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The Crystal Structures of the Cubic and Tetragonal Phases of Y1Ba3Cu2O6.5 + δ and Y1Ba4Cu2O7.5 + δ

  • M. A. Rodriguez (a1), J. J. Simmins (a1), P. H. McCluskey (a1), R. S. Zhou (a1) and R. L. Snyder (a1)...


The discovery of the superconducting material Y1Ba2Cu3O6+δ ( “123” material) resulted in a world wide interest in the pseudo-ternary system BaO·YO·CuO. A complete study of the phases present in this system was initiated to develop a better understanding and processing of the superconducting 123 material. The crystal structures were established for two of the three ternary compounds in this system immediately after the discovery of superconductivity. One such phase was a green insulating compound Y2Ba1Cu1O5 (”211”) which has the space group. The superconducting 123 compound was found to have the space group Pmmm and an ordered triple-celled perovskite structure.



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[1] Chu, C.W., Hor, P.H., Meng, R.L., Gao, L., Huang, Z.J., Wang, Y.Q., Wu, M.K., Ashburn, J.R. and Torng, C.Y., “Superconductivity at 93K in a New Mixed Phase Y-Ba-Cu-0 Compound System at Ambient Pressure”, Phys. Rev. Lett., 58, 908-910, March 1987.
[2] Frase, K.C., Liniger, E.G., Clarke, D.R., “Phase Compatibilities in the System Y2O3-BaO-CuO at 950C”, J. Am. Ceram. Soc. , 70 [9| C204-C205 (1987).
[3] Robinson, A.L., “An Oxygen Key to the New Superconductors”, Science, 236 10631065 (1987).
[4] Michel, C. and Raveau, B., “Les Oxydes A2BaCuO5 (A = Y,Sm,Gd,Dy,Ho,Er,Yb)”, J. Sol. St. Chem. 43 7380 (1982).
[5] Gallagher, W.J., Sandstrom, R.L., Dinger, T.R., Shaw, T.M. and Chance, D.A., “Identification and Preparation Of Single Phase 90K Oxide Superconductor and Structural Determination by Lattice Imaging”, Sol. St. Comm. , 63 [2], 147-150, July 1987.
[6] Beno, M.A., Soderholm, L., Capone, D.W., II, Hinks, D.G., Jorgensen, J.D., Grace, J.D., Schuller, Ivan K., Segre, C.U. and Zhang, K., “Structure Of The Single-Phase High-Temperature Superconductor YBa2Cu3O7-δAppl. Phys. Lett. , 51 (1), 57-59 6 July 1987.
[7] Roth, R.S., Davis, K.L. and Dennis, J.R., “Phase Equilibria and Crystal Chemistry in the System Ba-Y-Cu-O”, Adv. Ceram. Mats, 2 , 303-312 (1987).
[8] Snyder, R.L.,“A Program to Apply Internal Standard Corrections”, New York State College of Ceramics (1984).
[9] Howard, S.A. and Snyder, R.L., “Shadow - A Program for X-ray Powder Diffraction Profile Analysis”, New York State College of Ceramics Report, 62 pages (1984).
[10] Wiles, D.B., Young, R.A., “A New Computer Program for Rietveld Analysis of X-Ray Powder Diffraction Patterns”, J. Appl. Cryst. 14 149151 (1981).
[11] Johnson, C.K., “ORTEP” , ORNL-37S4, Oak Ridge National Laboratory (1965).
[12] Louer, D. and Louer, M., “Methods d'Essais et Erreurs pour l'Indexation Automatique des Diagrammes des Poudre”, J. Appl. Cryst. 5 271275 (1972).
[13] Louer, D., and Vargas, R., “Indexation Automatique des Diagrammes de Poudre par Dichotomies Succesives”, J. Appl. Cryst. 15 542545 (1982).
[14] Visser, J.W., “A Fully Automatic Program for Finding the Unit Cell from Powder Data”, J. Appl. Cryst, 2, 8995 (1969).
[15] Taupin, D., “A Powder-Diagram Automatic-Indexing Routine” , J. Appl. Cryst, 6, 380385 (1973).
[16] Goebel, J.B. and Wilson, A.S., “Index, A Computer Program for Indexing X-ray Diffraction Powder Patterns”, Atomic, U.S. Energy Commission R&D Report (Batelle-Northwest Report BNWL-22), (1965).
[17] Stalick, J.K. and Mighell, A.D., “Crystal Data” , NBS Technical Note 1229 (1986).
[18] International Centre for Diffraction Data - JCPDS distributors, 1601 Park Lane, Swarthmore, PA 19081.
[19] Himes, V.L. and Mighell, A.D., “NBS*Lattice: A Program to Analyze Lattice Relationships”, NBS Technical Note 1214 (1985).
[20] Harlow, R. and Johnson, G.G. Jr. , Programs distributed by the JCPDS[18].
[21] Hahn, T., “International Tables for Crystallography”, Vol A. , Reidel, D. Publishing Co. Dordrecht, Holland (1983).
[22] Smith, G.S. and Snyder, R.L., “FN: A Criterion for Rating Powder Diffraction Patterns and Evaluating the Reliability of Powder Pattern Indexing”, J. Appl. Cryst. 12 6065 (1979).
[23] Howard, S.A. and Snyder, R. L., “Estimation of Particle Size and Strain using Direct Convolution Products in Profile and Pattern Fitting Algorithms”, J. Appl. Cryst. in press (1988).
[24] Snyder, R.L., “Micro-Index A Package of Powder Pattern Indexing Programs” , MDI Inc. PO Box 791, Livermore CA 94550.


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