Dielectric material and process for producing the same

摘要

A dielectric material based on BaO-RE2O3-TiO2 is disclosed, which has a relatively high relative permittivity epsilon r, a small absolute value of the temperature coefficient of resonance frequency tau f and a high coefficient of unloaded quality Qu. Processes for producing the dielectric material are also disclosed. The dielectric material comprises 100 parts by weight of main ingredients having a composition represented by xBaO-yRE2O3-zTiO2 (wherein RE represents a rare earth element and x+y+z=100) and up to 5 parts by weight of at least one alkali metal oxide. This alkali metal oxide serves to improve epsilon rand Qu without a considerable sacrifice of tau f. The RE preferably consists of samarium or a combination of samarium with neodymium and/or lanthanum. In producing the dielectric material, a dense sintered body can be obtained without fail by using a raw material containing hydroxyl groups as a starting material for the rare-earth ingredient among the main ingredients.