Abstract
The structural instability, relaxor ferroelectricity and microwave dielectric (MWD) properties of Sr(1-x)CexTi(1-2/3y)MgyO3 (sintered in 5%H2 and 95%N2 atmosphere) samples were systematically studied. The ceramic sample with x = 0.05 shows cubic symmetry by x-ray diffraction (XRD). However, for x ≥ 0.1 the existence of superlattice and peaks splitting, clarify the existence of tetragonal symmetry. For x = 0.1, the SEM-EDX maps indicates the formation of a complete solid solution with a dense microstructure. For all samples, the presence of a frequency-dependent dielectric maxima (ε′−T plot) and intrinsic ferroelectricity (PUND) clarifies the relaxor ferroelectric nature. More interestingly, the sample with x = 0.15 shows a low microwave dielectric permittivity (εr) of 19, temperature coefficient of resonance frequency (TCF, τf) of +87 ppm/°C, and the Q × f value of 302 GHz, respectively.
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