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NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Superconductivity Above 130 K in the Hg-Ba-Ca-Cu-O System
Author(s): A. Schilling, M. Cantoni, J.D. Guo and H.R. Ott
Publication: Nature Volume: 363 Issue: Not Available Year: 1993 Page(s): 56-58
Editor(s): Not Available
Publisher: Macmillan Magazines Ltd.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Magnetic Susceptibility

Materials and Properties

Hg:1223; [Hg-Ba-Ca-Cu-O]
Material Specification for Hg:1223; [Hg-Ba-Ca-Cu-O] Process: Solid State Reaction
Notes: The authors cite S.N. Putilin et al., Nature, Vol. 362, 226-228 (1993), and summarize the procedure as follows. "A precursor material with the nominal composition Ba2CaCu2O5 was obtained from a well ground mixture of the respective metal nitrates, sintered at 900 °C in O2. After regrinding and mixing with powdered HgO, the pressed pellets were sealed in evacuated quartz tubes. These tubes were placed horizontally in tight steel containers and held at 800 °C for 5 h... Some of the pellets were finally annealed for 5 h at 300 °C in flowing oxygen. During the preparation and the characterization of the samples, all possible measures were taken to avoid any contamination with toxic mercury or mercury-containing compounds... EDX analysis showed that the samples are composites of isolated grains of BaCuO2 ( (about) 30%), CuO ( (about) 30%), an unidentified oxide containing Hg, Ca and Cu ( (about) 15%), an oxide with Ca and Cu ( (about) 5%), and (about) 5% impurities with unspecified composition. About 15% of the total sample volume consisted of plate-like grains containing Hg, Ba, Ca and Cu... these identified grains consist mostly of pure HgBa2Ca2Cu3O8+x (Hg-1223), disordered mixtures of Hg-1223 and Hg-1212, and a periodic stacking sequence of the latter unit cells."
Formula: HgBa2Ca2Cu3O8+y
Informal Name: Hg:1223
Chemical Family: Hg-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Hg:1223; [Hg-Ba-Ca-Cu-O]
Critical Temperature (K)
133.5
Measurement Method: SQUID magnetometer
"We measured the magnetic susceptibility of the specimens using a SQUID-magnetometer (Quantum Design). Zero-field cooling (ZFC) and field cooling (FC) susceptibilities (were) measured in H = (2.1 kA/m = 27 Oe). The ZFC curve indicates the presence of several different superconducting phases."

Cautions: Evaluated Data
Magnetic Susceptibility for Hg:1223; [Hg-Ba-Ca-Cu-O]
Cooling Method () Temperature (K) Magnetic Susceptibility (arbitrary)
FC 5 -0.001
FC 29 -0.001
FC 56 -0.001
FC 85 -0.001
FC 108 -0.001
FC 126 -0.001
FC 133 -0.001
FC 134 0
FC 150 0
ZFC 4 -0.014
ZFC 29 -0.014
ZFC 52 -0.013
ZFC 80 -0.012
ZFC 101 -0.010
ZFC 114 -0.007
ZFC 123 -0.004
ZFC 132 -0.001
ZFC 134 0
Measurement Method: SQUID magnetometer
"We measured the magnetic susceptibility of the specimens using a SQUID-magnetometer (Quantum Design). Zero-field cooling (ZFC) and field cooling (FC) susceptibilities (were) measured in H = (2.1 kA/m = 27 Oe). The ZFC curve indicates the presence of several different superconducting phases."

Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.