HREM on defects in Sr2Nd1.5Ce0.5NbCu2O10-δ

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

doi:10.1016/0921-4534(92)90443-G

HREM on defects in Sr₂Nd_1.5Ce_0.5NbCu₂O_10-δ

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

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Abstract

Defects occuring in Sr₂Nd_1.5Ce_0.5NbCu₂O_10-δ have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr₂Nd_1.5Ce_0.5NbCu₂O_10-δ consists of a block of layers CuO₂-SrO-NbO₂-SrO-CuO₂ having a perovskitelike structure sandwiched with a (Nd, Ce)-O₂-(Nd,Ce) block which has a fluorite-like stacking. Defects occur in which the number of (Nd, Ce) layers varies from 1 to 5, e.g. Sr₂(NdCe)_nNbCu₂O_6+2n-δ. The n=1 material was found to extend over a relatively larger area. n=2, n=3, n=4 and n=5 phases occur as single planar stacking faults. All n=1, 2, 3, 4, 5 structures have a_p√2, a_p√2, c superstructure, due to rotation of the NbO₆ octahedra about the c-axis. Quite frequently intergrowths occur with an approximate composition of Sr(Nb,Cu)O₃, which adopts the perovskite structure with a c-axis of 0.42 nm and with an ab plane which fits to the ab plane of Sr₂Nd_1.5Ce_0.5NbCu₂O_10-δ. The thickness of the intergrown Sr(Nb,Cu)O₃ is limited to 5 nm. The (Nb, Cu)O₆ octahedra in Sr(Nb, Cu)O₃ are also tilted about the c-axis but the amount of tilt is less than in Sr₂Nd_1.5Ce_0.5NbCu₂O_10-δ.

Original language	English (US)
Pages (from-to)	252-258
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	196
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(92)90443-G
State	Published - Jun 20 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(92)90443-G

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@article{cd2d119e5ddd4d9b9ac0ffd909b6088a,

title = "HREM on defects in Sr2Nd1.5Ce0.5NbCu2O10-δ",

abstract = "Defects occuring in Sr2Nd1.5Ce0.5NbCu2O10-δ have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2Nd1.5Ce0.5NbCu2O10-δ consists of a block of layers CuO2-SrO-NbO2-SrO-CuO2 having a perovskitelike structure sandwiched with a (Nd, Ce)-O2-(Nd,Ce) block which has a fluorite-like stacking. Defects occur in which the number of (Nd, Ce) layers varies from 1 to 5, e.g. Sr2(NdCe)nNbCu2O6+2n-δ. The n=1 material was found to extend over a relatively larger area. n=2, n=3, n=4 and n=5 phases occur as single planar stacking faults. All n=1, 2, 3, 4, 5 structures have ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis. Quite frequently intergrowths occur with an approximate composition of Sr(Nb,Cu)O3, which adopts the perovskite structure with a c-axis of 0.42 nm and with an ab plane which fits to the ab plane of Sr2Nd1.5Ce0.5NbCu2O10-δ. The thickness of the intergrown Sr(Nb,Cu)O3 is limited to 5 nm. The (Nb, Cu)O6 octahedra in Sr(Nb, Cu)O3 are also tilted about the c-axis but the amount of tilt is less than in Sr2Nd1.5Ce0.5NbCu2O10-δ.",

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

year = "1992",

month = jun,

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doi = "10.1016/0921-4534(92)90443-G",

language = "English (US)",

volume = "196",

pages = "252--258",

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T1 - HREM on defects in Sr2Nd1.5Ce0.5NbCu2O10-δ

AU - Zandbergen, H. W.

AU - Cava, R. J.

AU - Krajewski, J. J.

AU - Peck, W. F.

PY - 1992/6/20

Y1 - 1992/6/20

N2 - Defects occuring in Sr2Nd1.5Ce0.5NbCu2O10-δ have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2Nd1.5Ce0.5NbCu2O10-δ consists of a block of layers CuO2-SrO-NbO2-SrO-CuO2 having a perovskitelike structure sandwiched with a (Nd, Ce)-O2-(Nd,Ce) block which has a fluorite-like stacking. Defects occur in which the number of (Nd, Ce) layers varies from 1 to 5, e.g. Sr2(NdCe)nNbCu2O6+2n-δ. The n=1 material was found to extend over a relatively larger area. n=2, n=3, n=4 and n=5 phases occur as single planar stacking faults. All n=1, 2, 3, 4, 5 structures have ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis. Quite frequently intergrowths occur with an approximate composition of Sr(Nb,Cu)O3, which adopts the perovskite structure with a c-axis of 0.42 nm and with an ab plane which fits to the ab plane of Sr2Nd1.5Ce0.5NbCu2O10-δ. The thickness of the intergrown Sr(Nb,Cu)O3 is limited to 5 nm. The (Nb, Cu)O6 octahedra in Sr(Nb, Cu)O3 are also tilted about the c-axis but the amount of tilt is less than in Sr2Nd1.5Ce0.5NbCu2O10-δ.

AB - Defects occuring in Sr2Nd1.5Ce0.5NbCu2O10-δ have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2Nd1.5Ce0.5NbCu2O10-δ consists of a block of layers CuO2-SrO-NbO2-SrO-CuO2 having a perovskitelike structure sandwiched with a (Nd, Ce)-O2-(Nd,Ce) block which has a fluorite-like stacking. Defects occur in which the number of (Nd, Ce) layers varies from 1 to 5, e.g. Sr2(NdCe)nNbCu2O6+2n-δ. The n=1 material was found to extend over a relatively larger area. n=2, n=3, n=4 and n=5 phases occur as single planar stacking faults. All n=1, 2, 3, 4, 5 structures have ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis. Quite frequently intergrowths occur with an approximate composition of Sr(Nb,Cu)O3, which adopts the perovskite structure with a c-axis of 0.42 nm and with an ab plane which fits to the ab plane of Sr2Nd1.5Ce0.5NbCu2O10-δ. The thickness of the intergrown Sr(Nb,Cu)O3 is limited to 5 nm. The (Nb, Cu)O6 octahedra in Sr(Nb, Cu)O3 are also tilted about the c-axis but the amount of tilt is less than in Sr2Nd1.5Ce0.5NbCu2O10-δ.

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JF - Physica C: Superconductivity and its applications

IS - 3-4

ER -

HREM on defects in Sr₂Nd_1.5Ce_0.5NbCu₂O_10-δ

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