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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: Superconducting and Structural Properties of the HgBa2(Ca1-xYx)Cu2O6+δ System
Author(s): H.C. Ku, S.G. Chiou, C.C. Lai, and Y.B. You
Publication: Physica C Volume: 235 Issue: Not Available Year: 1994 Page(s): 923-924
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Vol. 235-240, multivolume issue
Keywords: Material Specification, Critical Temperature, Magnetic Susceptibility

Materials and Properties

Hg:1212; [Hg-Ba-Ca(Y)-Cu-O]
Material Specification for Hg:1212; [Hg-Ba-Ca(Y)-Cu-O] Process: Solid State Reaction
Notes: The authors cite R.L. Meng et al., Physica C, Vol. 216, 21 (1993), and summarize the procedure as follows. "All samples were synthesized by the two-step Hg-vapor/solid reaction method... The precursor and HgO-contained reactant pellets were sealed in evacuated quartz tube, placed in a stainless steel container and sintered at 820-850 °C for 5-12 h. The sintered samples were then post-annealed at 300 °C for 8 h in flowing oxygen atmosphere. Single-phase samples were verified through the powdered x-ray diffraction."
Formula: HgBa2Ca1-xYxCu2O6+y
Informal Name: Hg:1212
Chemical Family: Hg-Ba-Ca(Y)-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:1212; [Hg-Ba-Ca(Y)-Cu-O]
x of Yx (formula units) Critical Temperature (K)
0.0 125
0.2 107
0.3 100
0.4 82
0.5 0
Measurement Method: Susceptibility method
"...magnetic susceptibility... measurements were performed on powdered samples (zero field cooled)... Superconducting transition temperatures Tc from magnetic measurements were defined as the appearance of diamagnetic signal... The Tc onset was defined as the downturn of the paramagnetic signal." No additional measurement details were noted.

Cautions: Unevaluated Data
"No superconducting transition can be detected down to 5 K for x ≥ 0.5..." Digitized data were obtained from Fig. 3 of the paper.
Magnetic Susceptibility for Hg:1212; [Hg-Ba-Ca(Y)-Cu-O]
x of Yx (formula units) Temperature (K) Magnetic Susceptibility (arbitrary)
0.2 11 -1.8
0.2 20 -1.7
0.2 31 -1.6
0.2 41 -1.5
0.2 52 -1.4
0.2 62 -1.2
0.2 69 -0.93
0.2 75 -0.69
0.2 80 -0.39
0.2 86 -0.16
0.2 94 -0.008
0.2 100 -0.002
0.2 110 0
0.2 120 0
0.3 11 -0.82
0.3 20 -0.79
0.3 29 -0.70
0.3 37 -0.61
0.3 44 -0.49
0.3 51 -0.34
0.3 56 -0.25
0.3 63 -0.13
0.3 68 -0.044
0.3 100 0
0.4 10 -0.59
0.4 25 -0.44
0.4 37 -0.29
0.4 49 -0.14
0.4 58 -0.046
0.4 82 0
Measurement Method: Susceptibility method
"...magnetic susceptibility... measurements were performed on powdered samples (zero field cooled)... Superconducting transition temperatures Tc from magnetic measurements were defined as the appearance of diamagnetic signal... The Tc onset was defined as the downturn of the paramagnetic signal." No additional measurement details were noted.

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