Evaluation of electronic state of Mg4(Nb2−xSbx)O9 microwave dielectric ceramics by first principle calculation method

Microwave dielectric properties of MgTiO3-based ceramics

“…Also, the MZTS showed the highest bond strength (s Ti ) between the Ti 4 þ cation and oxygen ion in the TiO 6 octahedra. Covalent bonding characteristics could be associated with high bond strength, which could lead to a decrease in the intrinsic loss in ceramics [19,20].…”

Improvements in the sintering behavior and microwave dielectric properties of Mg4Nb2O9 by adding Fe2O3

“…Several corundum-structured A 4 B 2 O 9 (A = Co and Mg, B = Nb and Ta) had been reported due to their excellent microwave dielectric properties [1,[9][10][11][12][13]. Among these materials, Mg 4 Nb 2 O 9 was investigated to possess a dielectric constant ε r of ∼12.4, a temperature coefficient of resonant frequency f of ∼−70 ppm/ • C and in particular, a high Q × f of ∼194,000 GHz [13].…”

Intrinsic factors affecting the microwave dielectric properties of Mg2Ti1−(Mg1/3Sb2/3) O4 ceramics

“…Volume of M-site = 16/3 3 (3/8 − ) 2 (8) This volume and the corresponding packing fraction of the M-site were calculated using the refined values for a and u of the specimens. Although the volume of the M-site increased with increasing x, the packing fraction increased due to the larger size of (Mg 1/3 Sb 2/3 ) 4+ compared to that of Ti 4+ .…”