indicates single phase nature of inverse spinel Mg2TiO4. Raman study also infers that Mg2TiO4 exhibits inverse spinel structure. The dielectric constant measured as a function of frequency exhibits a resonance peak at 9 MHz. The dielectric constant measured as function of temperature (100-300 K) at 500 kHz is found to increase with temperature. The value of the loss tangent (tanσ) was found to be small ~ 0.01 through out the whole temperature range. The value of the exponent (s), evaluated using the power law ac =, is found to be ~1, which indicates the good correlation of the hoping of carriers in the system. © 2009 The Ceramic Society of Japan. All rights reserved.