Synthesis, characterization and thermal expansion of Cr 2− xTi xO 3+ δ

Abstract

Cr 2− x Ti x O 3+ δ , where x varies from 0.1, 0.2 and 0.3 has been prepared by glycerol route and characterized by powder X-ray diffraction, dynamic light scattering, BET surface area and scanning electron microscopy. The thermal expansion coefficient of the powder samples was studied using a high-temperature X-ray diffractometer. The bulk thermal expansion was studied by dilatometry. An anomaly in the ‘ c’ direction was found initially in the Ti doped samples which manifested in ‘ a’ direction as well at high dopant concentration. The anomalies shown by these compounds could not be manifested in the bulk thermal expansion because of the polycrystalline nature of the samples as revealed by dilatometry.