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: Neutron Diffraction Study of Pr Valence and Oxygen Ordering in the Y1-xPrxBa2Cu3O7-δ System
Author(s): J.J. Neumeier, T. Bjornholm, M.B. Maple, J.J. Rhyne, and J.A. Gotaas
Publication: Physica C Volume: 166 Issue: Not Available Year: 1990 Page(s): 191-196
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature

Materials and Properties

Y:123; [Y(Pr)-Ba-Cu-O]
Material Specification for Y:123; [Y(Pr)-Ba-Cu-O] Process: Solid State Reaction
Notes: "Specimens were prepared by mixing and grinding the appropriate amounts of 99.99% pure Y2O3, Pr6O11, BaCO3 and CuO powders. The powders were fired four times in air for 24 h with intermediate grindings, subsequently reground, pressed into pellets, and fired at 950 °C in (0.1 MPa = 1 atm) of oxygen for 3 days. Next, they were cooled to 630 °C at a rate of 1 °C/min, soaked overnight, and finally cooled at 1 °C/min to 400 °C, after which the furnace was switched off and allowed to cool to room temperature before removal of the specimens."
Formula: Y1-xPrxBa2Cu3O7-y
Informal Name: Y:123
Chemical Family: Y(Pr)-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Y:123; [Y(Pr)-Ba-Cu-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group:
Cell Parameters
x of Prx (formula units) y of Oy (formula units) Temp K a Å b Å c Å
0.0 6.98(1) 296 3.8229(1) 3.8865(1) 11.6821(4)
0.2 7.02(2) 296 3.8349(2) 3.8978(2) 11.6852(3)
0.4 7.00(2) 296 3.8450(2) 3.9052(2) 11.6903(6)
0.6 6.98(2) 296 3.8528(2) 3.9132(2) 11.7022(6)
1.0 7.08(4) 296 3.8783(2) 3.9281(2) 11.7186(7)
Atomic Coordinates
x of Prx (formula units) y of Oy (formula units) Atom Temp K a-axis b-axis c-axis
0.0 6.98 Y 296 0.5 0.5 0.5
0.0 6.98 Ba 296 0.5 0.5 0.1846
0.0 6.98 Cu(1) 296 0 0 0
0.0 6.98 Cu(2) 296 0 0 0.3552
0.0 6.98 O(1) 296 0 0 0.1578
0.0 6.98 O(2) 296 0.5 0 0.3779
0.0 6.98 O(3) 296 0 0.5 0.3780
0.2 7.02 Y 296 0.5 0.5 0.5
0.2 7.02 Ba 296 0.5 0.5 0.1835
0.2 7.02 Cu(1) 296 0 0 0
0.2 7.02 Cu(2) 296 0 0 0.3547
0.2 7.02 O(1) 296 0 0 0.1583
0.2 7.02 O(2) 296 0.5 0 0.3772
0.2 7.02 O(3) 296 0 0.5 0.3769
0.4 7.00 Y 296 0.5 0.5 0.5
0.4 7.00 Ba 296 0.5 0.5 0.1834
0.4 7.00 Cu(1) 296 0 0 0
0.4 7.00 Cu(2) 296 0 0 0.3523
0.4 7.00 O(1) 296 0 0 0.1583
0.4 7.00 O(2) 296 0.5 0 0.3755
0.4 7.00 O(3) 296 0 0.5 0.3754
0.6 6.98 Y 296 0.5 0.5 0.5
0.6 6.98 Ba 296 0.5 0.5 0.1812
0.6 6.98 Cu(1) 296 0 0 0
0.6 6.98 Cu(2) 296 0 0 0.3515
0.6 6.98 O(1) 296 0 0 0.1591
0.6 6.98 O(2) 296 0.5 0 0.3750
0.6 6.98 O(3) 296 0 0.5 0.3738
1.0 7.08 Y 296 0.5 0.5 0.5
1.0 7.08 Ba 296 0.5 0.5 0.1801
1.0 7.08 Cu(1) 296 0 0 0
1.0 7.08 Cu(2) 296 0 0 0.3497
1.0 7.08 O(1) 296 0 0 0.1580
1.0 7.08 O(2) 296 0.5 0 0.3755
1.0 7.08 O(3) 296 0 0.5 0.3680
Measurement Method: Neutron diffraction
"The samples were reground into a coarse powder and placed in a vanadium cannister with a diameter of... 1 cm for the neutron diffraction measurements which were made on the five-counter diffractometer at the NBS Reactor at the National Institute of Standards and Technology. The structural refinements were performed using the Rietveld total profile refinement method..." No additional measurement details were noted.

Cautions: Evaluated Data
Critical Temperature for Y:123; [Y(Pr)-Ba-Cu-O]
x of Prx (formula units) y of Oy (formula units) T (K) Critical Temperature (K)
0.2 7.02 75.5 71.5
0.4 7.00 47.5 43.5
0.6 6.98 3.8
Measurement Method: Electrical Resistance

Cautions: Unevaluated Data
No measurement details were noted. The temperature T0.1 at which the resistivity one-tenth of the extrapolated normal state resistivity is used as Tc. T0.9 is used as Tc,onset.