Phase microstructure evaluation and microwave dielectric properties of (1- x)Mg _0.95Ni _0.05Ti _0.98Zr _0.02O ₃– xCa _0.6La _0.8/3TiO ₃ ceramics

Abstract

All the compositions in the (1− x)Mg _0.95Ni _0.05Ti _0.98Zr _0.02O ₃– xCa _0.6La _0.8/3TiO ₃ (0 ≤ x ≤ 0.2) series were fabricated using solid state sintering route. Mg _0.95Ni _0.05Ti _0.98Zr _0.02O ₃ possessed excellent microwave dielectric properties with ${\epsilon }_{\text{r}}$ ≈ 17.1, $Q_{\text{u}}{f}_{\text{0}}$ ≈ 195855 GHz, and ${\tau }_f$ ≈ -46 ppm/℃. ${\tau }_f$ was tuned through zero by mixing with Ca _0.6La _0.8/3TiO ₃. In the present study, ${\tau }_f$ ≈ -2 ppm/℃ with ${\epsilon }_{\text{r}}$ ≈ 23.9 and high $Q_{\text{u}}{f}_{\text{0}}$ ≈ 115870 GHz was achieved for x = 0.15, i.e., for a mixture of 85% Mg _0.95Ni _0.05Ti _0.98Zr _0.02O ₃ and 15% Ca _0.6La _0.8/3TiO ₃.