2024-03-29T09:53:58Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/176662016-05-20T06:29:59Zcom_10261_78com_10261_3col_10261_331
2009-10-15T08:46:41Z
urn:hdl:10261/17666
Complex impedance spectroscopy study of a liquid-phase-sintered -SiC ceramic
Sánchez-González, J.
Ortiz, Ángel L.
Guiberteau, F.
Pascual, Carmen
Impedance spectroscopy
SiC
Liquid-phase sintering
Electrical properties
The electrical response of a liquid-phase-sintered (LPS) -SiC with 10 wt.% Y3Al5O12 (YAG) additives was studied from near-ambient temperature
up to 800 ◦C by complex impedance spectroscopy. The electrical conductivity of this LPS SiC ceramic was found to increase with increasing
temperature, which was attributed to the semiconductor nature of the SiC grains. It was concluded that the contribution of the SiC grains to the
electrical conductivity of the LPS SiC ceramic at moderate temperatures (<450 ◦C) is a somewhat greater than that of the YAG phase. In contrast, at
higher temperatures the SiC grains control the electrical conductivity of the LPS SiC ceramic. It was also found that there are two activation energies
for the electrical conduction process of the -SiC grains. These are 0.19 eV at temperatures lower than ∼400 ◦C and 2.96 eV at temperatures higher
than ∼500 ◦C. The existence of two temperature-dependence conduction regimes reflects the core–shell substructure that develops within the SiC
grains during the liquid-phase sintering, where the core is pure SiC (intrinsic semiconductor) and the shell is mainly Al-doped SiC (extrinsic
semiconductor).
2009-10-15T08:46:41Z
2009-10-15T08:46:41Z
2007
artículo
Journal of the European Ceramic Society 27 (2007) 3935–3939
http://hdl.handle.net/10261/17666
10.1016/j.jeurceramsoc.2007.02.066
eng
doi:10.1016/j.jeurceramsoc.2007.02.066
closedAccess
Elsevier