Mg-doped barium tantalate

The rapid progress in mobile and satellite communication system has created a high demand for the development of microwave dielectric materials with a high quality factor, an appropriate dielectric constant, and a near-zero temperature coefficient of resonant frequency. Several corundum-structured A4B2O9 ceramics have been found due to their excellent microwave dielectric properties, and 

The powders were then mixed with polyvinyl alcohol as a binder and were granulated. The granulated powders were pressed into cylindrical disks of 10 mm diameter and about 5 mm height at a pressure of about 200 MPa. These pellets were preheated at 600 °C for 4 h to expel the binder and then sintered at selected temperatures for 4 h in air at a heating rate of 5°Cmin .  

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