Low-firing and temperature stable microwave dielectric ceramics: Ba2LnV3O11 (Ln=Nd, Sm)

Low-firing and temperature stable microwave dielectric ceramics of Ba(2)LnV(3)O(11) (Ln=Nd, Sm) were prepared by solid-state reaction. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the phase purity, crystal structure, sintering behavior, and microstructure. The XRD patterns indicated that Ba(2)LnV(3)O(11) (Ln=Nd, Sm) ceramics belong to monoclinic crystal system with P2(1)/c space group in the whole sintering temperature range (800 degrees C -900 degrees C). Both ceramics could be well densified at 880 degrees C for 4hours with relative densities higher than 96%. The Ba(2)LnV(3)O(11) (Ln=Nd, Sm) samples sintered at 880 degrees C for 4hours exhibited excellent microwave dielectric properties: epsilon(r)=12.05, Qxf=23010GHz, (f)=-7.7ppm/degrees C, and epsilon(r)=12.19, Qxf=27120GHz, (f)=-16.2ppm/degrees C, respectively. Besides, Ba(2)LnV(3)O(11) (Ln=Nd, Sm) ceramics could be well co-fired with the silver electrode at 880 degrees C.