High pressure thermodynamic investigations on the Bi-Pb-Sr-Ca-Cu-O system

Author

Lomello-Tafin, M. ; Giannini, E. ; Walker, E. ; Cerutti, P. ; Seeber, B. ; Flukiger, R.

Author_Institution

DPMC, Geneva Univ., Switzerland

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3438

Lastpage

3441

Abstract

The lack of thermodynamic information concerning the Bi,Pb(2223)-liquid equilibrium has not made it possible, so far, to find any equilibrium formation route. The formation of Bi,Pb(2223) occurs via a non-equilibrium route, the grains growing from the local transient liquid. One of the main difficulties in solving the phase diagram at high temperature arises from an uncontrolled loss of some volatile elements and oxides. We have undertaken the investigation of the phase diagram at high pressure. A new prototype of High-Pressure DTA was built, operating up to 150 bar, and a dedicated High Isostatic Pressure furnace (up to 1 kbar, p(O₂)=0.2 bar) was used to anneal the samples without mass losses. We report on the effect of pressure on the Bi,Pb(2223) formation and decomposition, and on the influence of oxygen partial pressure under these conditions

Keywords

annealing; bismuth compounds; calcium compounds; differential thermal analysis; high-pressure effects; high-temperature superconductors; lead compounds; phase diagrams; phase equilibrium; strontium compounds; (BiPb)₂Sr₂Ca₂Cu₃O; annealing; high pressure; local transient liquid; oxygen partial pressure; phase diagram; thermal analysis; Annealing; Furnaces; High temperature superconductors; Phase detection; Powders; Prototypes; Reproducibility of results; Stability; Superconducting films; Thermodynamics;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919802

Filename

919802