Improved sintering characteristics and microwave dielectric properties of NdNbO₄ ceramic system

Improvements in the sintering behavior and microwave dielectric properties of fergusonite-type NdNbO4 ceramics

“…These materials have many exceptional characteristics making them promising in applications as multi-functional materials. Among them, the NdNbO 4 ceramic with high quality factors, and an appropriate dielectric constant, became a type of well-known dielectric ceramic promisingly used as resonators, filters and antennas for communication operating at millimeter wave frequencies [4] and more recently, much attention has paid to research on its microwave dielectric properties [5][6][7][8]. For example, Kim reported that it possessed the quality factor Qf of 33,000 GHz, dielectric constant ε r of 19.6, and temperature coefficients of the resonant frequency τ ƒ of 24 ppm/1C [4].…”

Synthesis and microwave dielectric properties of new high quality Mg2NdNbO6 ceramics

“…However, due to the extension to the higher frequency in communication system, the quality factor Q 9 f of 33 000 GHz of NdNbO 4 ceramics is relatively low and cannot be widely used in microwave communication. Zhang et al [2][3][4][5][6][7][8][9] have optimized the sintering behavior and microwave dielectric properties of NdNbO 4 in the way of doping with CaF 2 , CaTiO 3 , MnCO 3 , CuO, La 2 O 3 , Ta 2 O 5 , Al 2 O 3 , and Sm 2 O 3 . Also, a follow-up work 10 investigated the microwave dielectric properties of (Nd 0.97 Mn 0.045 )Nb 0.988 O 4 by adjusting the substitution of La 3+ content.…”