Frida U. Ermawati, Suminar Pratapa, S. Suasmoro, Thomas Hübert, Ulrich Banach
A series of Mg1−xZnxTiO3, x = 0–0.5 (MZT0–MZT0.5) ceramics was synthesised and characterised. The dielectric properties of the samples in the frequency range of 1 Hz–7.7 GHz were explored using three different methods: a contacting electrode method, a parallel-plate method and a perturbed resonator method. The electrical properties in the space charge and dipolar polarisation frequency ranges are discussed in relation to the phase composition and microstructure data. Differences in the zinc substitution divided the dielectrics into two groups, namely MZT0–MZT0.2 and MZT0.3–MZT0.5, each with different amount of a main Mg1−xZnxTiO3 solid solution phase and a secondary solid solution phase. Zinc substitution promoted the density of the ceramics, improved the purity of the main phase and increased the permittivity for frequencies up to 108 Hz, but reduced the permittivity in the microwave range. In the MZT0.3–MZT0.5 samples, for frequencies less than 1 MHz the quality (Q × f) factors were lower and log σa.c, the AC conductivity, was higher than for the MZT0–MZT0.2 samples. Above 10 MHz, the (Q × f) factors and log σa.c of the two groups were similar. © 2016, Springer Science+Business Media New York.
Physics Department, Faculty of Mathematics and Sciences, Institut Teknologi Sepuluh Nopember (ITS), Surabaya, 60111, Indonesia; Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya (UNESA), Surabaya, 60231, Indonesia; Bundesanstalt für Materialforschung und –prüfung (BAM), Unter den Eichen 44-46, Berlin, 12203, Germany
