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Bi–In system

D.S. Evans, A. Prince

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Abstract

The Bi–In system has been redetermined mainly using thermal analysis, but supplemented as appropriate by metallographic and X-ray examination. It is confirmed that the system contains four compounds: BiIn, Bi3In5, BiIn2, and an ɛ phase at approximately 90 at.-%In. Bi and BiIn form a eutectic at 46·8 at.-%In and 109·7°C. The compound Bi3In5 is generated in a peritectic reaction at 88·9°C and forms a eutectic with BiIn2 at approximately 64·6 at.-%In and 88·7°C. The ɛ phase is also generated in a peritectic reaction, at a temperature of 93·5°C, and forms a eutectic with BiIn2 at 78·5 at.-%In and 72·7°C. The probable accuracy of the results is ±0·5 at.-%In and ±0·5 K. The ɛ phase decomposes eutectoidally at 49 ± 1°C. Equations representing the main liquidus boundaries and the α-In solidus boundary are given.

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What this paper is about

The Bi–In system has been redetermined mainly using thermal analysis, but supplemented as appropriate by metallographic and X-ray examination. It is confirmed that the system contains four compounds: BiIn, Bi3In5, BiIn2, and an ɛ phase at approximately 90 at.-%In. Bi and BiIn form a eutectic at 46·8 at.-%In and 109·7°C. The compound Bi3In5 is generated in a peritectic reaction at 88·9°C and forms a eutectic with BiIn2 at approximately 64·6 at.-%In and 88·7°C. The ɛ phase is also generated in a peritectic reaction, at a temperature of 93·5°C, and forms a eutectic with BiIn2 at 78·5 at.-%In and 72·7°C. The probable accuracy of the results is ±0·5 at.-%In and ±0·5 K. The ɛ phase decomposes eutectoidally at 49 ± 1°C. Equations representing the main liquidus boundaries and the α-In solidus boundary are given.

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Available abstract

The Bi–In system has been redetermined mainly using thermal analysis, but supplemented as appropriate by metallographic and X-ray examination. It is confirmed that the system contains four compounds: BiIn, Bi3In5, BiIn2, and an ɛ phase at approximately 90 at.-%In. Bi and BiIn form a eutectic at 46·8 at.-%In and 109·7°C. The compound Bi3In5 is generated in a peritectic reaction at 88·9°C and forms a eutectic with BiIn2 at approximately 64·6 at.-%In and 88·7°C. The ɛ phase is also generated in a peritectic reaction, at a temperature of 93·5°C, and forms a eutectic with BiIn2 at 78·5 at.-%In and 72·7°C. The probable accuracy of the results is ±0·5 at.-%In and ±0·5 K. The ɛ phase decomposes eutectoidally at 49 ± 1°C. Equations representing the main liquidus boundaries and the α-In solidus boundary are given.

Key concepts: Eutectic system, Liquidus, Solidus, Materials science, Phase (matter), Phase boundary, Phase diagram, Thermodynamics

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