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• W2020476727 startingPage "368" @default.
• W2020476727 abstract "(Ca0.28Ba0.72)2.5−0.5xNaxNb5O15 ceramics (CBNN, x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were prepared by the conventional solid-state reaction method. Pure tungsten bronze structure could be obtained in all compositions according to X-ray diffraction (XRD) patterns. Raman spectroscopy results showed that introducing Na+ in A sites could induce stronger interaction between A-sites ions and NbO6 octahedron, and also lead to the more distortion degree of NbO6 octahedron at higher Na+ contents. It was found that accompanying with the structural evolution from ‘unfilled’ to ‘filled’ tungsten bronze type by modulating Na+ concentration, some unique dielectric and ferroelectric behavior emerged for CBNN ceramics, especially when x > 0.4. Natural ferroelectric–paraelectric phase transition at the Curie Temperature (Tc) was determined for all compositions, while only the samples with x > 0.4 showed slight dielectric anomaly around 125–200 K, which was attributed to the local structural fluctuation of stronger NbO6 octahedron distortion in the ab plane. In addition, the more intense dependence of ε on the frequency measured around Tc could be attributed to the ions disorder in mainly A2 sites caused by simultaneous occupation of Na+ and Ba2+ ions when x > 0.4. Normal ferroelectric hysteresis loops were observed in all compositions, and the related mechanisms for ferroelectric variations were discussed in detail. The better comprehensive dielectric and ferroelectric properties was obtained at x = 0.8 due to the bigger distortion degree of NbO6 octahedron polar unit and the highest densification." @default.
• W2020476727 created "2016-06-24" @default.
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• W2020476727 date "2015-05-01" @default.
• W2020476727 modified "2023-09-27" @default.
• W2020476727 title "Role of structural modulation in electrical properties of tungsten bronze (Ca0.28Ba0.72)2.5−0.5Na Nb5O15 ceramics" @default.
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• W2020476727 doi "https://doi.org/10.1016/j.jallcom.2015.01.247" @default.
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