“…Literature data for homogeneous Co1_(jO crystals may be found for deviation from stoichiometry [1][2][3][4][5][6][7][8][9][10][11][12], electrical conductivity [3,4,6,9,11,[13][14][15][16][17][18], cation tracer diffusion [1,[18][19][20][21][22][23][24][25] and anion tracer diffusion [26][27][28]. The stability range is well established from the oxygen activities for the Co/Co1_äO equilibrium [3,4,[29][30][31][32][33][34][35][36] and the Coi_âO/ C03O4 equilibrium [29,34,[36][37]…”