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Effect of Doping on Defect Structure and Phase Stability in Y-Based Cuprates: In-Situ Tem Studies

  • K. Rajan
  • R. Garcia
  • L. C. Gupta
  • R. Vijayaraghavan

Abstract

Transmission electron microscopy (TEM) studies of defect structure in YBa2Cu3−xMxOy doped with Mg and Zn (M = Mg, Zn) are reported. The Mg doped material exhibited a large number of non-intersecting <110> twins. In-situ heat pulsing experiments in the TEM showed that only one of the twin variants was unstable to annealing. It was also found that other types of planar defects may replace the disappearance of one of the twin variants. The Zn doped material on the other hand showed remarkable microstructural stability to the in-situ heating experiments. It is suggested that these results may be interpreted in terms of preferential site occupancy of dopants at twin boundaries.

Keywords

Twin Boundary Vacant Site Heating Experiment Twin Plane Transmission Electron Microscopy Technique 
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References

  1. 1.
    J.M. Tarascon, L.H. Greene, B.G. Bagley, W.R. McKinnon, P. Barboux and G.W. Hull, “Chemical Doping and Physical Properties of the New High Temperature Superconducting Pervoskites”, in: Poc. Intl. Workshop on Novel Mechanisms of Superconductivity, Berkeley, CA (June 1987) in press.Google Scholar
  2. 2.
    J.D. Jorgensen, D.G. Hinks, H. Shaked, B. Dabrowski, B.W. Veal, A.P. Paulikas, L.J. Nowioki, G.W. Crabtree, W.K. Kwok, A. Umezawa, L.H. Nunez, B.D. Dunlap, C.V. Segre and C.W. Kimball, “Structural and Superconducting Properties of Oxygen-Deficient and Doped YBa2Cu3O7-x, Physica B, 156, 157:877 ( 1989.ADSCrossRefGoogle Scholar
  3. 3.
    J.M. Tarascon, P. Barboux, L.H. Greene, G.W. Hull and B.G. Bagley, “3d-Metal Doping of the High Tc Pervoskite YBa2Cu3O7-x, in; MRS Proc., 99:523 (1988).ADSCrossRefGoogle Scholar
  4. 4.
    G. Van Tendeloo, J. VanLanduyt and S. Amelinckx, “Electron Microscopy of Static and Dynamic Phenomena”, in: Competing Interactions and Microstructures, Statics and Dynamics, R. LeSar, A. Bishop and R. Heffner, eds., Springer-Verlag, Berlin (1988).Google Scholar
  5. 5.
    K. Sasaki, K. Kuroda and H. Saka, “HREM In-situ Observation of a Transformation Interface Between Tetragonal and Orthorhombic Phases in YBa2Cu3O7-x”, Phil. Mag. Letters, 59:141 (1989).ADSCrossRefGoogle Scholar
  6. 6.
    S. Iijima, T. Ichihashi, Y. Kubo and J. Tabuchi, “Twinning of High-Ta Ba2YCu3O7-x Oxides”, Jap. J. Appl. Phys., 26:L1478 (1987).ADSCrossRefGoogle Scholar
  7. 7.
    M. Sugiyama, R. Suyama, T. Inuzuka and H. Kubo, “Phase Transformations in the Superconductor Ba-Y-Cu-O and La-Sr-Cu-O Compounds”, Jap. J. Appl. Phys., 26:L1202 (1987).ADSCrossRefGoogle Scholar
  8. 8.
    C.J. Jou and J. Washburn, “Formation of Coherent Twins in YBa2Cu3O7-x Superconductors”, J. Mater. Res, 4:795 (1989).ADSCrossRefGoogle Scholar
  9. 9.
    E. Ruedl, P. Delavignette and S. Amelinckx, “Electron Diffraction and Electron Microscopic Study of Long and Short Range Order in Ni4 Mo and the Substructure Resulting from Ordering”, Phys. Stat. Sol, 28:305 (1988).ADSGoogle Scholar
  10. 10.
    A.M. Ponte Goncalves, C.-S. Jee, D. Nichols, J.E. Crow, G.H. Myer, R.E. Solomon and P. Schlottman, “EPR Spectroscopy on Zn-Substituted YBa2Cu3O7”, in: MRS Proc., 99:583 (1988).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • K. Rajan
    • 1
  • R. Garcia
    • 1
  • L. C. Gupta
    • 2
  • R. Vijayaraghavan
    • 2
  1. 1.Rensselaer Polytechnic InstituteTroyUSA
  2. 2.Tata Institute of Fundamental ResearchBombayIndia

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