Abstract
A series of Mg1−x Zn x TiO3, 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−x Zn x TiO3 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 σ a.c, the AC conductivity, was higher than for the MZT0–MZT0.2 samples. Above 10 MHz, the (Q × f) factors and log σ a.c of the two groups were similar.
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Acknowledgments
This work was partially funded by the Directorate General of Higher Education, Indonesian Ministry of Education and Culture under the Contract No. 07555.8/IT2.7/PN.01.00/2014. One of the authors (FUE) thanks Mrs. Heidi Lorenz, Mr. Wolfgang Güther and Mr. Jens Biberstein of BAM for helping in the preparation and characterisation of the ceramics in the middle frequency region, and Dr. Ralph Bäβler of BAM, who had acted as a liaison with the characterisation laboratory of BAM.
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Fig. S
XRD spectral fitting profiles of: a) MZT0.1 and b) MZT0.4 in Fig. 4 using the Rietveld-based Rietica program. +++ = the experimental spectrum, red line = the calculated spectrum, green line = the difference between the experimental and the calculated spectra, vertical blue bars underneath the spectra = positions of the Bragg peaks for the identified Mg1-xZnxTiO3 and (Mg1-δZnδ)2TiO4/(Zn1-δMgδ)2TiO4 phases. Figures-of-merit of the refinements are: RwpMZT0.1 = 15.17, RpMZT0.1 = 11.86, RexpMZT0.1 = 8.56 and GoFMZT0.1 = 3.1; RwpMZT0.4 = 17.82, RpMZT0.4 = 13.96, Rexp MZT0.4 = 8.65 and GoF MZT0.4 = 3.2 (EPS 367 kb)
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Ermawati, F.U., Pratapa, S., Suasmoro, S. et al. Preparation and structural study of Mg1−x Zn x TiO3 ceramics and their dielectric properties from 1 Hz to 7.7 GHz. J Mater Sci: Mater Electron 27, 6637–6645 (2016). https://doi.org/10.1007/s10854-016-4610-6
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DOI: https://doi.org/10.1007/s10854-016-4610-6