Free Access
Issue
Microsc. Microanal. Microstruct.
Volume 1, Number 2, April 1990
Page(s) 109 - 125
DOI https://doi.org/10.1051/mmm:0199000102010900
Microsc. Microanal. Microstruct. 1, 109-125 (1990)
DOI: 10.1051/mmm:0199000102010900

H.R.E.M study of the cuprate Sr2NdCu2O5.76

Maryvonne Hervieu, Vincent Caignaert, Claude Michel, Richard Retoux et Bernard Raveau

Laboratoire de cristallographie et Sciences des Matériaux ISMRA, Bd du Maréchal Juin, 14032 Caen Cedex, France


Abstract
The HREM study of the new oxide Sr2NdCu2O5.76 , whose structure is built up from the intergrowth of rock-salt and perovskite layers, is reported. The original distribution of the oxygen vacancies in the perovskite slabs, which led to two extrem structural models, is discussed. The microstructural study shows that, among the nonstoichiometric phenomena observed in the crystal, two appear common: intergrowth defects (n' = 3) and interconnections of layers which involve antiphase boundaries.


Résumé
L'étude par microscopie électronique haute résolution de l'oxyde Sr2NdCu2O5.76, récemment caractérisé, a été réalisée. La structure de cet oxyde est construite par intercroissance de couches de type NaCl et pérovskite. La distribution originale des lacunes oxygène, qui a conduit à deux modèles structuraux extrêmes, est discutée. L'étude microstructurale montre que, parmi les phénomènes de non stoéchiométrie observés, deux apparaissent comme très importants: les défauts d'intercroissance (n' = 3) et l'interconnexion de couches qui entraîne la formation de parois d'antiphase.

PACS
7472J - Other cuprates, including Tl and Hg-based cuprates.
6166F - Inorganic compounds.

Key words
Crystal structure -- Microstructure -- Intergrowth -- Crystal defects -- Nonstoichiometry -- Vacancies -- Antiphase domain -- High-Tc superconductors -- Strontium oxides -- Neodymium oxides -- Copper oxides -- Quaternary compounds


© EDP Sciences 1990

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