Abstract
Effects of compositions on the microwave dielectric properties of the MgO-TiO₂ system were investigated as a function of the molar ratio of MgO to TiO₂ (0.9≤MgO/TiO₂ (x)≤1.2). With the compositional changes, secondary phases of MgTi₂O? and Mg₂TiO₄ were also detected along with MgTiO₃. Microwave dielectric properties of the specimens were dependent on the types of phases developed in the sintered specimens. A single phase of MgTiO₃ showed a dielectric constant (K) of 18.2, a quality factor (Qf) of 198,000 ㎓, and a temperature coefficient of resonant frequency (TCF) of ?51 ppm/℃. However, the dielectric properties of the specimens with a secondary phase of MgTi₂O? (K=19.9, Qf=48,000 ㎓) and/or Mg₂TiO₄ (K=15.6, Qf=56,000 ㎓) were worsened. Dependence of the microwave dielectric properties on the secondary phase of the MgO-TiO₂ system was also discussed in terms of dielectric mixing rules.
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