acetic acid; ammonia in acetic acid neutralizing soln. of yttrium nitrate in acetic acid with ammonia (CH3COOH/Y=2, NH4OH/Y=4); mixt. deposition onto glass substrate; crystals removal after about 15 d, quick washing (water); elem. anal.;

in acetic acid boiling nitrate in 50percent HAc; recrystn. (H2O); elem. anal.;