Low temperature transport properties of pyrolytic graphite sheet

Sachiko Nakamura, Daisuke Miyafuji, Takenori Fujii, Tomohiro Matsui, Hiroshi Fukuyama

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We have made thermal and electrical transport measurements of uncompressed pyrolytic graphite sheet (uPGS), a mass-produced thin graphite sheet with various thicknesses between 10 and 100 μm, at temperatures between 2 and 300 K. Compared to exfoliated graphite sheets like Grafoil, uPGS has much higher conductivities by an order of magnitude because of its high crystallinity confirmed by X-ray diffraction and Raman spectroscopy. This material is advantageous as a thermal link of light weight in a wide temperature range particularly above 60 K where the thermal conductivity is much higher than common thermal conductors such as copper and aluminum alloys. We also found a general relationship between thermal and electrical conductivities in graphite-based materials which have highly anisotropic conductivities. This would be useful to estimate thermal conductance of a cryogenic part made of these materials from its electrical conductance more easily measurable at low temperature.

Original languageEnglish
Pages (from-to)118-122
Number of pages5
JournalCryogenics
Volume86
DOIs
Publication statusPublished - Sept 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Physics and Astronomy

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