Origin of diffuse scattering appearing in iron-doped Ti-Ni shape memory alloys

Yamamoto, Takuya; Choi, Myung Suk; Majima, Sho; Fukuda, Takashi; Kakeshita, Tomoyuki

doi:10.1140/epjst/e2008-00645-7

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…There are numerous examples in fields ranging from alloys (Schweika, 1998), shape-memory alloys (Yamamoto et al, 2008), ferroelectrics (Pasciak et al, 2012), fast ion conductors (Welberry & Pasciak, 2011;Keen, 2002) and semiconductors (Barchuk et al, 2010) to high-T c superconductors (Izquierdo et al, 2006;Izquierdo et al, 2011) and even pharmaceuticals (Chan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Interpretation of diffuse scattering in the high-T_csuperconductor HgBa₂CuO_4+δ

Welberry¹,

Goossens²

2016

IUCrJ

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Published diffuse X-ray scattering from the high-T c superconductor HgBa 2 CuO 4+ has been reexamined with a view to developing a model that more satisfactorily accounts for the observed patterns. The present work agrees with the previous conclusion that the doping oxygen atoms form long and isolated interstitial chains that run in both tetragonal directions. However, a distinctly different model is proposed for the accompanying displacement patterns of the atoms surrounding these linear defects. In this new model it is proposed that it is the correlated shifts of the Ba atoms along the length of the defect chains that are the primary source of the observed scattering, and that the variations of intensity in the generated diffuse streaks of scattering originate from lateral shifts of both Hg and Ba atoms away from defects. The new model yields diffraction patterns that are in much more convincing agreement with the observations than the original model.

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