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Home  >  Journal list  >  Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue  >  Vol.112  9. Electronic and Ionic Conductors  >  pp.S676-S680

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
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Thermoelectric Properties and Electronic Density of States of Transition Metal Monoborides, FeB, CoB, NiB and their Solid Solutions

Shin NISHIYAMA1), Hiroaki NAKAMURA1) and Takeo HATTORI1)
1) Department of Materials Technology, Faculty of Engineering, Chiba University

  Monoborides of iron, cobalt and nickel, and their solid solutions having FeB crystal structures, were prepared by solid state reaction at 950°C in a vacuum and were then HIPed using hydrothermal water as a fluid at 900°C for 2 h at 100 MPa. Electrical conductivity and Seebeck coefficients of the specimens were measured in order to evaluate thermoelectric properties. Electrical conductivities were greater than 105 Sm-1 and Seebeck coefficients range from +20 to -30 μVK-1 as metal atoms changed. The electrical densities of states of these borides were calculated by a first principle method (DV-Xα). The Fermi level of these borides was near the 3d orbital of the metal atom and this seemed to be a reason for the relatively high Seebeck coefficients.


Keyword:
Metal boride, Hydrothermal HIP, Electrical conductivity, Thermoelectricity, Density of states calculation

Received: August 05, 2003
Accepted: December 18, 2003 , Published online: September 29, 2004
Copyright (c) 2004 The Ceramic Society of Japan

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