Local Chemical Strain in PtFe Alloy Nanoparticles

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Qiang Li
  • He Zhu
  • Lirong Zheng
  • Hui Liu
  • Na Wang
  • Jun Chen
  • Jinxia Deng
  • Xianran Xing

Detail(s)

Original languageEnglish
Pages (from-to)10494-10497
Journal / PublicationInorganic Chemistry
Volume57
Issue number17
Publication statusPublished - 4 Sept 2018
Externally publishedYes

Abstract

Precise deciphering of the atomic-insight chemical strain and distribution in nanosolids, especially in nanoalloys with disordered structure, is significant to correlate the structure and chemical properties. In this report, we found an abnormally enhanced negative thermal expansion (NTE) along the c axis in a 3.5 nm PtFe magnetic L10 alloy, which was usually weakened by the reduced contribution of invar behavior in a nanosized magnetic material. 57Fe Mössbauer spectra and extended X-ray absorption fine structure studies indicated the local disordered state of chemical coordination of the L10 phase. Pair distribution function and reverse Monte Carlo simulation revealed a surface A1-phase coating and atomic-level stretching chemical strain on the heteroatomic pair along the c axis. Local tensile chemical strain and increasing magnetic moments of Fe atoms on the surface of the L10 core made a dominant contribution to the enhanced NTE behavior. The present work brings an atomic reveal for the local chemical strain in bimetallic nanomaterials and provides an innovative perspective to tailoring the functional properties according to the local chemical environment.

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Citation Format(s)

Local Chemical Strain in PtFe Alloy Nanoparticles. / Li, Qiang; Zhu, He; Zheng, Lirong et al.
In: Inorganic Chemistry, Vol. 57, No. 17, 04.09.2018, p. 10494-10497.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review