New insight on bismuth cuprates with incommensurate modulated structuresстатья

Статья опубликована в высокорейтинговом журнале

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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2016 г.

Работа с статьей


[1] New insight on bismuth cuprates with incommensurate modulated structures / A. V. Mironov, P. Vaclav, N. R. Khasanova, E. V. Antipov // Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials. — 2016. — Vol. 72. — P. 395–403. The incommensurate modulated crystal structure of Bi2.27Sr1.73CuO(6+delta) (2201) phase [a = 5.3874 (5), b = 5.3869 (4), c = 24.579 (3) A ˚ ; beta = 90.01 (1), q = 0.2105 (3)a* + 0.538 (4)c*, Z = 4, the (3 + 1)-dimensional monoclinic A2/a(alpha,0,gamma) group] has been refined with R = 0.041, wR = 0.052 from X-ray single-crystal data including up to third-order satellite reflections. The same structure has also been considered as incommensurate composite with a2 = 2.437, b2 = 5.387, c2 = 24.614, beta2 = 93.06, q2 = 0.4524a2*+0.243c2* and the (3 + 1)-dimensional A2/m(alpha,0,gamma)0s group for the second component. Both approaches give quite similar results. The structure possesses oxygen disorder in the oxygen-rich region of the BiO layer. An extra O atom is determined in the bridging position shifted about 0.6 A ˚ from BiO towards the SrO layer. Its presence is the cause of the tremendous increase of the bismuth U11 atomic displacement parameter in  20% of the unit cells (t = -0.05 – +0.15). Vacancies are determined in the oxygen site of the SrO layer, which may result in the oxygen content variation with annealing at different oxygen pressures. The total refined oxygen content 6.18 (1) corresponds to the results of chemical analysis. [ DOI ]

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