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Effects of Ni and Cu antisite substitution on the phase stability of CuGa2 from liquid Ga/Cu-Ni interfacial reaction.

08:00 EDT 14th August 2019 | BioPortfolio

Summary of "Effects of Ni and Cu antisite substitution on the phase stability of CuGa2 from liquid Ga/Cu-Ni interfacial reaction."

Ga and Ga-based alloys have received significant attention due to their potential applications as liquid metals and also for the bonding of materials in microelectronics near room temperature. This study investigates the phase stability of CuGa2 phase as a product of the interfacial reaction between liquid Ga and Cu-10Ni substrates at room temperature. In the binary Ga-Cu system CuGa2 is decomposed into liquid Ga and Cu9Ga4 as the temperature increases to around 260 °C, which prevents the widespread application of this alloy. In contrast to CuGa2 grown from a pure Cu substrate, that from the Cu-10Ni substrate shows an increase in the decomposition temperature during heating from 25 °C to 300 °C) According to our first-principle calculations, there is only a minor difference in the total free energy between Ni solute at the Cu sublattice and the Ga sublattice in the tetragonal CuGa2 crystal structure. This result indicates that both of the sublattices can accommodate the dilute Ni solute with comparable probability. Regardless of the sublattice where the Ni impurities are located, the presence of diluted Ni in the matrix stabilises the CuGa2 system by inducing some localized Ni-3d states at energy levels near the Fermi level. It is also shown the formation of Cu antisite defects, which also stabilise CuGa2, is preferable if the CuGa2 matrix is grown on a Ni-containing substrate.

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This article was published in the following journal.

Name: ACS applied materials & interfaces
ISSN: 1944-8252
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