Electronic structure of nanosized bcc Cu precipitates in Fe-Cu alloys studied by positron 2D-ACAR

Toshinobu Chiba, Yasuyoshi Nagai, Zheng Tang, Takashi Akahane, Masayuki Hasegawa, Minoru Takenaka, Eiichi Kuramoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Based on the finding with the use of the coincidence Doppler measurements that the nanosized Cu precipitates are coherently embedded in the Fe-Cu matrix alloy, taking a bcc structure and acting as efficient positron traps, we measured 2D-ACARs of carefully grown and heat treated single crystals of Fe-Cu. We found that the precipitates have a Fermi surface with 12 necks touching the {110} Bragg planes of the bcc Brillouin zone, which contrasts distinctly with that of the bulk Cu with 8 necks touching the {111} Bragg planes of the fee Brillouin zone. The 3 dimensional momentum reconstruction of the 2D ACAR data showed that the Fermi surface cutoff of the Cu precipitates is blurred considerably as compared with that of bulk fee Cu, suggesting a marked size effect in the momentum distribution.

Original languageEnglish
Title of host publicationPositron Annihilation
Subtitle of host publicationProceedings of the 13th International Conference on Positron Annihilation, ICPA-13
EditorsToshio Hyodo, Haruo Saito, Yoshinori Kobayashi, Yasuyuki Nagashima
PublisherTrans Tech Publications Ltd
Pages380-384
Number of pages5
ISBN (Print)9780878499366
DOIs
Publication statusPublished - 2004
EventPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13 - Kyoto, Japan
Duration: 2003 Sep 72003 Sep 12

Publication series

NameMaterials Science Forum
Volume445-446
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

OtherPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13
CountryJapan
CityKyoto
Period03/9/703/9/12

Keywords

  • 2D-ACAR
  • Bcc Cu
  • Electronic Structure
  • Fermi Surface
  • Fine Particles
  • Nano-Precipitates
  • Positron Annihilation
  • Size Effect

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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