The microstructure and phase transformations of copper atom doped ceramic BiNbO4 synthesized at 950 and 1100°C were studied. According to XPA the samples in compact, pressed form crystallize in the α-BiNbO4 structure irrespective of the synthesis temperature and in spite of the phase transformation α → β at 1040°C. The substances BiNb1–xO4–δ∙xCuO (x ≤ 0.04) are graphite-colored composites with visually expressed grain microstructure. Thermograms of the samples show near 900°C an endo effect associated with the decomposition of the copper (II) oxide and thermal effects due to reconstructive phase transformations of the type α → γ → β in BiNbO4. It was determined that copper oxide impurity in bismuth orthoniobate ceramic acts as a heat sink, which increases the temperature of the phase transition α → γ on heating of compact samples.
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Translated from Steklo i Keramika, No. 5, pp. 14 – 19, May, 2020.
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Zhuk, N.A., Busargina, Y.A., Belyi, V.A. et al. Effect of Copper (II) Oxide on the Microstructure and Phase Transformations of Bismuth Orthoniobate. Glass Ceram 77, 173–177 (2020). https://doi.org/10.1007/s10717-020-00264-x
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DOI: https://doi.org/10.1007/s10717-020-00264-x