Structure and Microwave Dielectric Properties of MgTiO3-Na0.5Nd0.5TiO3 Ceramic Bodies
The effect on the microwave dielectric properties of MgTiO3 ceramics after addition of Na0.5Nd0.5TiO3 (i.e. MT-NNT) was investigated. Increasing the proportion of Na0.5Nd0.5TiO3 and raising the sintering temperature greatly affect the density of the material. The maximum density (∼4.40 g/cm3) was obtained with MT-NNT ceramic bodies sintered at 1300°C for 4 h. The microwave dielectric properties, crystalline phases and microstructure development can be effectively controlled by varying the MT-NNT ratio. The best combination of microwave dielectric characteristics was obtained for MTNNT50 ceramics (1:1 MT-NNT ratio) sintered at 1300°C for 4 h. It had dielectric constant εr = 38 and quality factor Q×f ∼ 180,000 GHzat 18 GHz. This is attributed to the high amount of (Na0.5Nd0.5)TiO3 (orthorhombic) crystalline phase present in the body.
KeywordsMgTiO3 NdO2 NaO microwave dielectric properties X-ray diffraction
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