We investigated the phase evolution, microstructure, and microwave dielectric properties of Na- and Zr-doped Ba(Mg_0.5W_0.5)O₃ [i.e., (Ba_1-2xNa_2x)(Mg_0.5-xZr_xW_0.5)O₃] ceramics. BaWO₄ as a secondary phase was observed in all compositions, and it increased as the dopant concentration increased. All specimens revealed a dense microstructure. For the composition of x=0.01, polyhedral grains were observed. As the dopant concentration increased, the densification and the grain growth were promoted by a liquid phase. The quality factor(Q×f₀) decreased remarkably, whereas the dielectric constant (ε_r) tended to decrease as the dopant concentration increased. The dielectric constant, quality factor, and temperature coefficient of the resonant frequency of the composition of x=0.01 sintered at 1,700℃ for 1 h were 18.6, 216,275 GHz, and -22.0 ppm/℃, respectively.

Citations

• Structural, microstructural, opto-electronic and dielectric studies of Ba(Mg1-xZnx)1/2W1/2O3 (0.00 ≤ x ≤ 0.40) ceramics for dielectric resonators application
  Farhan Ullah, Asad Ali, Tanveer Ahmad, Salhah Hamed Alrefaee, Hala Siddiq, Farkhod Rakhmonov, Naseem Akhter, Vineet Tirth, Ali Algahtani, Abid Zaman
  Ceramics International.2026; 52(16): 31004.     CrossRef