Synthesis of HgPb1223 superconductor

Author

Li, Y. ; Sastry, P.V.P.S.S. ; Knoll, D.C. ; Peterson, S.C. ; Schwartz, J.

Author_Institution

Nat. High Magnetic Field Lab., Florida State Univ., Tallahassee, FL, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

1767

Lastpage

1770

Abstract

The synthesis and processing parameters that affect the phase purity and grain growth of Pb-doped Hg1223 were optimized. Samples were prepared from commercial BaCaCuO precursors using CaHgO/sub 2/ as the external Hg-source. Samples were quenched from high temperature at different stages of the reaction and their microstructures were investigated. The reaction and annealing conditions were optimized to improve the phase purity and microstructural homogeneity. The as-synthesized HgPb1223 samples were shown to be optimally doped and to exhibit T/sub c/ values in the range of 130-134 K. Post-annealing of the samples in flowing oxygen or argon at 300-400/spl deg/C did not improve T/sub c/ and deteriorated the magnetic hysteresis.

Keywords

annealing; barium compounds; calcium compounds; grain growth; high-temperature superconductors; lead compounds; magnetic hysteresis; materials preparation; mercury compounds; quenching (thermal); superconducting transition temperature; 130 to 134 K; 300 to 400 C; BaCaCuO precursors; CaHgO/sub 2/; HgPb1223 superconductor; HgPbBa/sub 2/Ca/sub 2/Cu/sub 3/O; Pb-doped Hg1223; T/sub c/; annealing conditions; grain growth; magnetic hysteresis; microstructural homogeneity; microstructures; phase purity; post-annealing; processing parameters; quenching; synthesis; Annealing; Argon; Chemical analysis; Educational institutions; Heat treatment; High temperature superconductors; Magnetic fields; Microstructure; Superconducting magnets; Superconducting transition temperature;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784797

Filename

784797