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arXiv 0802.0790cond-mat.mtrl-sci
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质子传导钙钛矿BaIn_{x} Zr_{1-x} O_{3-x/2}(x = 0-0.75)的短程结构

Short-range structure of proton conducting perovskite BaIn_{x}Zr_{1-x}O_{3-x/2} (x = 0-0.75)

M. Karlsson, A. Matic, C. S. Knee, I. Ahmed, S. Eriksson, L. Börjesson

摘要:

在一个系统的研究中,我们研究了掺杂剂水平和水合作用对质子导电钙钛矿型氧化物BaIn_{x} Zr_{1-x} O_{3-x/2}(x = 0-0.75)的短程结构的影响,使用红外和拉曼光谱。结果表明,掺杂导致这些材料的平均立方结构的显着的局部扭曲。通过增加的In浓度从x = 0到x = 0.75的新带出现,并在IR和拉曼光谱中的强度增长,表明局部失真变得越来越明显。结构畸变在很大程度上与氧空位的存在无关,而是主要由In^{3+}和Zr^{4+}离子之间的尺寸差异驱动,这导致阳离子的位移和(In/Zr)O_{6}八面体的倾斜。基于我们的研究结果,我们认为在x = 0.10和x = 0.25之间存在一个阈值,在该阈值处,局部结构畸变在整个钙钛矿结构中传播。我们的光谱数据与质子电导率报告相同的材料的比较表明,扩展的结构扭曲的存在下,有利于快速质子传输。

英文摘要:

In a systematic study we investigate the effect of dopant level and hydration on the short-range structure of the proton conducting perovskite-type oxide BaIn_{x}Zr_{1-x}O_{3-x/2} (x = 0-0.75), using infrared and Raman spectroscopy. The results show that doping leads to significant local distortions of the average cubic structure of these materials. By increasing the In concentration from x = 0 to x = 0.75 new bands appear and grow in intensity in both the IR and Raman spectra, showing that the local distortions become successively more and more pronounced. The structural distortions are largely uncorrelated to the presence of oxygen vacancies, but instead are mainly driven by the size difference between the In^{3+} and Zr^{4+} ions, which leads to displacements of the cations and to tilting of the (In/Zr)O_{6} octahedra. Based on our results, we suggest that there is a threshold between x = 0.10 and x = 0.25 where the local structural distortions propagate throughout the whole perovskite structure. Comparison of our spectroscopic data with the proton conductivity reported for the same materials indicates that the presence of extended structural distortions are favorable for fast proton transport.

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