Open AccessNegative thermal expansion of the Ho2AlFe14Mn2 compound
Author(s) -
Hao Yan-Ming,
Cui Chun-Xing,
Meng Fan-Bin
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.999
Subject(s) - thermal expansion , negative thermal expansion , magnetostriction , materials science , diffraction , condensed matter physics , thermal , hexagonal crystal system , volume (thermodynamics) , crystallography , nuclear magnetic resonance , thermodynamics , composite material , chemistry , optics , magnetic field , physics , quantum mechanics
The structure properties of Ho2AlFe16-xMnx compounds have been investigated by means of x-ray diffraction and magnetic measurements. The Ho2AlFe16-xMnx compounds have a hexagonal Th2Ni17-type structure. Their unit-cell volumes increase nonlinear with increasing x. This implies there is a positive spontaneous volume magnetostriction in the magnetic state of these compounds. x-ray diffraction of the Ho2AlFe14Mn2 compound from 160 to 285 K shows that there appears a negative coefficient of thermal expansion from 220 to 270K and the average thermal expansion is -14×10-4·K-1.