High Temperature Resistivity of Pyrolytic Graphite Bromine Residual Compounds

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概要

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• The electrical resistivity of pyrolytic graphite (PG) deposited at 2300℃ decreases in both the a- and c-axis directions as the temperature is increased up to 1000℃, but the high temperature resistivity of PG-bromine residual compounds differ somewhat from that of the original PG. When the temperature is increased, the a-axis resistivity remains nearly constant at the lower temperature range but increases rapidly between 300 and 500℃. Above 500℃ the value of the resistivity approaches that of the original PG. On cooling, the change of the electrical resistivity of PG-bromine residual compounds is the same as that on heating, but its value is larger between 500 and 100℃. At room temperature, the a-axis resistivity of the compound before and after the cyclic heat-treatment is the same. This behaviour is closely related to the c-axis thermal expansion and is well explained by the same bromine vaporisation model. As to the c-axis direction, the electrical resistivity of PG-bromine residual compounds show a different behaviour. However, the factors affecting the electrical conduction in this case are complicated and cannot be resolved.

• 東北大学の論文

著者

• Aoki Koichi

  The Research Institute For Iron Steel And Other Metals

• Yajima Seishi

  The Research Institute For Iron Steel And Other Metals

関連論文

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• Mechanism of the Pyrolytic Graphite Formation
• The Crystal Data of Ternary Rare Earth Borides, RCo_2B_2
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• Magnetocrystalline Anisotropy of Y_(Co_Fe_y)_ Intermetallic Compounds
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• The Electrical Anisotropies of Pyrolytic Graphite and Its Compounds
• Siliconated Pyrolytic Graphite : Part 2. The State of Silicon Present in Siliconated Pyrolytic Graphite
• Siliconated Pyrolytic Graphite : Part 3. Structural Features
• High Temperature Resistivity of Pyrolytic Graphite Bromine Residual Compounds
• Semiconducting Properties of Ln_2CuO_4 (Ln=Rare earths)
• Some Doping Effects on the Semiconducting Properties of Gd_2CuO_4
• The Crystal Structure and Nonstoichiometry of Rare Earth Oxyfluoride
• The Nonstoichiometry of Gadolinium Ditelluride
• The Crystal Data of Ternary Rare Earth Borides, RCo2B2
• The Crystal Structure and Nonstoichiometry of Rare Earth Oxyfluoride

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