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Invar Like Behavior of the Cr 2 AlC MAX Phase at Low Temperature
Author(s) -
Jaouen Michel,
Chartier Patrick,
Cabioc'h Thierry,
Mauchamp Vincent,
André Gilles,
Viret Michel
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12635
Subject(s) - invar , curie temperature , thermal expansion , ferromagnetism , materials science , condensed matter physics , atmospheric temperature range , phase (matter) , volume (thermodynamics) , octahedron , neutron scattering , scattering , crystallography , thermodynamics , metallurgy , chemistry , crystal structure , optics , physics , organic chemistry
The structure of Cr 2 AlC has been studied using neutron scattering experiments performed in a temperature range running from room temperature down to 1.8 K. It is shown that the unit cell volume does not vary significantly below 80 K. This anomalous behavior, correlated with the existence of a weak ferromagnetic ordering revealed from superconducting quantum interference device experiments, is similar to that characteristic of Invar alloys. Just above the Curie temperature T C ~ 73 ± 5 K, the Cr 2 AlC undergoes significant distortions of the octahedron and triangular prisms units. Above 100 K, Cr 2 AlC follows an usual thermal expansion.