Upadhyayula V Varadaraju

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Upadhyayula V Varadaraju
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Upadhyayula V Varadaraju
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Varadaraju, Upadhyayula V.
Varadaraju, Upadhyayula
Varadaraju, U. V.
Varadaraju, Upadhyayula Venkata
Varadaraju, Upadhayayula V.
Varadaraju, U.
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1987 - 19886
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Now showing 1 - 6 of 6
  • Placeholder Image
    Publication
    Superconductivity Studies on the High Tc Phase in the Y–Ba–Cu–O System
    (01-01-1987)
    Rao, G. V.Subba
    ;
    Upadhyayula V Varadaraju 
    ;
    Thomas, K. A.
    ;
    Vijayashree, R.
    ;
    Raju, N. P.
    ;
    Srinivasan, R.
    ;
    De, U.
    ;
    Janaki, J.
    ;
    Radhakrishnan, T. S.
    Synthesis, characterization and superconducting behavior of the phases (i) Y2-xBaxCu2O5 (0\leqslantx\leqslant1.6) and (ii) YBa2Cu3CxO7Cy (0\leqslantx\leqslant2.0) are reported. The composition YBa2Cu4O7Cy shows a Tc (zero resistance) of 94K. © 1987 The Japan Society of Applied Physics.
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    Publication
    Lithium insertion into phases with NZP structure
    (01-12-1987)
    Upadhyayula V Varadaraju 
    ;
    Thomas, K. Antony
    ;
    Sivasankar, Bommasamudram
    ;
    Rao, G. V.Subba
    Insertion of Li into the vacant sites (channels) of certain NZP phases (ATi2P3O12, A = Li, Na, and NbTiP 3O12) using BunLi at room temperature has been established; the preparation and preliminary structural and i.r. data of the phases are described.
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    Publication
    Metal atom incorporation studies on the phases with NZP structure: â–¡NbTiP3O12
    (01-01-1987)
    Rao, G. V.Subba
    ;
    Upadhyayula V Varadaraju 
    ;
    Thomas, K. A.
    ;
    Sivasankar, B.
    A wide variety of electropositive elements of the periodic table can be inserted into the vacant sites in the host framework structure of hexagonal NbTiP3O12 (an analog of nasicon) to give rise to isostructural phases. Synthesis, characterization, and preliminary data on the structure, IR spectra, and electrical resistivity are presented. Possible areas for further exploration are delineated. © 1987 Academic Press, Inc. All rights reserved.
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    Publication
    Superconductivity behaviour in screen-printed YBa2Cu3O7 films
    (01-01-1988)
    Upadhyayula V Varadaraju 
    ;
    Rao, G. V.Subba
    ;
    Chandrasekaran, K. D.
    ;
    Baradarajan, A.
    We have fabricated films of the high Tc superconducting oxide YBa2Cu3O7 by screen printing on alumina, calcia-stabilized zirconia, yttria-stabilized zirconia, SrTiO3 and La2CuO4 substrates. Alumina was found to be a suitable substrate for screen printing. La2CuO4 and SrTiO3 substrates can be used with shorter annealing times. Superconducting transition temperatures in the vicinity of 85 K have been established in some of the films. © 1980.
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    Publication
    High t superconductors based on y-ba-cu-0 system c
    (01-11-1987)
    Rao, G. V.Subba
    ;
    Upadhyayula V Varadaraju 
    Preliminary studies on the high T super conductivity encountered in the yttrium or rare earth-barium-copper-oxygen system are reported. Zero resistance Tc of 95K has been realized. © 1987, Taylor & Francis Group, LLC. All rights reserved.
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    Publication
    Effect of chemical substitution on the high-Tc behavior of YBa2Cu3O7
    (01-01-1987)
    Upadhyayula V Varadaraju 
    ;
    Natarajan, S.
    ;
    Kumar, T. S.Sampath
    ;
    Paranthaman, M.
    ;
    Rao, G. V.Subba
    ;
    Raju, N. P.
    ;
    Srinivasan, R.
    The effect of chemical substitution on the high-Tc (91 K) superconducting oxide YBa2Cu3O7, with the distorted perovskite structure, has been studied. Subtle changes in Tc occur when Y is partly replaced by Dy, Ho, Er, Tm, Yb, Lu, Bi and In. The possibility of coexistence of magnetic order and superconductivity or reentrant behavior in these high-Tc compounds will be described and discussed. © 1987.