Formulation of Ag-Sn intermetallic compound

A method for synthesising an Ag-Sn intermetallic compound comprising the following sequence of steps: a step of providing a mixture (E1) during which a solution of a mixture of a silver salt and a protective agent in a polyol solvent is produced, a first heating step (E2) during which the solution is heated to a temperature T1 greater than or equal to 140 degrees centigrade and less than or equalto 180 degrees centigrade for a time t1 greater than or equal to 5 minutes and less than or equal to 1 hour, a step of introducing a tin salt (E3) during which a tin salt and sodium hydroxide are introduced into the solution, a second heating step (E4) during which the solution is heated to a temperature T2 greater than or equal to 140 degrees centigrade and less than or equal to 180 degrees centigrade for a time t2 greater than or equal to 5 minutes and less than or equal to 1 hour, a reduction step (E5) during which a reducing agent is introduced into the solution, a third heating step (E6)during which the solution