“…Compositions like K2Mo3O10 [17], 2Na2O-MoO3 composite [18], Li3FeMo3O12 [19], Li8Bi2Mo7O28 [20], Te2Mo0.95W0.5O7 [21], Pb2WO5 [22], Li3BiMo3O12 [20], Li0.5Ce0.5MoO4 [23], (RbBi)0.5MoO4 [24], BaTe4O4+40 wt.% TiTe3O8 [25], (AgBi)0.5(MoW)0.5O4 [26], (AgBi)0.5WO4 [27], and (LiBi)0.5MoO4 [20] have the sintering temperature in the range of 500-600 ̊C , the relative permittivity (r) of 5.6-45, the quality factor (Qf) of 300-36 000 GHz and the temperature coefficient of resonant frequency (f) of -115 to 228 ppm/ ̊C have been reported. However, the ULTCC ceramics with good microwave properties are limited in number so far and from the practical applications point of view, further research is needed.…”