Low loss Sr1− xCaxLa4Ti5O17 microwave dielectric ceramics
Microwave dielectric ceramics in the Sr 1− x Ca x La 4 Ti 5 O 17 (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 Ca 2+ for Sr 2+ which was associated with a decrease in the dielectric
constant (ɛ r) and temperature coefficient of resonant frequency (τ f) but an increase in …
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 Ca 2+ for Sr 2+ which was associated with a decrease in the dielectric
constant (ɛ r) and temperature coefficient of resonant frequency (τ f) but an increase in …
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 (ɛr) and temperature coefficient of resonant frequency (τf) but an increase in quality factor, Qfo. Optimum properties were achieved for Sr0.4Ca0.6La4Ti5O17 which exhibited, ɛr ∼ 53.7, Qfo ∼ 11,532 GHz and τf ∼ −1.4 ppm/°C.
Elsevier
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