Hts Logo

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: X-ray Single-Crystal Structure Refinement of the 129 K Superconductor HgxPb1-xBa2Ca3Cu4O10+δ
Author(s): H. Schwer, J. Karpinski, K. Conder, L. Lesne, C. Rossel, A. Morawski, T. Lada, and A. Paszewin
Publication: Physica C Volume: 243 Issue: Not Available Year: 1995 Page(s): 10-18
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Magnetic Susceptibility

Materials and Properties

Hg:1234; [Hg(Pb)-Ba-Ca-Cu-O]
Material Specification for Hg:1234; [Hg(Pb)-Ba-Ca-Cu-O] Process: Crystal Growth
Notes: "A gas-phase high-pressure technique was developed which allowed the growth of Hg-12(n-1)n single crystals of millimeter size. The experimental high-pressure system consists of a 15 kbar gas compressor and a piston cylinder pressure chamber with an internal three-zone Kanthal furnace. ... Mixtures of stoichiometric Hg-1223 with 10-20 at.% PbO were used for crystal growth. The growth was performed at p =10 kbar and maximum temperature T=1050-1070 °C. The sample was cooled down to 1020 °C at a rate of 5-20 °C/h, followed by a cooling rate of 5 °C/min to 860 °C. The sample was annealed for two hours at this temperature and afterwards cooled down to room temperature."
Formula: Hg0.8Pb0.2Ba2Ca3Cu4O10.14
Informal Name: Hg:1234
Chemical Family: Hg(Pb)-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Hg:1234; [Hg(Pb)-Ba-Ca-Cu-O]
Crystal System: Tetragonal
Formula Units per Cell:
Space Group: P4/mmm
Cell Parameters
Temp K a Å b Å c Å
296 3.8530(5) -- 18.968(3)
Atomic Coordinates
Atom Temp K a-axis b-axis c-axis
Hg/Pb 296 0 0 0
Ba 296 0.5 0.5 0.14375(2)
Ca(1) 296 0.5 0.5 0.32976(7)
Ca(2) 296 0.5 0.5 0.5
Cu(1) 296 0 0 0.24840(4)
Cu(2) 296 0 0 0.41592(4)
O(1) 296 0 0 0.1059(4)
O(2) 296 0 0.5 0.2507(2)
O(3) 296 0 0.5 0.4167(2)
O(4) 296 0.5 0.5 0
Measurement Method: X-ray diffraction
"The crystals were measured on a four-circle single-crystal diffractometer (Siemens P4) at 20 °C, using graphite monochromatized MoKα radiation (wavelength = 0.71073 σ). Intensity profiles were scanned in the omega-2θ mode and check reflections were measured every 50 reflections. 4934 reflections were collected of the whole Ewald sphere in the range 3°<2ϑ<70°. The intensity data were corrected for Lorentz polarization effects, and analytical absorption correction were applied. The dimensions of the crystal were 250x250x12 µm3. Averaging of the data in the Laue group P4/mmm yielded 459 symmettry independent reflections at an internal Ri=0.047. Absorption corrections and structure refinements were calculated with the program SHELXTL."

Cautions: Evaluated Data
Critical Temperature for Hg:1234; [Hg(Pb)-Ba-Ca-Cu-O]
Tc(Midpoint) (K) Critical Temperature (K)
100 120
Measurement Method: SQUID magnetometer
"The superconducting transition temperature Tc was determined from the magnetization, M(T), measured with a BTI SQUID magnetometer... taken in the zero-field cooled mode with magnetic field (3 mT) applied parallel to the c-axis."

Cautions: Evaluated Data
Magnetic Susceptibility for Hg:1234; [Hg(Pb)-Ba-Ca-Cu-O]
Temperature (K) Magnetic Susceptibility (arbitrary)
4 -0.48
41 -0.48
66 -0.47
82 -0.46
94 -0.43
99 -0.27
103 -0.11
106 -0.04
115 -0.01
139 0.00
Measurement Method: SQUID magnetometer
"The superconducting transition temperature Tc was determined from the magnetization, M(T), measured with a BTI SQUID magnetometer... taken in the zero-field cooled mode with magnetic field (3 mT) applied parallel to the c-axis."

Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.