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Sol–gel synthesis of Na_0.4K_0.6Ca₄Nb₅O₁₇ microwave ceramics

Raz Muhammad

Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar 25120, Pakistan

Corresponding author.

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Yaseen Iqbal

Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar 25120, Pakistan

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, and

Carlos Renato Rambo

Laboratory of Electrical Materials, Department of Electrical Engineering, Federal University of Santa Catarina, Florianopolis, Brazil

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https://doi.org/10.1142/S0217979215501532Cited by:0 (Source: Crossref)

Abstract

The sol–gel method was developed to synthesize A₅B₅O₁₇-type Na_0.4K_0.6Ca₄Nb₅O₁₇ layered perovskite ceramics, using NaNO₃, KNO₃, CaNO₃⋅4H₂O and NbCl₅ precursors. Samples were calcined at 950°C and sintered at 1200–1350°C. The phase and microstructural analyses of samples were carried out using X-ray diffractometer (XRD) and scanning electron microscope. X-ray diffraction analysis revealed single phase monoclinic symmetry, within the detection limit of in-house XRD facility. Microstructural analysis shows ~ 10 μm elongated rod-like grains. The microwave dielectric properties of the sintered composition at 1300°C were: relative permittivity (ε_r) = 42, quality factor (Q × f₀) = 8270 GHz and temperature coefficient of resonant frequency (τ_f) = -10.1 ppm/°C.

Keywords:

PACS: 77.22.Ch, 77.22.Ej, 77.22.Gm

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