Electrical, magnetic, and Hall properties of Al sub(x)CoCrFeNi high-entropy alloys

This investigation explores the electrical and magnetic properties of as-cast, -homogenized, and -deformed Al sub(x)CoCrFeNi (C-x, H-x, and D-x, respectively) alloys at various temperatures from 4.2 to 300 K. Experimental results reveal that carrier density of the alloys is of 10 super(22-23) cm sup...

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Bibliographic Details
Published in:Journal of alloys and compounds 2011-02, Vol.509 (5), p.1607-1614
Main Authors: Kao, Yih-Farn, Chen, Swe-Kai, Chen, Ting-Jie, Chu, Po-Chou, Yeh, Jien-Wei, Lin, Su-Jien
Format: Article
Language:English
Subjects:
Alloys
Carrier density
Carriers
Coefficients
Electrical resistivity
Ferromagnetism
Magnetic properties
Spin glass
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Summary:This investigation explores the electrical and magnetic properties of as-cast, -homogenized, and -deformed Al sub(x)CoCrFeNi (C-x, H-x, and D-x, respectively) alloys at various temperatures from 4.2 to 300 K. Experimental results reveal that carrier density of the alloys is of 10 super(22-23) cm super(-3). H-x has a carrier mobility of 0.40-2.61 cm super(2) V super(-1) s super(-1). The residual electrical resistivity of the alloys varies from 100 to 220 mu [Omega] cm. The temperature coefficient of resistivity (TCR) of H-2.00 is small (82.5 ppm/K). Therefore, defects in the lattice dominate electrical transportation. Some compositions exhibit Kondo-like behavior. At 300 K, H-0.50, H-1.25, and H-2.00 are ferromagnetic, while H-0.00, H-0.25, and H-0.75 are paramagnetic. Al and AlNi-rich phases reduce the ferromagnetism of single FCC and single BCC H-x, respectively. Spin glass behavior of some compositions is also observed. Alloys H-x are of the hole-like carrier type, and ferromagnetic H-x exhibits an anomalous Hall effect (AHE).
ISSN:0925-8388
DOI:10.1016/j.jallcom.2010.10.210