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Total scattering and pair distribution function analysis in modelling disorder in PZN (PbZn1/3Nb2/3O3)

机译:PZN(PbZn1 / 3Nb2 / 3O3)建模障碍中的总散射和对分布函数分析

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摘要

The ability of the pair distribution function (PDF) analysis of total scattering (TS) from a powder to determine the local ordering in ferroelectric PZN (PbZn1/3Nb2/3O3) has been explored by comparison with a model established using single-crystal diffuse scattering (SCDS). While X-ray PDF analysis is discussed, the focus is on neutron diffraction results because of the greater extent of the data and the sensitivity of the neutron to oxygen atoms, the behaviour of which is important in PZN. The PDF was shown to be sensitive to many effects not apparent in the average crystal structure, including variations in the B-site—O separation distances and the fact that 〈110〉 Pb2+ displacements are most likely. A qualitative comparison between SCDS and the PDF shows that some features apparent in SCDS were not apparent in the PDF. These tended to pertain to short-range correlations in the structure, rather than to interatomic separations. For example, in SCDS the short-range alternation of the B-site cations was quite apparent in diffuse scattering at (½ ½ ½), whereas it was not apparent in the PDF.
机译:通过与使用单晶扩散散射建立的模型进行比较,探索了粉末总散射(TS)的对分布函数(PDF)分析确定铁电PZN(PbZn1 / 3Nb2 / 3O3)的局部有序能力的能力。 (SCDS)。在讨论X射线PDF分析时,由于数据的范围更大以及中子对氧原子的敏感性(其行为在PZN中很重要),因此重点放在中子衍射结果上。结果表明,PDF对许多在平均晶体结构中不明显的效应敏感,包括B位-O分离距离的变化以及〈110〉Pb 2 + 位移的可能性最大。 。 SCDS和PDF之间的定性比较表明,SCDS中明显的某些功能在PDF中不明显。这些倾向于与结构中的短程相关性有关,而不是与原子间的分离有关。例如,在SCDS中,B位阳离子的短程交替在(1/2½½)处的漫散射中非常明显,而在PDF中则不明显。

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