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- W3018720021 abstract "Thephaseformation and functional properties (dielectric, ferroelectric switching, and tunability) in xBaGeO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> -(1 - x)BaTiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> ceramics with compositions x = 0, 0.01, 0.018, 0.1, 0.68, and 1, produced by solid-state reaction, are presented. For small Ge additions x ≤ 0.10 for which the perovskite tetragonal phase is predominant, the low-field dielectric properties are quite similar to ones of BaTiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> ceramics, with all the structural phase transitions in the same temperature range and a small shift of the Curie temperature to higher values when increasing Ge addition. The eutectic composition x = 0.68 is a composite containing mostly nominal amounts of hexagonal α-BaGeO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> phase and tetragonal BaTiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> , and shows permittivity below 100 and a lossy linear dielectric character, with zero tunability and lack of switching, similar as the BaGeO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> composition (x = 1). The role of Ge in increasing the density by liquid-phase sintering is beneficial for improving the electrical properties. In this sense, the composition x = 0.10 is optimum in the present ceramic series: it shows the highest relative density of 99% and large grains (tens of micrometers), excellent switching properties with the highest polarization and a rectangular switching loop, the highest permittivity above room temperature and a good ε(E) tunability of 60%-70%, comparable with the best values reported in other BaTiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> solid solutions." @default.
- W3018720021 created "2020-05-01" @default.
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- W3018720021 date "2021-02-01" @default.
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- W3018720021 title "Preparation and Functional Properties of BaTiO<sub>3</sub>–BaGeO<sub>3</sub> Ceramics" @default.
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- W3018720021 doi "https://doi.org/10.1109/tuffc.2020.2990755" @default.
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