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- W2014009628 abstract "Abstract High resolution transmission electron microscopy (HRTEM) and diffraction techniques were used to characterize Tl 2 Ba 2 CuO 6 specimens prepared using a variety of new synthetic paths. Thus the degree of crystalline perfection, at atomic resolution, of the tetragonal phase, which usually has a superconducting transition in the range 0–90K, could be characterized and compared with that of the orthorhombic phase. Excellent quality Tl 2 Ba 2 CuO 6 crystals, with Tc = 92K, were obtained under high pressure of argon to minimize Tl-loss. In the best quality material there were no extended defects. The application of computer-simulation and image-matching techniques allowed the CuO 2 layers of the structure to be located on the HRTEM images. High-Tc materials showed typically perfect order for the CuO 2 and adjacent Ba-O sheets : for non-superconducting orthorhombic crystals fluctuations of image intensity and contrast for the CuO 2 sheets were observed. It is suggested that such fluctuations, associated with variations of Tl occupancy, including vacancies and/or Cu substituting for Tl, are responsible for the variability of Tc exhibited by this cuprate material." @default.
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- W2014009628 date "1993-05-01" @default.
- W2014009628 modified "2023-09-25" @default.
- W2014009628 title "High-resolution transmission electron microscopic (HRTEM) studies of Tl2Ba2CuO6±x" @default.
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- W2014009628 doi "https://doi.org/10.1016/0925-8388(93)90702-o" @default.
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