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Volume 104, Number 3, May – June 1999

Journal of Research of the National Institute of Standards and Technology

J. Res. Natl. Inst. Stand. Technol.104, 277 (1999)

Primary Phase Field of the Pb-Doped 2223 High-T c Superconductor in the (Bi, Pb)-Sr-Ca-Cu-O System

W. Wong-Ng

L. P. Cook

A. Kearsley

National Institute of Standards and Technology
Gaithersburg, MD 20899-0001

W. Greenwood

University of Maryland
College Park, MD 20742

Table of Contents

1. Introduction
1.1. Powder-in-Tube Processing Technique
1.2. Phase Equilibrium Data
1.2.1. Phase Equilibrium Data
1.2.2. Previous Work at NIST
1.2.2.1. Phases in Equilibrium With the Pb-2223 Phase
1.2.2.2. Extent of Pb-Substitution
1.2.2.3. Five Phase Equilibrium Volumes of 2223–2212
1.3. General Approach to Obtaining the Primary Phase Field
2. Experimental Method
2.1. Five-Phase Equilibria Involving the Pb-2223 Phase
2.2. Determination of Liquid Composition
3. Results and Discussion
3.1. Five-Phase Compatibilities of Pb-2223 at 810 °C to 820 °C in 7.5 % O2
3.2. Initial Melting of the Five-Phase Volumes
3.3. The Primary Phase Field of the 2223 Phase
3.4. Graphical Representations
3.4.1. Subsolidus Phase Relationships
3.4.2. Primary Phase Field
3.5. Application of the Primary Phase Field
4. Summary and Future Needs
References