Crystal structure of Cu-Sn-In alloys around the �� phase field studied by neutron diffraction
| Autor: | Aurelio, Gabriela, Sommadossi, Silvana A, Cuello, Gabriel J |
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| Rok vydání: | 2012 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1204.2154 |
| Popis: | The study of the Cu-Sn-In ternary system has become of great importance in recent years, due to new environmental regulations forcing to eliminate the use of Pb in bonding technologies for electronic devices. A key relevant issue concerns the intermetallic phases which grow in the bonding zone and are determining in their quality and performance. In this work, we focus in the ��-phase (Cu2In or Cu6Sn5) that exists in both end binaries and as a ternary phase. We present a neutron diffraction study of the constitution and crystallography of a series of alloys around the 60 at.% Cu composition, and with In contents ranging from 0 to 25 at.%, quenched from 300\degreeC. The alloys were characterized by scanning electron microscopy, probe microanalysis and high-resolution neutron diffraction. The Rietveld refinement of neutron diffraction data allowed to improve the currently available model for site occupancies in the hexagonal ��-phase in the binary Cu-Sn as well as in ternary alloys. For the first time, structural data is reported in the ternary Cu-Sn-In ��-phase as a function of composition, information that is of fundamental technological importance as well as valuable input data for ongoing modelisations of the ternary phase diagram. 8 pages, 10 figures |
| Databáze: | OpenAIRE |
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