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Remarkable transition from rocksalt/perovskite layered structure to fluorite/rocksalt layered structure in rapidly cooled Ln2CuO4

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Irvine2013srep01504.pdf (620.0Kb)
Date
21/03/2013
Author
Patabendige, Chami Nilasha Kahakachchi
Azad, Abul Kalam
Connor, Paul Alexander
Rolle, Aurélie
Irvine, John Thomas Sirr
Keywords
ZIRCONIA
SUPERCONDUCTIVITY
CU-O SYSTEM
PHASE
COPPER OXIDES
OXYGEN
CRYSTAL-CHEMISTRY
COMPOUND
QD Chemistry
Metadata
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Abstract
Lanthanide cuprates of formula Ln2CuO4 exist in two principal forms, T and T′ which are renowned for their exhibition at low temperatures of hole and electronic types of superconductivity, respectively. These structures differ primarily in the arrangement of oxygen between the perovskite layers and also in nature of the copper oxygen planes. The Cu-O distance in the T structure (~1.90 Å) is much shorter than the T′ (1.97Å), reflecting a transition between partial Cu+ and partial Cu3+ character. In seeking to find compositions that bridge these two structure/electron carrier types, we observed the transition from a T structure to a T′ type structure, resulting in the metastable form T″ with slightly larger volume but similar character to T′. This transition from T to T″ is associated with 5% increase in a and a 5% decrease in c parameters of the tetragonal unit cells, which results in disintegration of ceramic bodies.
Citation
Patabendige , C N K , Azad , A K , Connor , P A , Rolle , A & Irvine , J T S 2013 , ' Remarkable transition from rocksalt/perovskite layered structure to fluorite/rocksalt layered structure in rapidly cooled Ln 2 CuO 4 ' Scientific Reports , vol 3 , 1504 . DOI: 10.1038/srep01504
Publication
Scientific Reports
Status
Peer reviewed
DOI
http://dx.doi.org/10.1038/srep01504
ISSN
2045-2322
Type
Journal article
Rights
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
Description
This work was supported by EPSRC
Collections
  • University of St Andrews Research
  • Chemistry Research
URI
http://hdl.handle.net/10023/3426

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