Electrical and thermal conductivity of graphite-metal composites

• Date: 2004
• Main Authors: Stelmakh, O.I., Vovchenko, L.L., Matzui, V.I.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2004
• Series: Functional Materials
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/139470
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Electrical and thermal conductivity of graphite-metal composites / O.I. Stelmakh, L.L. Vovchenko, V.I. Matzui // Functional Materials. — 2004. — Т. 11, № 3. — С. 546-550. — Бібліогр.: 9 назв. — англ.

Electrical and thermal conductivity of graphite-Co(Ni) composites on the basis of two different types of thermoexfoliated graphite, TEG(1) and TEG(2) have been studied. The distinctions in electric resistivity (pD) between compacted TEG(1) and TEG(2) can be explained by a better compressibility of TEG(2) powders resulting in lowered contact resistance Rk between the TEG(2) particles. Co or Ni deposition onto TEG surface (up to metal content of 30 to 50 % mass.) has been found to result in an increased electric resistivity of compacted TEG-metal samples and weakened temperature dependence p(7). These p changes are associated likely to increased Rk between TEG particles due to introduced metal. The fixation of metal (Co, Ni) particles on the TEG(2) surface does not influence essentially the thermal conductivity ( λc) of compacted TEG(2)-Co(Ni) samples. In TEG(2) and TEG(2)-Co(Ni) samples, thermal conductivity exhibits a complex temperature dependence: λc increases slowly under heating in 300 to 700 K temperature range while a sharp λс rise is observed under cooling from 250 to 150 K.