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  • TITLE
  • CERTIFICATE
  • DECLARATION
  • ACKNOWLEDGEMENT
  • CONTENTS
  • PREFACE
  • 1. A BRIEF REVIEW ON THE HIGH-Tc SUPER CONDUCTING COMPOUNDS AND AN INTRODUCTION TO THE THEORY OF ELASTICITY AND THERMAL EXPANSION
  • 1.1 Introduction
  • 1.2 La2-x, SrxCuO4
  • 1.3 Nd 1.85Ce0.15CuO4
  • 1.4 Bi2Sr2CaCu2O8
  • 1.5 Theory of Elasticity
  • 1.6 Finite Strain Theory of Elasticity
  • 1.7 Quasi-harmonic Theory of Thermal Expansion
  • References
  • 2. INTERLATTICE DISPLACEMNETS OF La1.8Sr0.2CuO4, Nd1.85Ce0.15CuO4and BI2Sr2CaCu2O3
  • 2.1 Introduction
  • Fig. 2.1. Body-antered tetragonal structure of La, 8Sro, 2Cu0, andthe arrangement of the 14 atoms in the unit cell
  • 2.2 Theory
  • 2.3 Interlattice Displacements of La 1.8Sr0.2CuO4
  • 2.4 Interlattice Displacemnts of Nd1.85Ce0.15CuO4
  • 2.5 Interlattice Displacements of Bi2Sr2CaCu2O8
  • 2.6 Results and Discussion
  • References
  • 3. SECOND-ORDER ELASTIC CONSTANTS OF La1.8Sr0.2CuO4, Nd1.85Ce0.15CuO4 and BI2Sr2CaCu2O8
  • 3. 1 Introduction
  • 3.2 General Theory
  • 3.3 Second-order Elastic Constants of La 1.8Sr0.2CuO4
  • 3.4 Second-order Elastic Constants of Nd1.85Ce0.15CuO4
  • 3.5 Second-order Elastic Constants of Bi2Sr2CaCu2O8
  • 3.6 Results and Discussion
  • References
  • 4. THIRD-ORDER ELASTIC CONSTANTS OF La1.8Sr0.2CuO4, Nd1.85Ce0.15CuO4and BI2Sr2CaCu2O3
  • 4.1 Introduction
  • 4.2 Theory
  • 4.3 Third-order Elastic Constants of La1.8Sr0.2CuO4
  • 4.4 Third-order Elastic Constants of Nd1.85Ce0.15CuO4
  • 4.5 Third-order Elastic Constants of Bi2Sr2CaCu2O8
  • 4.6 Results and Discussion
  • References
  • 5. PRESSURE DERIVATIVES OF THE SECOND-ORDER ELASTIC CONSTANTS OF La1.8Sr0.2CuO4, Nd1.85Ce0.15CuO4 and BI2Sr2CaCu2O3
  • 5.1 Introduction
  • 5.2 Theory
  • 5.3 La1.8Sr0.2CuO4
  • 5.4 Nd l.85Ce0.15CuO4
  • 5.5 Bi2Sr2CaCu2O8
  • 5.6 Results and Discussion
  • References
  • 6. LOW TEMPERATURE THERMAL EXPANSION OF La1.8Sr0.2CuO4, Nd1.85Ce0.15CuO4 and BI2Sr2CaCu2O8
  • 6.1 Introduction
  • 6.2 Procedure to Obtain the Low Temperature Limit of Gruneisen Function (γL)
  • 6.3 La 1.8Sr0.2CuO4
  • 6.4 Nd 1.85Ce0.15CuO4
  • 6.5 Bi2Sr2CaCu2O8
  • 6.6 Discussion of Results
  • References
  • 7. SUMMARY AND CONCLUSION
  • APPENDIX
  • POSITION CO-ORDINATES OF THE NINE NEAREST NEIGHBOURS OF THE DIFFERENT ATOMS IN THE UNIT CELL OF La1.8Sr0.2CuO4