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The electric conduction and low-frequency noise were investigated in silicon nitride-based ceramics doped with different
carbon allotropes as multi-wall carbon nanotubes, black carbon and graphite powder. The electric conduction was found
unstable in time. This instability does not depend on the atmosphere and on the possible variation of the temperature. The
noise spectra show 1/f character, however the magnitude of the noise differ for the different dopants, and strongly
depends on the pressure of sintering. The comparison of the resistance values and the noise magnitudes suggest that the
carbon dopants form percolation networks. The carbon is distributed most likely at the surface of the ceramic particles
like the Swiss-Cheese model.
Béla Szentpáli andPéter Arató
"Electronic noise in silicon nitride ceramics doped by carbon
allotropes", Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 660021 (11 June 2007); https://doi.org/10.1117/12.724551
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Béla Szentpáli, Péter Arató, "Electronic noise in silicon nitride ceramics doped by carbon allotropes," Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 660021 (11 June 2007); https://doi.org/10.1117/12.724551