Low loss Sr1−xCaxLa4Ti5O17 microwave dielectric ceramics |
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Authors: | Yaseen Iqbal Abdul Manan I.M. Reaney |
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Affiliation: | a Materials Research Laboratory, Institute of Physics & Electronics, University of Peshawar, Post Code 25120, Pakistan b Department of Materials Science and Engineering, Sir Robert Hadfield Building, University of Sheffield, S1 3JD, UK |
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Abstract: | Microwave dielectric ceramics in the Sr1−xCaxLa4Ti5O17 (0 ≤ x ≤ 1) composition series were prepared through a solid state mixed oxide route. All the compositions formed single phase ceramics within the detection limit of in-house X-ray diffraction when sintered in the temperature range 1450-1580 °C. Theoretical density and molar volume decreased due to the substitution of Ca2+ for Sr2+ which was associated with a decrease in the dielectric constant (?r) and temperature coefficient of resonant frequency (τf) but an increase in quality factor, Qfo. Optimum properties were achieved for Sr0.4Ca0.6La4Ti5O17 which exhibited, ?r ∼ 53.7, Qfo ∼ 11,532 GHz and τf ∼ −1.4 ppm/°C. |
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Keywords: | A. Ceramics D. Dielectric properties |
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