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

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/0038-1098(87)90862-3

Cite this

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

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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AU - Van Tendeloo, G.

AU - Zandbergen, Henny W.

AU - Amelinckx, S.

PY - 1987/8

Y1 - 1987/8

N2 - 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.

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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DO - 10.1016/0038-1098(87)90862-3

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