Synthesis of Sn − Ag and Sn – Ag – Cu eutectic alloys by electroless deposition from pyrophosphate solutions

Authors

  • Anna M. Rabenok Belarusian State University, 4 Niezaliezhnasci Avenue, Minsk 220030, Belarus
  • Dmitrii V. Sviridov Belarusian State University, 4 Niezaliezhnasci Avenue, Minsk 220030, Belarus
  • Olga N. Vrublevskaya Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieningradskaja Street, Minsk 220006, Belarus

Keywords:

contact displacement, alloy, tin, silver, copper, eutectic, pyrophosphate electrolyte, phase composition, side processes
Supporting Agencies
The research was supported by the Ministry of Education of the Republic of Belarus (assignment 2.1.06.02 of the state programme of scientific research «Chemical processes, reagents and technologies, bioregulators and bioorgchemistry», state registration No. 20210190).

Abstract

To obtain low-melting alloys (in wt. %) Sn94.7Ag5.3 and Sn94.0Ag4.8Cu1.2 used as solders for microassembly of electronic devices, simple method of electroless deposition from pyrophosphate solutions has been developed. The method is based on the reduction of Ag(I) and Сu(II) ions with tin powder as a reducing agent. Sn94.7Ag5.3 and Sn94.0Ag4.8Cu1.2 alloys include crystalline phases of β-Sn, Ag3Sn and β-Sn, Ag3Sn, Cu6Sn5 respectively, which corresponds to the phase composition of the eutectics. It has been revealed that binary and ternary alloys begin to melt at a temperature of 200 °C, but the melting occurs in two stages. This is due to the structure of particles with tin core and Sn – Ag or Sn – Ag – Cu alloy shell. It has been found that copper co-deposited into the alloy participates in the contact displacement of Ag(I) ions.

Author Biographies

  • Anna M. Rabenok, Belarusian State University, 4 Niezaliezhnasci Avenue, Minsk 220030, Belarus

    student at the faculty of chemistry

  • Dmitrii V. Sviridov, Belarusian State University, 4 Niezaliezhnasci Avenue, Minsk 220030, Belarus

    doctor of science (chemistry), corresponding member of the National Academy of Sciences of Belarus, full professor; head of the department of inorganic chemistry, faculty of chemistry

  • Olga N. Vrublevskaya, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieningradskaja Street, Minsk 220006, Belarus

    PhD (chemistry), docent; deputy director for research work

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Published

2023-09-20

Issue

No. 2 (2023): Journal of the Belarusian State University. Chemistry

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Original Articles

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How to Cite

[1]
Rabenok, A.M. et al. 2023. Synthesis of Sn − Ag and Sn – Ag – Cu eutectic alloys by electroless deposition from pyrophosphate solutions. Journal of the Belarusian State University. Chemistry. 2 (Sep. 2023), 13–21.