The vacancy order - disorder transition in Ba2YCu3O7-δ observed by means of electron diffraction and electron microscopy

G. Van Tendeloo; Henny W. Zandbergen; S. Amelinckx

doi:10.1016/0038-1098(87)90862-3

The vacancy order - disorder transition in Ba₂YCu₃O_7-δ observed by means of electron diffraction and electron microscopy

G. Van Tendeloo, Henny W. Zandbergen, S. Amelinckx

Research output › peer-review

Abstract

It is shown by means of electron microscopy and electron diffraction that the "structural" vacancies in Ba₂YCu₃O_7-δ undergo an order-disorder transformation accompanied by a change in symmetry from orthorhombic to tetragonal. A superstructure due to the ordering of vacancies was found in certain crystal parts; it leads to doubling of the a₀ parameter. It is shown that the ordering of the vacancies is important for the superconducting behaviour. In order to obtain a high T_c supraconductor the final heat treatment is crucial.

Original language	English
Pages (from-to)	603-606
Number of pages	4
Journal	Solid State Communications
Volume	63
Issue number	7
DOIs	https://doi.org/10.1016/0038-1098(87)90862-3
State	Published - Aug 1987

Funding

This work was performed under the auspices of the Institute for Materials Science of the University of Antwerp in association with SCK/CEN (Mel) and sponsored by IIKW.

Funders	Funder number
University of Antwerp

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/0038-1098(87)90862-3

Cite this

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abstract = "It is shown by means of electron microscopy and electron diffraction that the {"}structural{"} vacancies in Ba2YCu3O7-δ undergo an order-disorder transformation accompanied by a change in symmetry from orthorhombic to tetragonal. A superstructure due to the ordering of vacancies was found in certain crystal parts; it leads to doubling of the a0 parameter. It is shown that the ordering of the vacancies is important for the superconducting behaviour. In order to obtain a high Tc supraconductor the final heat treatment is crucial.",

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AB - It is shown by means of electron microscopy and electron diffraction that the "structural" vacancies in Ba2YCu3O7-δ undergo an order-disorder transformation accompanied by a change in symmetry from orthorhombic to tetragonal. A superstructure due to the ordering of vacancies was found in certain crystal parts; it leads to doubling of the a0 parameter. It is shown that the ordering of the vacancies is important for the superconducting behaviour. In order to obtain a high Tc supraconductor the final heat treatment is crucial.

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