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The crystal structure of La0.7Pr0.3Ba2Cu3Od ceramic compound

Published online by Cambridge University Press:  05 March 2012

X. S. Wu ,
H. Sha ,
W. S. Tan ,
Tao Yu ,
A. Hu ,
S. S. Jiang ,
J. Wang  and
Y. F. Ding
X. S. Wu*
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Institute of Solid State Physics and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
H. Sha
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Institute of Solid State Physics and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
W. S. Tan
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Institute of Solid State Physics and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
Tao Yu
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Institute of Solid State Physics and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
A. Hu
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Institute of Solid State Physics and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
S. S. Jiang
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Institute of Solid State Physics and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
J. Wang
Affiliation:
BSRL, Institute of High Energy Physics, Beijing 100039, China
Y. F. Ding
Affiliation:
BSRL, Institute of High Energy Physics, Beijing 100039, China
*
a)Electronic mail: xswu@netra.nju.edu.cn
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Abstract

The structure of new La0.7Pr0.3Ba2Cu3Oy (LPBCO) compound was obtained at room temperature from synchrotron radiation X-ray powder diffraction data and refined by Rietveld technique. LPBCO has an isotypical structure with YBa2Cu3Oy (YBCO). The crystal data are: La0.7Pr0.3Ba2Cu3O6.96, Mr=716.16, orthorhombic system, space group Pmmm, a=3.9147(1) Å, b=3.8672(1) Å, c=11.7033(2) Å, V=177.177(6) Å3, Z=1, Dx=6.714 g/cm3; the structure was refined with 35 parameters to Rwp=7.41%, Rp=5.32%, and Rexp=3.07% for 5001 step intensities. Moreover, the total content of oxygen in a unit cell is refined as 6.96, which is less than that of the calculated one. We attribute the superconductivity-depression to the increase of the valence of copper.

Keywords

structure determinationRietveld analysispowder diffractionLa0.7Pr0.3Ba2Cu3Oy

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Type
New Diffraction Data
Information
Powder Diffraction , Volume 17 , Issue 1 , March 2002 , pp. 25 - 29
Copyright
Copyright © Cambridge University Press 2002

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