hi all,

i use Cu particles in size of 1 micrometer to make a film.

i sinter the film at 600 in air and then reduce the oxidised Cu to metal state at 300 in pure h2 or H2/Ar atmosphere.

i noticed that the particles collapse after this process and the film becomes very unstable. i don't understand why spherical Cu particles lose their shape and become much smaller after this. film is mostly unstable after reduction.

any comment or method to avoid this is appreciated.

thanks