Sintering behavior and microwave dielectric properties of the Zr1-x (Zn1/3Nb2/3)xTiO₄system with zinc-borosilicate glass

Sintering behavior and microwave dielectric properties of the Zr1-x (Zn1/3Nb2/3)xTiO₄system with zinc-borosilicate glass

The sintering behavior and microwave dielectric properties of the Zr1-x(Zn1/3Nb2/3)xTiO₄ (x = 0.4 and 0.6)-ZBS glass system were investigated with a view to applying the composition to low temperature co-fired ceramic technology. The addition of 25wt% ZBS glass ensured successful sintering below 925oC. Except an α-PbO2 type ZrTiO₄ solid solution, TiO₂ and monoclinic ZrO₂ were formed for the composition with x = 0.4 whereas Zn1/3Nb2/3TiO₄ was observed for x = 0.6. In addition, α-Zn₂SiO₄ and ZnB₂O₄were crystallized from the zinc borosilicate glass. Non-reactive liquid phase sintering (NLPS) occurred and a onestage sintering was conducted. The dieledtric constant was affected by the densification, i.e., the porosity and it obeyed the logarithimc mixing rule. Zr0.4 (Zn1/3Nb2/3)0.6TiO₄ with 25wt% ZBS glass sintered at 925oC gave 27.7 as the dielectric constant (εr), 3,850 GHz in as the Q×f value, and +6.1 ppm/oC as the temperature coefficient of resonant frequency (τf).

The sintering behavior and microwave dielectric properties of the Zr1-x(Zn1/3Nb2/3)xTiO₄ (x = 0.4 and 0.6)-ZBS glass system were investigated with a view to applying the composition to low temperature co-fired ceramic technology. The addition of 25wt% ZBS glass ensured successful sintering below 925oC. Except an α-PbO2 type ZrTiO₄ solid solution, TiO₂ and monoclinic ZrO₂ were formed for the composition with x = 0.4 whereas Zn1/3Nb2/3TiO₄ was observed for x = 0.6. In addition, α-Zn₂SiO₄ and ZnB₂O₄were crystallized from the zinc borosilicate glass. Non-reactive liquid phase sintering (NLPS) occurred and a onestage sintering was conducted. The dieledtric constant was affected by the densification, i.e., the porosity and it obeyed the logarithimc mixing rule. Zr0.4 (Zn1/3Nb2/3)0.6TiO₄ with 25wt% ZBS glass sintered at 925oC gave 27.7 as the dielectric constant (εr), 3,850 GHz in as the Q×f value, and +6.1 ppm/oC as the temperature coefficient of resonant frequency (τf).