Neutron diffraction study on the Heusler compound Co1.50TiSn and its nitrogenation products

Tatsuhito Nobata; Go Nakamoto; Makio Kurisu; Yoshikazu Makihara; Kenji Ohoyama; Masayoshi Ohashi

doi:10.1016/S0925-8388(02)00402-4

Neutron diffraction study on the Heusler compound Co_1.50TiSn and its nitrogenation products

Tatsuhito Nobata, Go Nakamoto, Makio Kurisu, Yoshikazu Makihara, Kenji Ohoyama, Masayoshi Ohashi

金属材料研究所

研究成果: Article › 査読

13 被引用数 (Scopus)

抄録

Neutron powder diffraction studies have been performed for the Heusler compound 'CoTiSn' prepared from stoichiometric amounts of the constituent elements and its nitrogenation products. The Rietveld refinement indicates that the 'CoTiSn' sample consists of three phases: Co+Ti+Sn→0.69Co_1.50TiSn+0.05Ti₆Sn₅+0.06Sn. It is concluded that the stoichiometric compound CoTiSn is not synthesized but that Co_1.50TiSn with a half-filled vacancy sublattice in the MgAgAs-type structure which has the XYZ configuration is formed. Nitrogen absorption is accompanied by the disproportionation of the 'CoTiSn' sample according to the following equation: 'CoTiSn'+0.23N₂→0.50Co_1.92TiSn+0.47TiN+0.36Sn+0.04CoS n₂+0.03Co_1.50TiSn. It is revealed that nitrogen atoms react selectively with Ti atoms in the Co_1.50TiSn and Ti₆Sn₅ compounds and that nitrogen-induced occupation of the vacancy site in Co_1.50TiSn by Co atoms takes place during nitrogenation; Co_1.92TiSn with the Cu₂MnAl-type structure is formed.

本文言語	English
ページ（範囲）	86-90
ページ数	5
ジャーナル	Journal of Alloys and Compounds
巻	347
号	1-2
DOI	https://doi.org/10.1016/S0925-8388(02)00402-4
出版ステータス	Published - 2002 12月 16

ASJC Scopus subject areas

材料力学
機械工学
金属および合金
材料化学

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10.1016/S0925-8388(02)00402-4

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title = "Neutron diffraction study on the Heusler compound Co1.50TiSn and its nitrogenation products",

abstract = "Neutron powder diffraction studies have been performed for the Heusler compound 'CoTiSn' prepared from stoichiometric amounts of the constituent elements and its nitrogenation products. The Rietveld refinement indicates that the 'CoTiSn' sample consists of three phases: Co+Ti+Sn→0.69Co1.50TiSn+0.05Ti6Sn5+0.06Sn. It is concluded that the stoichiometric compound CoTiSn is not synthesized but that Co1.50TiSn with a half-filled vacancy sublattice in the MgAgAs-type structure which has the XYZ configuration is formed. Nitrogen absorption is accompanied by the disproportionation of the 'CoTiSn' sample according to the following equation: 'CoTiSn'+0.23N2→0.50Co1.92TiSn+0.47TiN+0.36Sn+0.04CoS n2+0.03Co1.50TiSn. It is revealed that nitrogen atoms react selectively with Ti atoms in the Co1.50TiSn and Ti6Sn5 compounds and that nitrogen-induced occupation of the vacancy site in Co1.50TiSn by Co atoms takes place during nitrogenation; Co1.92TiSn with the Cu2MnAl-type structure is formed.",

keywords = "CoTiSn, Disproportionation, Neutron powder diffraction, Nitrogenation, The Rietveld refinement",

author = "Tatsuhito Nobata and Go Nakamoto and Makio Kurisu and Yoshikazu Makihara and Kenji Ohoyama and Masayoshi Ohashi",

note = "Funding Information: The authors are grateful to Professor S. Ishida of Kagoshima University for illuminating discussions on the atomic configuration in Co z TiSn. This work has been carried out in part under the Visiting Researcher{\textquoteright}s Programs of the University of Tokyo. This work has been supported financially by a Grant-in-Aid for Scientific Research by Japan Society for the Promotion of Science, No. 11640344. Copyright: Copyright 2005 Elsevier B.V., All rights reserved.",

year = "2002",

month = dec,

day = "16",

doi = "10.1016/S0925-8388(02)00402-4",

language = "English",

volume = "347",

pages = "86--90",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Neutron diffraction study on the Heusler compound Co1.50TiSn and its nitrogenation products

