Synthesis and structure of a new perovskite, SrCuO2.5

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1996
Editor: 
Journal Title: 
Journal of Solid State Chemistry
Journal Date: 
Feb 1
Place Published: 
Tertiary Title: 
Volume: 
121
Issue: 
2
Pages: 
498-501
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Publisher: 
ISBN Number: 
0022-4596
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:A1996TX18000035
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Abstract: 

A new oxygen-deficient perovskite, SrCuO2.5, was prepared at 950 degrees C and 100 kbar pressure in a multianvil apparatus. Rietveld profile analysis, using X-ray powder diffraction data, was employed for the structural determination. SrCuO2.5, is orthorhombic, Pbam (No. 55), Z = 4, a = 5.424(2) Angstrom, b = 10.837(4) Angstrom, and c = 3.731(1) Angstrom, which is related to the perovskite subcell by root 2a(p) x 2 root 2a(p) x a(p), where a(p) is the simple cubic perovskite lattice parameter. It consists of corner-shared CuO5 square pyramids with oxygen vacancy ordering in the CuO2 layers. The ordered oxygen vacancies create parallel pseudo-hexagonal tunnels where the Sr atoms reside, forming SrO10 polyhedra. Structural features with respect to oxygen vacancies, superstructures, and distortions are analogous to the type of ordering observed in Sr2CuO3+delta. Superconductivity was not observed in SrCuO2.5 down to 5 K. (C) 1996 Academic Press, Inc.

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Tx180Times Cited:1Cited References Count:18

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