Joining silver sheet, method for manufacturing same, and method for joining electronic part

A method for manufacturing a joining silver sheet, comprising:

• a step of coating, on a substrate, a silver paste containing silver powder containing silver particles having a particle diameter of from 1 to 250 nm, and a dispersion medium having a 25% volatilization temperature T25 (° C.) defined by the following item (A) in a temperature range of 200° C. or lower, which are mixed with each other;
• a step of subjecting a coated film thus coated, to a heat treatment at a temperature range that is T25 (° C.) or higher and causes no sintering of the silver particles, thereby performing volatilization of the dispersion medium;
• and
• a step of baking the coated film thus subjected to the heat treatment, at a temperature of from 170 to 250° C. under application of a pressure of from 5 to 35 MPa, thereby providing a silver sheet containing the silver particles integrated by sintering,
• (A) on subjecting the silver paste to thermogravimetric analysis (TG) by heating from ambient temperature at 10° C. per minute in the air, a temperature, at which the dispersion medium shows a weight reduction ratio according to the following expression (2) of 25% is designated as the 25% volatilization temperature T25 (° C.):
• (weight reduction ratio of dispersion medium (%))=((cumulative mass of dispersion medium having been volatilized by heating in thermogravimetric analysis (g))/(total mass of dispersion medium present in silver paste specimen before subjecting to thermogravimetric analysis (g)))×100 (2)