• HOME
  • Search & Results
  • Full Text
  • Thesis Details
 
Page: 283
 
 Full Screen

  • TITLE
  • DEDICATION
  • DECLARATION
  • CERTIFICATE
  • ACKNOWLEDGEMENT
  • CONTENTS
  • PREFACE
  • 1. GENERAL INTRODUCTION
  • 1.1 Introduction
  • 1.2 Definitions of Glass
  • 1.3 Differences Between Crystalline and Amorphous Solids
  • Fig.l Schematic representation of (a) ordered crystalline form and (b) random network amorphous form of the same composition.
  • 1.4 Formation of Glasses
  • 1.4.1Thermodynamics of glass formation
  • Fig.l.2. Volume-temperature characteristics for crystal, liquid and glass.
  • 1.4.2 Glass or network formers and network modifiers
  • Fig.1.3. Two-dimensional network of sodium-silicate glass.
  • 1.5 Kinetics of Glass Formation
  • Fig.1.4 Dependence of rate of crystallizationu of an undercooled liquid on temperature.
  • 1.6 Preparation of Amorphous Materials (Glasses)
  • (i) Thermal evaporation
  • (ii) Melt-quenching technique
  • Fig.1.5. Schematic diagram of melt-spinning technique.
  • Fig.1.6. schematic diagram of roller-quenching technique
  • (iii) Sputtering
  • (iv) Glow-discharge decomposition
  • (v) Chemical vapour deposition (CVD)
  • (vi) Sol-gel method
  • 1.7 Types of Glasses
  • Table 1.1. Classification of glass forming materials interms of chemical bonding
  • (i) Oxide glasses
  • (ii) Chalcogenide glasses
  • (iii) Metallic glasses
  • 1.8 Structure of Glasses
  • 1.8.1 Structure of silicate glasses
  • 1.8.2 Structure of borate glasses
  • Fig.l.10. Structural groupings in borate glasses.
  • Boron oxide anomaly
  • 1.9 Research Work Undertaken in the Present Investigation
  • References
  • 2. EXPERIMENTAL TECHNIQUES
  • 2.1 Introduction
  • 2.2 Preparation of Glass Samples
  • 2.3 Measurement of d.c Conductivity
  • Fig. 2.1 Quenching device used for the preparation of glass samples.
  • Fig. 2.2 Cross-Sectional view of the conductivity cell.
  • Fig.2.3. Block diagram of the experimental set up for themeasurement of d.c conductivity using KeithleyElectrometer.
  • Fig. 2.4 Circuit diagram for the measurement of d.cconductivity.
  • 2.4 Measurement of Dielectric Constant and a.c Conductivity
  • 2.5 Ultrasonic Measurements
  • Pulse-echo overlap (PEO) method
  • Fig. 2.5 Pulse-echo overlap system.
  • Fig. 2.6 Overlapped broadband echoes from the pulse echo overlap system.
  • 2.6 Laser Raman Spectroscopy
  • References
  • 3. D.C.CONDUCTIVITY STUDIES ON CaO-B2O3-Al203-Na2O AND CaO-B203-Al203-Fe203 GLASS SYSTEMS
  • 3.1 Introduction
  • PART I REVIEW OF D.C.CONDUCTIVITY STUDIES ON OXIDE GLASSES CONTAINING ALKALI / TRANSITION-METAL OXIDES
  • 3.2 Introduction
  • 3.3 D.C Conductivity Studies on Oxide Glasses Containing Alakali Oxides -- A Review
  • 3.4 D.C Conductivity Studies on Oxide Glasses Containing Transition-Metal Oxides- A Review
  • PART II STUDY OF D.C CONDUCTIVITY IN CaO-B203 Al203-Na20 GLASS SYSTEM
  • 3.5 Introduction
  • 3.6 Experimental Details
  • 3.6.1 Glass composition
  • 3.6.2 Preparation of glass samples
  • 3.6.3 Measurement of d.c. conductivity in CaO-B2 03 -Al2O3-Na2O glass system
  • 3.7 Results and Discussion
  • 3.8 Conclusion
  • PART III STUDY OF D.C. CONDUCTIVITY IN CaO-B203 Al203-Fe203 GLASS SYSTEM
  • 3.9 Introduction
  • 3.10 Experimental Details
  • 3.11 Results and Discussion
  • 3.12 Conclusion
  • References
  • 4. DIELECTRIC CONSTANT AND A.C CONDUCTIVITY STUDIES ON CaO-B203-Al203-Na20 AND CaO-B203-Al203-Fe203 GLASS SYSTEMS
  • 4.1 Introduction
  • PART I REVIEW OF DIELECTRIC CONSTANT AND A.C. CONDUCTIVITY STUDIES ON OXIDE GLASSES CONTAINING ALKALI / TRANSITION METAL OXIDE
  • 4.2 Review
  • PART II STUDY OF DIELECTRIC CONSTANT AND A.C. CUNDUCTIVITY IN CaO-B203-Al203-Na20 GLASS SYSTEM
  • 4.3 Introduction
  • 4.4 Experimental Details
  • 4.4.1 Glass composition and measurement of dielectric constant and a.c conductivity
  • 4.5 Results and Discussion
  • (i) Dielectric constant
  • (ii) a.c. conductivity
  • 4.6 Conclusion
  • PART III STUDY OF DIELECTRIC CONSTANT AND A.C CONDUCTIVITY IN CaO-B203-Al203-Fe203 GLASS SYSTEM
  • 4.7 Introduction
  • 4.8 Experimental Details
  • 4.9 Results and Discussion
  • 4.10 Conclusion
  • References
  • 5. LASER RAMAN STUDIES ON QUARTERNARY GLASS SYSTEM CaO-B203-A12O3-Na2O AND CaO-B203-Al203-Fe203
  • 5.1 Introduction
  • 5.2 A Short Review
  • 5.3 Work Undertaken in the Present Study
  • 5.4 Experimental Details
  • 5.5 Results and Discussion
  • 5.6 Conclusion
  • References
  • 6. ULTRASONIC STUDIES ON CaO-B203-Al203-Na20 AND CaO-B203-Al203-Fe203 GLASS SYSTEMS
  • 6.1 Introduction
  • 6.2 Ultrasonic Investigations in Oxide Glasses -- A Brief Review
  • 6.3 Theory
  • 6.4 Work Undertaken in the Present Study
  • 6.5 Experimental Details
  • 6.6 Results and Discussion
  • 6.7 Conclusion
  • References