Controllable isotropic thermal expansion in series of designed magnetocaloric materials HoCo₂Mn_x (x = 0–1.0)

Authors

Chun Sheng Fang, University of Wollongong
Jian Li Wang, University of Wollongong
Wayne D. Hutchison, University of New South Wales at Australian Defence Force Academy
W. Q. Wang, Jilin University
A. J. Studer, Australian Nuclear Science and Technology Organisation
Q. F. Gu, Australian Synchrotron
Jinkui Zhao, Songshan Lake Materials Laboratory

Publication Name

Journal of Alloys and Compounds

Abstract

We detected a crossover from negative to positive thermal expansion with increasing Mn in HoCo Mn below the Curie temperature through high quality neutron diffraction measurements from 5 K to 400 K. Almost isotropic zero thermal expansion with coefficient of thermal expansion α = −4.894 × 10 /K was achieved over a large range of temperature from 5 K to T = 225 K in the compound HoCo Mn . While the addition of manganese was shown to change the temperature dependence of the lattice, it was also noted that the Curie temperature rose significantly from 88 K in HoCo to 253 K in HoCo Mn providing a hope for a room temperature transition in similar doping series materials. 2 x l C 2 0.5 2 2 −7

Open Access Status

This publication is not available as open access

Volume

863

Article Number

158063

Funding Number

2019A1515110500

Funding Sponsor

Australian Research Council