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  • TITLE
  • DECLARATION
  • CERTIFICATE
  • DEDICATION
  • ACKNOWLEDGEMENT
  • PREFACE
  • LIST OF PUBLICATlONS
  • PATENTS
  • CONTENTS
  • 1. GENERAL INTRODUCTION
  • 1. GENERAL INTRODUCTION
  • 1.2 Perovskites
  • 1.3 High temperature superconductors:
  • 1.3.1 Superconductivity
  • 1.3.2 Evolution of high temperature superconductivity
  • 1.3.4 The Yttrium Barium Copper Oxide superconductor
  • 1.3.4 Bismuth Strontium Calcium Copper Oxide Superconductor
  • 1.3.5 Thallium Barium Calcium Copper Oxide Superconductors
  • 1.3.6 Mercury Barium Calcium Copper Oxide Superconductor
  • 1.4. High Temperature Superconducting Fiims
  • 1.4.1 Superconducting Thick Films
  • 1.4.2 Substrates for high Tc superconducting films
  • 1.5. Nanostructured Materials
  • 1.6 Scope of the present work
  • References
  • 2. PREPARATION AND CHARACTERIZATION TECHNIQUES
  • 2.1 .Introduction
  • 2.2 Ceramic Processing
  • 2.1.Introduction
  • 2.2.1 Powder Preparation
  • 2.2.2 Shaping
  • 2.2.3 Sintering
  • 2.3 Preparation of High Tc Superconducting thick films
  • 2.4 Characterization techniques
  • 2.4.1. Powder X-ray Diffraction Technique
  • Fig.2.1: Reflection of a plane wave by a set of parallel planes.
  • 2.4.2 Differential Thermal Analysis (DTA):
  • 2.4.3 Thermogravimetric AnaIysis (TGA)
  • 2.4.4. IR spectroscopy
  • 2.4.5 Gas Adsorption Technique
  • 2.4.6 Agglomerate size Analysis
  • 2.4.7 Transmission Electron Microscopy
  • 2.4.8. Dielectric measurements
  • 2.4.9. Resistance measurements
  • 2.4.10 Current density measurements
  • References
  • 3. SYNTHESIS OF Ba2RE ZrO5.5 (R E = La, Ce, Eu, Yb, Ho, and Er): A NEW GROUP OF COMPLEX PEROVSKITE CERAMIC OXIDE THROUGH SOLID STATE REACTION METHOD
  • 3.1 Introduction
  • 3.2 Synthesis of Ba2REZrO5.5 (RE =La, Ce, Eu, and Yb)
  • 3.3 Sintering of Ba2REZrO5.5 ceramics
  • 3.4 Structural characterization of Ba2REZrO5.5 ceramics
  • Fig.3.5: The Crystal structure diagram of Ba2REZrO 5.5
  • Fig.3.5: The Crystal structure diagram of Ba2REZrO5.5
  • 3.5 Synthesis of Ba2REZrO5.5 (RE = Ho and Er):
  • 3.6 Sintering and structural studies of Ba2REZrO5.5 (RE=Ho and Er)
  • 3.6 DTA Studies of Ba2REZrO5.5 (RE = La, Ce, Eu, Yb, Ho and Er)
  • 3.7 Melting studies of Ba2REZrO5.5 (RE=L a, Ce, Eu, Yb, Ho and Er)
  • 3.8 Stability studies of Ba2REZrO5.5 (R E = La, Ce, Eu, Yb, Ho and Er)
  • 3.9 Dielectric studies of Ba2REZrO5.5 (RE = La, Ce, Eu, Yb, Ho and Er)
  • 3.10 Conclusions
  • Reference
  • 4. BARIUM RARE-EARTH ZIRCONATES AS NOVEL SUBSTRATE FOR SUPERCONDUCTING YBa2Cu3O7.5 FILMS
  • 4.1 Introduction
  • 4.2 Chemical reactivity between YBCO and Ba2REZrO5.5
  • 4.3 The Lattice matching of BazREZrO5.5 with YBCO
  • 4.4 Preparation of YBCO thick films on Ba2REZrO5.5
  • 4.5 Characterization of the YBCO thick films
  • 4.6 Conclusions
  • References
  • 5. DEVELOPMENT OF SUPERCONDUCTING Bi-CUPRATES THICKFILMS ON BARIUM RARE-EARTH ZIRCONATES BY DIPCOATING AND MELT TEXTURING
  • 5.1 Introduction
  • 5.2 Synthesis of Bi (2212) superconductor
  • 5.3 Chemical reactivity between Ba2REZrO5.5 and Bi (2212)
  • 5.4 Development of Bi (2212) thick films on Ba2REZrO5.5
  • 5.5 Synthesis of Bi (2223) superconductor
  • 5.6 Chemical reactivity between Ba2REZrOss and Bi (2223)
  • 5.7 Development of Bi (2223) thick films on Ba2REZro5.5
  • 5.8 Conclusions
  • References
  • 6. SYNTHESIS AND CHARACTERIZATION OF NANOPARTICLES OFBARIUM RARE-EARTH ZIRCAONATES THROUGH A NOVEL COMBUSTION ROUTE
  • 6.1 Introduction
  • 6.2 Wet Chemical methods
  • 6.3 The modified combustion process
  • 6.3 Synthesis of Nanoparticles of Ba2REZrOSS
  • 6.4 Characterization of Ba2REZrO5.5 powders
  • Fig. 6.1 5: (a) Bright field TEM micrograph of an as-prepared Ba2LaZrO5.5 (, b) corresponding selected area diffraction pattern, and (c) dark-fieldimage of a particle of as-synthesized Ba2LaZrOs.5 powder
  • Fig. 6.16: (a) Bright field TEM micrograph of an as-prepared Ba2EuZrO5.5 (, b) corresponding selected area diffraction pattern, and (c) bright field micrograph of an as-prepared Ba2EuZrO5.5 powder containing larger particles
  • Fig. 6. 17: HRTEM lattice image of a powder showing aggregation og finer crystallitesin the particle having related orientation
  • Fig. 6.18: (a) Bright field and (b) dark field TEM micrographs of a as-prepared Ba2HoZrO5.5 powder particle, (c) corresponding electron diffraction pattern.
  • Fig.6.19: (a) Bright field TEM micrographs of a powder particle of the aspreparedprepared Ba2YZrO5, 5 (, b) corresponding electron diffraction patternand (c) dark field image of a powder particle of the as-synthesized Ba2YZrO 5.5.
  • Fig.6.20: HRTEM lattice image of an intercrystalline boundary of Ba2YZrO5.5.
  • 6.5 Sintering of nanoparticIes of Ba2REZrO5.5:
  • 6.6 Structural characterization of the sintered Nanoparticles
  • 6.7 Conclusions
  • References
  • 7. SUMMARY AND CONCLUSION
  • 7.1 Future Projections