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High Pressure Carbon Behavior Induced from Carbide Hugoniots

Published online by Cambridge University Press:  10 February 2011

T. Sekine ,
E. Takazawa  and
T. Kobayashi
T. Sekine
Affiliation:
National Institute for Research in Inorganic Materials, 1–1 Namiki, Tsukuba 305, JAPAN, sekine@nirim.go.jp
E. Takazawa
Affiliation:
National Institute for Research in Inorganic Materials, 1–1 Namiki, Tsukuba 305, JAPAN, sekine@nirim.go.jp
T. Kobayashi
Affiliation:
National Institute for Research in Inorganic Materials, 1–1 Namiki, Tsukuba 305, JAPAN, sekine@nirim.go.jp
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Abstract

Investigations of Hugoniots the diamond-type carbides(various SiC) and NaCl-type carbides such as TiC give some insights into the high-pressure carbon behaviors. The experimental results of phase transitions of a-SiC and β-SiC, together with those of diamond-structure Si, imply that the candidate as post-diamond phase has sixfold coordination and that a possible transition pressure is about 1–2 TPa. The NaCl-type carbide Hugoniots indicate that sixfold coordinated C is very stable at high pressures. The partial molar volume of carbon in the NaCl-type carbides ranges between 1.4 to 2.6 cnvVg-atom C at 1 atm and reaches about 2.8 cm3/g-atom C at 100 GPa. Taking into account structural variations of the corresponding metals, the volume of the sixfold coordinated C is estimated to be 1.7 cm3/g-atom C, about half of that of diamond, and the post-diamond phase appears to be extremely hard.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 99
Copyright
Copyright © Materials Research Society 1998

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