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- W3036701386 abstract "Recently Reyes-Gasga et. al. have studied the superstructures phases produced by the ordering of vacancies (or oxygen) in the YBa 2 Cu 3 O x , supercondutor compound. In these papers they also discussed briefly a posible interpretation of the diffraction pattern based on a square unit cell with edges 2√2 a × 2√2 a, where a=0.38nm (fig. 1e), and suggested that this pattern might not be due to a pure vacancy ordered structure but should presumably be attributed to a deformation modulated superstructure of a highly oxygen deficient perovskite phase. This diffraction pattern was studied previously in detail and it has been attributed to a number of oxygen vacancy ordered orthorhombic structures with different oxygen content. In this report I shall inform about some experiments concerning with the formation conditions and temperature behavior of the phase that produces this pattern. Heating the YBa 2 Cu 3 O 7 , superconductor compound in situ in the TEM is possible to obtain not only diffuse streaks and superstructure spots unless also new arrays of superstructure spots. Therefore the experimental procedure consists in the in situ heating of this compound in the JEDL 200C TEM using a heating holder. It is well known that the exact temperature value in this kind of experiments is hard to specify and here only an average temperature range is reported." @default.
- W3036701386 created "2020-06-25" @default.
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- W3036701386 date "1990-08-01" @default.
- W3036701386 modified "2023-10-18" @default.
- W3036701386 title "On the 2√2 a × 2√2 a supestructure phase" @default.
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- W3036701386 doi "https://doi.org/10.1017/s0424820100173686" @default.
- W3036701386 hasPublicationYear "1990" @default.
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