“…Among them, Ba(Zn 1/3 Nb 2/3 )O 3 -Ba(Co 1/3 Nb 2/3 )O 3 (BZN-BCN, BCZN) with high quality factor (Q 9 f) value, adjustable temperature coefficient of resonant frequency (s f ), comparatively cheap price of Nb 2 O 5 , and low sintering temperature is highlighted [1,[4][5][6]. The microwave dielectric properties of BZN is e r = 41.0, s f = 30 ppm/°C [7], whereas that of BCN is e r = 32.0, s f = -12 ppm/°C [8], suggesting that the e r and s f can be varied by changing the composition.Then it is well recognized that the high Q 9 f achieved in these complex perovskites is mainly connected with the 1:2 ordered hexagonal structure [3,4,9,10]. The low loss values are obtained when the samples exhibit high ordered degree [3,11].…”