TY - JOUR
T1 - Local Chemical Strain in PtFe Alloy Nanoparticles
AU - Li, Qiang
AU - Zhu, He
AU - Zheng, Lirong
AU - Liu, Hui
AU - Ren, Yang
AU - Wang, Na
AU - Chen, Jun
AU - Deng, Jinxia
AU - Xing, Xianran
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2018/9/4
Y1 - 2018/9/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85053036245&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85053036245&origin=recordpage
U2 - 10.1021/acs.inorgchem.8b01845
DO - 10.1021/acs.inorgchem.8b01845
M3 - RGC 21 - Publication in refereed journal
SN - 0020-1669
VL - 57
SP - 10494
EP - 10497
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 17
ER -