Alexandra C. Austin , Amy J. Knorpp , Jon G. Bell , Huw Shiel , Luca Artiglia , Katharina Marquardt , Michael Stuer
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引用次数: 0
Abstract
A barium-based perovskite structured ceramic with five different B-site cations was prepared by a solid-state synthesis method. The phase and chemical homogeneity of the synthesised material was verified using x-ray diffraction and energy dispersive x-ray spectroscopy, showing the successful synthesis of a single-phase perovskite structure with Ba A-site and Ti, Hf, Zr, Y, Nb, B-site cations. Ultra-high vacuum x-ray photoelectron spectroscopy was used to reveal the valence states of the constituent elements. Conventional, two-step and spark plasma sintering were used to form dense pellets with limited grain growth. The room temperature electrical characteristics of the sintered pellets were investigated by electrochemical impedance spectroscopy where a conductivity increase of two orders of magnitude was observed in a water-bearing atmosphere. Synchrotron-based ambient-pressure x-ray photoelectron spectroscopy performed under water-bearing and dry conditions suggest that the conductivity increase is related to the incorporation of hydroxyl groups into the perovskite structure.
通过固态合成法制备了含有五种不同 B 位阳离子的钡基包晶结构陶瓷。利用 X 射线衍射和能量色散 X 射线光谱验证了合成材料的相位和化学均匀性，结果表明成功合成了具有 Ba A 位和 Ti、Hf、Zr、Y、Nb、B 位阳离子的单相透辉石结构。利用超高真空 X 射线光电子能谱揭示了组成元素的价态。采用传统烧结、两步烧结和火花等离子烧结法形成了晶粒生长有限的致密颗粒。烧结颗粒的室温电特性通过电化学阻抗光谱进行了研究，在含水环境中，电导率提高了两个数量级。在含水和干燥条件下进行的同步辐射环境压力 X 射线光电子能谱分析表明，电导率的提高与羟基加入到包晶结构中有关。
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