High resolution electron microscopy study of Sr2NdNbCu2O8

H. W. Zandbergen; R. J. Cava; J. J. Krajewski; W. F. Peck

doi:10.1016/0022-4596(92)90187-Z

High resolution electron microscopy study of Sr₂NdNbCu₂O₈

H. W. Zandbergen, R. J. Cava, J. J. Krajewski, W. F. Peck

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9 Scopus citations

Abstract

The structure of Sr₂NdNbCu₂O₈ (tetragonal, space group P4bm, a = 0.549, c = 1.166 nm) and crystallographic defects occurring therein have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr₂NdNbCu₂O₈ consists of a layer sequence NdCuO₂SrONbO₂SrOCuO₂ having a perovskite-like structure. This structure is very similar to that of YBa₂Cu₃O₇: Y is replaced by Nd and the CuO layer by a NbO₂ layer. Sr₂NdNbCu₂O₈ has an a_p√2, a_p√2, c superstructure, due to rotation of the NbO₆ octahedra about the c-axis, leading to a space group P4bm. This superstructure is often short range. Intergrowths occur with an approximate composition of Sr(Nb, Cu)O₃, which adopts a modified simple perovskite structure. Also, examples are shown of [110] 90° rotation twins and edge dislocations.

Original language	English (US)
Pages (from-to)	322-330
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	101
Issue number	2
DOIs	https://doi.org/10.1016/0022-4596(92)90187-Z
State	Published - Dec 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0022-4596(92)90187-Z

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title = "High resolution electron microscopy study of Sr2NdNbCu2O8",

abstract = "The structure of Sr2NdNbCu2O8 (tetragonal, space group P4bm, a = 0.549, c = 1.166 nm) and crystallographic defects occurring therein have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2NdNbCu2O8 consists of a layer sequence NdCuO2SrONbO2SrOCuO2 having a perovskite-like structure. This structure is very similar to that of YBa2Cu3O7: Y is replaced by Nd and the CuO layer by a NbO2 layer. Sr2NdNbCu2O8 has an ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis, leading to a space group P4bm. This superstructure is often short range. Intergrowths occur with an approximate composition of Sr(Nb, Cu)O3, which adopts a modified simple perovskite structure. Also, examples are shown of [110] 90° rotation twins and edge dislocations.",

author = "Zandbergen, {H. W.} and Cava, {R. J.} and Krajewski, {J. J.} and Peck, {W. F.}",

year = "1992",

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doi = "10.1016/0022-4596(92)90187-Z",

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volume = "101",

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journal = "Journal of Solid State Chemistry",

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AU - Zandbergen, H. W.

AU - Cava, R. J.

AU - Krajewski, J. J.

AU - Peck, W. F.

PY - 1992/12

Y1 - 1992/12

N2 - The structure of Sr2NdNbCu2O8 (tetragonal, space group P4bm, a = 0.549, c = 1.166 nm) and crystallographic defects occurring therein have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2NdNbCu2O8 consists of a layer sequence NdCuO2SrONbO2SrOCuO2 having a perovskite-like structure. This structure is very similar to that of YBa2Cu3O7: Y is replaced by Nd and the CuO layer by a NbO2 layer. Sr2NdNbCu2O8 has an ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis, leading to a space group P4bm. This superstructure is often short range. Intergrowths occur with an approximate composition of Sr(Nb, Cu)O3, which adopts a modified simple perovskite structure. Also, examples are shown of [110] 90° rotation twins and edge dislocations.

AB - The structure of Sr2NdNbCu2O8 (tetragonal, space group P4bm, a = 0.549, c = 1.166 nm) and crystallographic defects occurring therein have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2NdNbCu2O8 consists of a layer sequence NdCuO2SrONbO2SrOCuO2 having a perovskite-like structure. This structure is very similar to that of YBa2Cu3O7: Y is replaced by Nd and the CuO layer by a NbO2 layer. Sr2NdNbCu2O8 has an ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis, leading to a space group P4bm. This superstructure is often short range. Intergrowths occur with an approximate composition of Sr(Nb, Cu)O3, which adopts a modified simple perovskite structure. Also, examples are shown of [110] 90° rotation twins and edge dislocations.

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JO - Journal of Solid State Chemistry

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High resolution electron microscopy study of Sr₂NdNbCu₂O₈

Abstract

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