Observations of non-periodic and periodic defect structures in M7C3 carbides

Jean Paul Morniroli; M. Khachfi; Michel Gantois; Alain Courtois; J. Mahy; Dirk E.M. Van Dyck; J. Van Landuyt; S. Amelinckx; S. Amelinckx

doi:10.1080/01418618708204469

Observations of non-periodic and periodic defect structures in M₇C₃ carbides

Jean Paul Morniroli, M. Khachfi, Michel Gantois, Alain Courtois, J. Mahy, Dirk E.M. Van Dyck, J. Van Landuyt, S. Amelinckx, S. Amelinckx

Research output › peer-review

Abstract

A structural analysis of M₇C₃ (M=Fe, Cr, etc.) metal carbides is presented, using X-ray and electron diffraction as well as electron microscopy imaging techniques. It is shown that an orthorhombic superstructure occurs in three orientation variants referred to an underlying hexagonal lattice, which are separated by 1011-type twin planes and antiphase boundaries. The distribution of these defects can occur periodically, quasi-periodically or at random. They are characterized through analysis of the diffraction geometry. The structure is considered as being ‘interface modulated’, ‘polysynthetically twinned’ or as a microdomain structure, depending on the detailed arrangement of the defects. High-resolution electron microscopy is shown to be a powerful technique in the direct interpretation of both periodic and non-periodic defect structures.

Original language	English
Pages (from-to)	93-113
Number of pages	21
Journal	Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume	56
Issue number	1
DOIs	https://doi.org/10.1080/01418618708204469
State	Published - Jul 1987

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Materials Science
Condensed Matter Physics
Physics and Astronomy (miscellaneous)
Metals and Alloys

Access to Document

10.1080/01418618708204469

Cite this

Morniroli, J. P., Khachfi, M., Gantois, M., Courtois, A., Mahy, J., Van Dyck, D. E. M., Van Landuyt, J., Amelinckx, S., & Amelinckx, S. (1987). Observations of non-periodic and periodic defect structures in M₇C₃ carbides. Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, 56(1), 93-113. https://doi.org/10.1080/01418618708204469

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title = "Observations of non-periodic and periodic defect structures in M7C3 carbides",

abstract = "A structural analysis of M7C3 (M=Fe, Cr, etc.) metal carbides is presented, using X-ray and electron diffraction as well as electron microscopy imaging techniques. It is shown that an orthorhombic superstructure occurs in three orientation variants referred to an underlying hexagonal lattice, which are separated by 1011-type twin planes and antiphase boundaries. The distribution of these defects can occur periodically, quasi-periodically or at random. They are characterized through analysis of the diffraction geometry. The structure is considered as being {\textquoteleft}interface modulated{\textquoteright}, {\textquoteleft}polysynthetically twinned{\textquoteright} or as a microdomain structure, depending on the detailed arrangement of the defects. High-resolution electron microscopy is shown to be a powerful technique in the direct interpretation of both periodic and non-periodic defect structures.",

author = "Morniroli, {Jean Paul} and M. Khachfi and Michel Gantois and Alain Courtois and J. Mahy and {Van Dyck}, {Dirk E.M.} and {Van Landuyt}, J. and S. Amelinckx and S. Amelinckx",

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Morniroli, JP, Khachfi, M, Gantois, M, Courtois, A, Mahy, J, Van Dyck, DEM, Van Landuyt, J, Amelinckx, S & Amelinckx, S 1987, 'Observations of non-periodic and periodic defect structures in M₇C₃ carbides', Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, vol. 56, no. 1, pp. 93-113. https://doi.org/10.1080/01418618708204469

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T1 - Observations of non-periodic and periodic defect structures in M7C3 carbides

AU - Morniroli, Jean Paul

AU - Khachfi, M.

AU - Gantois, Michel

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AU - Mahy, J.

AU - Van Dyck, Dirk E.M.

AU - Van Landuyt, J.

AU - Amelinckx, S.

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N2 - A structural analysis of M7C3 (M=Fe, Cr, etc.) metal carbides is presented, using X-ray and electron diffraction as well as electron microscopy imaging techniques. It is shown that an orthorhombic superstructure occurs in three orientation variants referred to an underlying hexagonal lattice, which are separated by 1011-type twin planes and antiphase boundaries. The distribution of these defects can occur periodically, quasi-periodically or at random. They are characterized through analysis of the diffraction geometry. The structure is considered as being ‘interface modulated’, ‘polysynthetically twinned’ or as a microdomain structure, depending on the detailed arrangement of the defects. High-resolution electron microscopy is shown to be a powerful technique in the direct interpretation of both periodic and non-periodic defect structures.

AB - A structural analysis of M7C3 (M=Fe, Cr, etc.) metal carbides is presented, using X-ray and electron diffraction as well as electron microscopy imaging techniques. It is shown that an orthorhombic superstructure occurs in three orientation variants referred to an underlying hexagonal lattice, which are separated by 1011-type twin planes and antiphase boundaries. The distribution of these defects can occur periodically, quasi-periodically or at random. They are characterized through analysis of the diffraction geometry. The structure is considered as being ‘interface modulated’, ‘polysynthetically twinned’ or as a microdomain structure, depending on the detailed arrangement of the defects. High-resolution electron microscopy is shown to be a powerful technique in the direct interpretation of both periodic and non-periodic defect structures.

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