Phase Constitutions and Microwave Dielectric Properties of Zn_3Nb_2O_8-TiO_2 : Electrical Properties of Condensed Matter

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The phase constitutions and microwave dielectric properties of (1 - x)Zn_3Nb_2O_<8-x>TiO_2 Were investigated using X-ray powder diffraction and a network analyzer, respectively. Four mixture regions were studied with increasing TiO_2 content (x): (1) Zn_3Nb_2O_8, ZnNb_2O_6, and Zn_2TiO_4, (0 < x 〓 0.5) (2) ZnNb_2O_6 and Zn_2TiO_4, (0.5 < x < 0.65) (3) Zn_2TiO_4, ZnTiNb_2O_8, and TiO_2 (0.65 〓 x 〓 0.75), (4) Zn_2TiO_4 and TiO_2 (0.75 < x < 1). This structural evolution with composition was ascribed to the interrelations between Zn_3Nb_2O_8 and TiO_2. It was demonstrated that the microwave dielectric properties correlated to crystal structure rather than chemical composition. In the mixture region of Zn_2TiO_4, ZnTiNb_2O_8, and Zn_2TiO_4, the amount of TiO_2 and ZnTiNb_2O_8 considerably increased and decreased, respectively, with increasing TiO_2 content (x). This resulted in the increase of relative dielectric constant (ε_r) and temperature coefficient of resonant frequency (τ_f). At x = 0.725. Q x f is 5190 GHz, ε_r andτ_f are 36 and 4 ppm/℃, respectively.
社団法人応用物理学会の論文
2001-10-15