“…The second phase, Mn 0.6 Ta 0.4 O 1.65 , has a cubic fluorite average structure with the space group Fm3m, a = 4.9826(3) A Ê , and a total vacancy concentration of 17.5% on the oxygen atom sites. It exhibits considerable diffuse scattering, which has been thoroughly investigated and described in a previous paper [1].…”