AU - Nobata, Tatsuhito

AU - Nakamoto, Go

AU - Kurisu, Makio

AU - Makihara, Yoshikazu

AU - Ohoyama, Kenji

AU - Ohashi, Masayoshi

N1 - Funding Information: The authors are grateful to Professor S. Ishida of Kagoshima University for illuminating discussions on the atomic configuration in Co z TiSn. This work has been carried out in part under the Visiting Researcher’s Programs of the University of Tokyo. This work has been supported financially by a Grant-in-Aid for Scientific Research by Japan Society for the Promotion of Science, No. 11640344. Copyright: Copyright 2005 Elsevier B.V., All rights reserved.

PY - 2002/12/16

Y1 - 2002/12/16

N2 - Neutron powder diffraction studies have been performed for the Heusler compound 'CoTiSn' prepared from stoichiometric amounts of the constituent elements and its nitrogenation products. The Rietveld refinement indicates that the 'CoTiSn' sample consists of three phases: Co+Ti+Sn→0.69Co1.50TiSn+0.05Ti6Sn5+0.06Sn. It is concluded that the stoichiometric compound CoTiSn is not synthesized but that Co1.50TiSn with a half-filled vacancy sublattice in the MgAgAs-type structure which has the XYZ configuration is formed. Nitrogen absorption is accompanied by the disproportionation of the 'CoTiSn' sample according to the following equation: 'CoTiSn'+0.23N2→0.50Co1.92TiSn+0.47TiN+0.36Sn+0.04CoS n2+0.03Co1.50TiSn. It is revealed that nitrogen atoms react selectively with Ti atoms in the Co1.50TiSn and Ti6Sn5 compounds and that nitrogen-induced occupation of the vacancy site in Co1.50TiSn by Co atoms takes place during nitrogenation; Co1.92TiSn with the Cu2MnAl-type structure is formed.

AB - Neutron powder diffraction studies have been performed for the Heusler compound 'CoTiSn' prepared from stoichiometric amounts of the constituent elements and its nitrogenation products. The Rietveld refinement indicates that the 'CoTiSn' sample consists of three phases: Co+Ti+Sn→0.69Co1.50TiSn+0.05Ti6Sn5+0.06Sn. It is concluded that the stoichiometric compound CoTiSn is not synthesized but that Co1.50TiSn with a half-filled vacancy sublattice in the MgAgAs-type structure which has the XYZ configuration is formed. Nitrogen absorption is accompanied by the disproportionation of the 'CoTiSn' sample according to the following equation: 'CoTiSn'+0.23N2→0.50Co1.92TiSn+0.47TiN+0.36Sn+0.04CoS n2+0.03Co1.50TiSn. It is revealed that nitrogen atoms react selectively with Ti atoms in the Co1.50TiSn and Ti6Sn5 compounds and that nitrogen-induced occupation of the vacancy site in Co1.50TiSn by Co atoms takes place during nitrogenation; Co1.92TiSn with the Cu2MnAl-type structure is formed.

KW - CoTiSn

KW - Disproportionation

KW - Neutron powder diffraction

KW - Nitrogenation

KW - The Rietveld refinement

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U2 - 10.1016/S0925-8388(02)00402-4

DO - 10.1016/S0925-8388(02)00402-4

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SN - 0925-8388

VL - 347

SP - 86

EP - 90

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

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