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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: Single-Crystal Growth and Characterization of YBa2Cu4O8 with Tc about 80 K
Author(s): B. Dabrowski, K. Zhang, J.J. Pluth, J.L. Wagner, and D.G. Hinks
Publication: Physica C Volume: 202 Issue: Not Available Year: 1992 Page(s): 271-276
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Density (mass), Crystallography

Materials and Properties

Y:124; [Y-Ba-Cu-O]
Material Specification for Y:124; [Y-Ba-Cu-O] Process: Solid State Reaction
Notes: "The high-pressure crystal growth was done from mixtures of polycrystalline Y123, BaCuO2 and CuO. The Y123 and BaCuO2 were synthesized from oxides and carbonates (at least 99.9% purity) in flowing oxygen at 900 °C, followed by slowly cooling to room temperature. The Y123, BaCuO2 and CuO were mixed in appropriate ratios to obtain the desired starting composition. The high-pressure crystal growth was done using 20% O2 in argon at a total pressure of (0.3 GPa = 3 kbar) (with (60 MPa = 600 bar) O2 pressure). The large capacity vertical HIP furnace (inside diameter=8 cm and height=16 cm) was manufactured by ISO-SPECTRUM Inc."
Formula: YBa2Cu4O8
Informal Name: Y:124
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Density (mass) for Y:124; [Y-Ba-Cu-O]
Density (g cm-3)
6.13
Measurement Method: X-ray diffraction
"Single-crystal X-ray diffraction experiments were carried out using a Picker-Krisel four circle diffractometer... Single-crystal X-ray diffraction experiments have been carried out at room temperature for crystals grown in both alumina and zirconia crucibles. Crystals were first trimmed to sub-millimeter size and mounted on the tip of glass fibers using epoxy. A total of 3466 diffractions were collected for each sample with 576 of them being unique... At this time, no absorption corrections have been applied to the data because the samples were small and could not be measured accurately... The 2θ range (deg) (was) 3.5-70.0."

Cautions:
Crystallography for Y:124; [Y-Ba-Cu-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group: Ammm
Cell Parameters
Crucible Material () Temp K a Å b Å c Å
Alumina 296 3.8374(3) 3.8704(4) 27.213(3)
Zirconia 296 3.8378(4) 3.8686(4) 27.218(2)
Atomic Coordinates
Crucible Material () Atom Temp K a-axis b-axis c-axis
Zirconia Y 296 0.5 0.5 0.0
Zirconia Ba 296 0.5 0.5 0.13480(2)
Zirconia Cu(1) 296 0.0 0.0 0.21300(3)
Zirconia Cu(2) 296 0.0 0.0 0.06153(3)
Zirconia O(1) 296 0.0 0.0 0.1453(2)
Zirconia O(2) 296 0.5 0.0 0.0521(2)
Zirconia O(3) 296 0.0 0.5 0.0523(2)
Zirconia O(4) 296 0.0 0.5 0.2180(2)
Measurement Method: X-ray diffraction
"Single-crystal X-ray diffraction experiments were carried out using a Picker-Krisel four circle diffractometer... Single-crystal X-ray diffraction experiments have been carried out at room temperature for crystals grown in both alumina and zirconia crucibles. Crystals were first trimmed to sub-millimeter size and mounted on the tip of glass fibers using epoxy. A total of 3466 diffractions were collected for each sample with 576 of them being unique... At this time, no absorption corrections have been applied to the data because the samples were small and could not be measured accurately... The 2θ range (deg) (was) 3.5-70.0."

Cautions: Evaluated Data