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Phase diagram study of the Si–P system in Si-rich region

Published online by Cambridge University Press:  07 June 2011

Jafar Safarian  and
Merete Tangstad
Jafar Safarian*
Affiliation:
Norwegian University of Science and Technology, 7491 Trondheim, Norway
Merete Tangstad*
Affiliation:
Norwegian University of Science and Technology, 7491 Trondheim, Norway
*
a)Address all correspondence to these authors. e-mail: Jafar.Safarian@material.ntnu.no
b)e-mail: Merete.Tangstad@material.ntnu.no
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Abstract

The Si–P system at high temperatures up to 6 wt%P was investigated. Silicon–phosphorus alloys were prepared through the melting of silicon–phosphorus mixtures in closed silica tubes. Microstructural studies indicated two phases in the alloys, i.e., a solid solution of P in Si and the intermediate compound SiP. Thermal analysis technique was applied to study the phase transformations in the alloys at elevated temperatures. It was observed that SiP is melted at 1139 ± 2 °C. A eutectic reaction in the system, in which liquid Si–P alloy is transformed to SiP and a solid solution of P in Si was observed at 1129 ± 2 °C. Moreover, the liquidus and solidus on the silicon-rich part of the phase diagram were determined as:

Solidus: TS = −75.03 CP + 1414 (°C) 0.35 < CP < 1 wt%P

Liquidus: TL = −6.74 CP + 1414 (°C) CP < 6 wt%P

The distribution coefficient of P in Si was calculated as k0 = 0.09 using the obtained solidus and liquidus at low concentrations.

Keywords

SiPPhase equilibria
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 12 , 28 June 2011 , pp. 1494 - 1503
Copyright
Copyright © Materials Research Society 2011

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