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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.57  No.7 (2016)  >  pp.1059-1065

MATERIALS TRANSACTIONS
<<Previous article Vol.57  No.7 (2016)   pp.1059 - 1065 Next article>>

Thermoelectric Properties of Cr1-xWxSi2

Afiqa Mohamad1), Yuji Ohishi1), Yoshinobu Miyazaki1) 2), Hiroaki Muta1), Ken Kurosaki1), Shinsuke Yamanaka1) 3)
1) Graduate School of Engineering, Osaka University 2) Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology 3) Research Institute of Nuclear Engineering, University of Fukui

The thermoelectric properties of W-substituted CrSi2 were studied. Polycrystalline samples of hexagonal C40-structured Cr1-xWxSi2 (x = 0.05, 0.10) were synthesized by arc melting and spark plasma sintering followed by heat treatment. Compared to non-substituted CrSi2, the lattice thermal conductivity was reduced from 9.0 to 4.6 W m−1 K−1 by W substitution because of enhanced phonon–impurity scattering. However, the power factor was slightly reduced by W substitution, as with Mo substitution. The thermoelectric figure of merit, zT, increased with increasing W content because of the reduced thermal conductivity, reaching 0.19 at 670 K. We analyzed the observed electrical properties using a theoretical model based on the Boltzmann transport equation. The effective mass of CrSi2 increases from 2.5 to ~3.5 by W or Mo substitution, indicating that W or Mo substitution affects the band structure of CrSi2, which reduces the power factor.


Keyword:
chromium silicide, tungsten substitution, thermal conductivity, thermoelectric properties, effective mass

Received: January 06, 2016
Accepted: March 11, 2016 , Published online: June 25, 2016

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