Oxygen adsorption properties of YBaCo4O7-type compounds

Synthesis, thermal stability, and oxygen intake/release characteristics of YBa(Co1−xAlx)4O7+δ

“…The Y-114 phase is indeed known to accept various kinds of cation substitutions, e.g. Ca and smaller rare earth elements (Dy, Ho, Er, Tm, Yb, and Lu) for Y [9][10][11][12][13][14][15], and Fe, Zn, Al, and Ga for Co [8,9,[16][17][18][19][20]. Among these substitutions, aluminum was suggested to be highly effective to suppress the thermal instability [16,21].…”

Mössbauer spectroscopy analysis of 57Fe-doped YBaCo4O7+δ: Effects of oxygen intercalation

“…Oxide materials derived from recently discovered RBaCo 4 O 7 (RQHo, Y) phases [1,2] attract growing interest due to their unusual oxygen-sorption and transport properties, complex structural relationships and frustrated magnetism [2][3][4][5][6][7][8][9][10][11][12][13]. The crystal structure of these compounds is built of closely packed alternating triangular and Kagomé layers of corner-sharing Co1O 4 and Co2O 4 tetrahedra, respectively (Fig.…”

Crystal chemistry and properties of mixed ionic-electronic conductors

“…Recently, RBaCo 4 O 7+δ (R = Y, Ca, In, Lu, Yb, Tm, Er, Ho, and Dy) oxides with a hexagonal structure have attracted interest as potential oxygen storage materials since they absorb/desorb a large amount of oxygen (0≤δ≤1.5) into/ from the lattice at low temperatures of 200-400°C in addition to exhibiting interesting magnetic properties [74][75][76][77][78][79][80][81][82]. The RBaCo 4 O 7 oxides consist of corner-shared CoO 4 tetrahedra with the Ba 2+ and R n+ ions adopting, respectively, 12-and 6-fold oxygen coordinations as seen in Fig.…”