MT29 Abstracts and Technical Program

Wed-Mo-Po.03-05: A study of the effects of CO2 and H2O on Bi-2212 properties

2 Jul 2025, 09:15

2h

Ensemble Ballroom, Level 2

Poster Wed-Mo-Po.03 - HTS Characterization I

Speaker

Tanmay Sarker Shuvo (National High Magnetic Field Laboratory, Applied Superconductivity Center, Florida State University, Tallahassee, FL, USA)

Description

High $J_c$ in Bi-2212 wires is crucial for their use in high-field magnets. $CO_2$ and $H_2O$, which can inadvertently be incorporated into Bi-2212 wire, negatively impacts $J_c$. At room temperature before the heat treatment, $CO_2$ and $H_2O$ are present in the wires as carbonates, hydrates, or surface adsorbates, but during the overpressure heat treatment they become gases. The overpressure heat treatment compresses the $CO_2$ and $H_2O$ gases preventing these gases from forming bubbles during the heat treatment. On cooling, they can form carbonates and hydrates in the fully processed Bi-2212 ceramic that degrade $J_c$. This study investigates the $J_c$ performance of Bi-2212 wires with different $CO_2$ and $H_2O$ contents.

This work was supported by the U.S. DOE Office of High Energy Physics under Grant DE-SC0010421, by the NSF NHMFL under Award DMR- 2128556, and by the State of Florida, and was performed under the purview of the U.S. Magnet Development Program (MDP).