Structural and Dielectric Properties of Mg(1-x)CaxTiO3 (x=0.7, 0.8) Ceramic Materials

Abstract

Calcium Magnesium titanate ceramic materials with the molar formula Mg(1-x)CaxTiO3 in which the x varies from 0.7 to 0.8 were synthesized by conventional Solid State Reaction method. The XRD pattern revealed that the samples exhibit Orthorhombic structure. The microstructure and surface morphology for the samples was studied by SEM. The elemental composition was studied by EDAX. The dielectric response of both samples was measured by HIOKI 3532-50 LCR HiTESTER in the frequency range of 1KHz-1MHz from room temperature to 350 0 C. These samples find applications in capacitors, microwave antennas, stainless steel electrodes and data storage devices. Introduction. Over more than 200 years, Ceramic materials are known for technical applications. To overcome the limitations of other conventional materials, various special tailored ceramics are developed with novel chemical, electrical, biological and mechanical properties. In the last three decades there has been a phenomenal transformation in microwave communication systems such as mobile telecommunication systems, satellite communication and broadcasting systems, and global positioning systems. The rapid development in microwave communication systems was made possible with the use of dielectric ceramics as enabling materials for resonators, filters and other key components in microwave components. For these applications the ceramic materials are required to have a high relative permittivity (er), low dielectric loss, and near zero temperature coefficient of resonant frequency (τf). The combination of these requirements greatly restricts the ceramic dielectrics available for applications in microwave systems [1].