TY - JOUR
T1 - One-step reaction and consolidation of Hg based high-temperature superconductors by hot isostatic pressing
AU - Lechter, William
AU - Toth, Louis
AU - Osofsky, Michael
AU - Skelton, Earl
AU - Soulen, R. J.
AU - Qadri, Syed
AU - Schwartz, Justin
AU - Kessler, Joerg
AU - Wolters, Christian
N1 - Funding Information:
We thank Ken Killian for his help operating the HIP and for sealing many samples, and mndy Drews for helpful discussions. We also acknowledge the financial support of both NRL (ONR) and ARPA. We thank Don Gubser for his continuing interest in this project and for his measurements on samples at the National High Magnetic Field Laboratory which is supported by the National Science Foundation. We also thank the Materials Technology Center (MARTECH) at Florida State University for use of the SEM.
PY - 1995/7/15
Y1 - 1995/7/15
N2 - A hot isostatic press (HIP) techniques has been used successfully to react and consolidate in one step the Hg based high-temperature superconductors (HTS's). Hot isostatic pressing (HIPping) overcomes some of the problems encountered in the quartz encapsulation technique typically used to make Hg based HTS samples, such as containing the high vapor pressures of Hg and avoiding explosions. The HIPping conditions for processing (i.e., range of temperature and pressure) are significantly different from those used in the quartz-encapsulation method. These differences seem to relax the stringent conditions on precursor processing required in other processing methods. Hg based HTS samples were successfully made from both nitrate and carbonate precursors, as well as from commercially available precursors. X-ray diffraction experiments indicated that the best materials were made with nitrate precursors and were composed of 1223 phase (66%), 1212 phase (33%) and a small amount of BaCuO2 (1%). We have HIPped powders and contained them in selected high-purity metal foils. We find that Au is a good containment material for processing as it reacts very little with the Hg compounds being formed. Ag, on the other hand, reacts extensively. Samples with densities as high as 97% of theoretical density were formed. This technique has been used to successfully fabricate component that may lead directly to devices.
AB - A hot isostatic press (HIP) techniques has been used successfully to react and consolidate in one step the Hg based high-temperature superconductors (HTS's). Hot isostatic pressing (HIPping) overcomes some of the problems encountered in the quartz encapsulation technique typically used to make Hg based HTS samples, such as containing the high vapor pressures of Hg and avoiding explosions. The HIPping conditions for processing (i.e., range of temperature and pressure) are significantly different from those used in the quartz-encapsulation method. These differences seem to relax the stringent conditions on precursor processing required in other processing methods. Hg based HTS samples were successfully made from both nitrate and carbonate precursors, as well as from commercially available precursors. X-ray diffraction experiments indicated that the best materials were made with nitrate precursors and were composed of 1223 phase (66%), 1212 phase (33%) and a small amount of BaCuO2 (1%). We have HIPped powders and contained them in selected high-purity metal foils. We find that Au is a good containment material for processing as it reacts very little with the Hg compounds being formed. Ag, on the other hand, reacts extensively. Samples with densities as high as 97% of theoretical density were formed. This technique has been used to successfully fabricate component that may lead directly to devices.
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U2 - 10.1016/0921-4534(95)00280-4
DO - 10.1016/0921-4534(95)00280-4
M3 - Article
AN - SCOPUS:0029343169
SN - 0921-4534
VL - 249
SP - 213
EP - 219
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 3-4
ER -