Low loss dielectrics of Ba_6Ti_2Ta_8O_(30) and Sr_6Ti_2Ta_8O_(30) with tungsten-bronze structure

摘要

The dielectrics of Ba_6Ti_2Ta_8O_(30) and Sr_6Ti_2Ta_8O_(30) were prepared and characterized. These compounds have the tetragonal tungsten-bronze structure and paraelectric nature at room temperature. Very low dielectric loss was determined at 1 MHz in both dielectrics together with a relatively small temperature coefficient. The dielectric constant was 174 and 180 for Ba_6Ta_8O_(30) and Sr_6Ti_2Ta_8O_(30), respectively.