Structural phase transition study of Ba2YCu3O6+x in air

Journal of Materials Research volume 3, pages832–839(1988)Cite this article

Abstract

A structural phase transition study of Ba2YCu3O6+x (x = 0 to 1) has been conducted on a series of 13 quenched samples. These samples were prepared from an orthorhombic material by annealing at temperatures from 400 to 1000 °C in air, followed by rapid quenching. All quenchings were performed by using a liquid-nitrogen-cooled copper cold well with a continuous flow of cooled helium gas. Various measurements including x-ray diffraction, thermogravimetric analysis, Meissner effect, and scanning electron microscopy were carried out in order to correlate the nature of the phase transition with erystallographic data, superconductivity, and annealing temperature. The phase transition from Ba2YCu3,O7 to Ba2YCu3O6 appears to involve two orthorhombic regions: region A with a <b ≈ c/3 below approximately 600 °C and region B with cell parameters of a < b < c/3 from & 600 to 708–720 °C. The transformation from orthorhombic to tetragonal takes place in the temperature range of 708–720 °C. This transition appears to be a second-order, order-disorder type.

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Affiliations

  1. Institute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, 20899, Maryland, USA

    W. Wong-Ng, L. P. Cook, C. K. Chiang, L. J. Swartzendruber, L. H. Bennett, J. Blendell & D. Minor

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  1. W. Wong-Ng
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  2. L. P. Cook
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  3. C. K. Chiang
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  4. L. J. Swartzendruber
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  5. L. H. Bennett
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  6. J. Blendell
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  7. D. Minor
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Correspondence to W. Wong-Ng.

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Wong-Ng, W., Cook, L.P., Chiang, C.K. et al. Structural phase transition study of Ba2YCu3O6+x in air. Journal of Materials Research 3, 832–839 (1988). https://doi.org/10.1557/JMR.1988.0832

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