Microstructure of La1-XCaxMnO3 studied by transmission electron microscopy

Q. Chen; J. Tao; J. M. Zuo; John Spence

doi:10.1557/JMR.2001.0406

Microstructure of La_1-XCa_xMnO₃ studied by transmission electron microscopy

Q. Chen, J. Tao, J. M. Zuo, John Spence

Physics

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Microstructures of La_1-xCa_xMnO₃ compounds (x = 1/3 and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector 1/2〈111〉, indexed in orthorhombic unit cell, has been observed in bulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to be due to the symmetry breaking introduced by the tilting of MnO₆ octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.

Original language	English (US)
Pages (from-to)	2959-2965
Number of pages	7
Journal	Journal of Materials Research
Volume	16
Issue number	10
DOIs	https://doi.org/10.1557/JMR.2001.0406
State	Published - Oct 2001

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1557/JMR.2001.0406

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title = "Microstructure of La1-XCaxMnO3 studied by transmission electron microscopy",

abstract = "Microstructures of La1-xCaxMnO3 compounds (x = 1/3 and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector 1/2〈111〉, indexed in orthorhombic unit cell, has been observed in bulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to be due to the symmetry breaking introduced by the tilting of MnO6 octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.",

author = "Q. Chen and J. Tao and Zuo, {J. M.} and John Spence",

note = "Funding Information: The first author thanks Professor M. O{\textquoteright}Keefe and Dr. Bin Jiang for useful discussions. This work was supported by National Science Foundation Award DMR9973894.",

year = "2001",

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doi = "10.1557/JMR.2001.0406",

language = "English (US)",

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pages = "2959--2965",

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T1 - Microstructure of La1-XCaxMnO3 studied by transmission electron microscopy

AU - Chen, Q.

AU - Tao, J.

AU - Zuo, J. M.

AU - Spence, John

N1 - Funding Information: The first author thanks Professor M. O’Keefe and Dr. Bin Jiang for useful discussions. This work was supported by National Science Foundation Award DMR9973894.

PY - 2001/10

Y1 - 2001/10

N2 - Microstructures of La1-xCaxMnO3 compounds (x = 1/3 and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector 1/2〈111〉, indexed in orthorhombic unit cell, has been observed in bulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to be due to the symmetry breaking introduced by the tilting of MnO6 octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.

AB - Microstructures of La1-xCaxMnO3 compounds (x = 1/3 and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector 1/2〈111〉, indexed in orthorhombic unit cell, has been observed in bulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to be due to the symmetry breaking introduced by the tilting of MnO6 octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.

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Microstructure of La_1-XCa_xMnO₃ studied by transmission electron microscopy

Abstract

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