Sub-Solidus Synthesis and Microwave Dielectric Characterization of Plagioclase Feldspars

NaxCa1� xAl2� xSi21xO8 plagioclase solid solutions (0rxr1) were synthesized under sub-solidus conditions using a solid-state reaction technique. The plagioclase formation and the sintering temperature decreased with an increase in x from the anorthite (CaAl2Si2O8; x 5 0) to the albite (NaAlSi3O8; x 5 1). Microwave (MW) dielectric measurements revealed that