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Fabrication of β-boron by chemical-reaction and melt-quenching methods at high pressures

Published online by Cambridge University Press:  03 March 2011

V.V. Brazhkin ,
T. Taniguichi ,
M. Akaishi  and
S.V. Popova
V.V. Brazhkin
Affiliation:
Institute for High Pressure Physics, Troitsk, Moscow 142190, Russia
T. Taniguichi*
Affiliation:
National Institute for Materials Sciences, Tsukuba, Ibaraki 305-0044, Japan
M. Akaishi
Affiliation:
National Institute for Materials Sciences, Tsukuba, Ibaraki 305-0044, Japan
S.V. Popova
Affiliation:
Institute for High Pressure Physics, Troitsk, Moscow 142190, Russia
*
a) Address all correspondence to this author. e-mail: TANIGUCHI.takashi@nims.go.jp
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Abstract

The dependence of boron crystallization upon melt cooling has been investigated, as well as boron formation as a result of the chemical reaction of boron oxide with magnesium at a pressure of 7.7 GPa. Crystallization from the melt and the chemical reaction produce a rhombohedral β-boron phase, which is evidence of this phase stability at all temperatures up to the melting curve within the pressure range up to7.7 GPa. The melting temperature Tm at 7.7 GPa is 2480 ± 50 K, which points to a slight positive slope of the melting curve equal to approximately 10 K/GPa. Well-shaped single crystals of boron are formed as a result of the chemical reaction and the subsequent cooling from the melt at a rate of approximately 1 K/s, indicating low viscosity of the liquid phase.

Keywords

Chemical reactionCrystal growth
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 6 , June 2004 , pp. 1643 - 1648
Copyright
Copyright © Materials Research Society 2004

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