The An+2BnB′O3n+3 Family (B=B′=Co): Ordered Intergrowth between 2H–BaCoO3 and Ca3Co2O6 Structures

Structure and magnetic properties of the orthorhombic n=2 Ruddlesden–Popper phases Sr3Co2O5+δ (δ=0.91, 0.64 and 0.38)

“…The Ag 2 O content of the tube was limited to provide a maximal 1.5 mole oxygen per formula unit. Heating in a richer oxygen ambient at higher temperatures resulted in the formation of Sr 5 Co 4 O 12 [23]. As recently reported by Pelloquin et al [24], Sr 3 Co 2 O 6.06 is highly sensitive to atmospheric moisture and becomes an oxyhydrate.…”

Electrical resistivity and Seebeck coefficient of Sr6Co5O15

“…When Sr 6 Co 5 O 15 was sintered by the SPS method, the obtained sample included a compound, which was different from the compound obtained in the lower temperature region mentioned above, in addition to Sr 6 From the results, Sr 6 Co 5 O 15 tends to change to other compounds depending on the heating conditions. In addition, the thermogravimetric analysis for Sr 6 Co 5 O 15 , carried out in air, showed the weight loss of 1.5% in the temperature range of 673-1123 K, suggesting the formation of oxygen defects.…”

“…(A 3 Co 2 O 6 ) m (A 3 Co 3 O 9 ) n (A, A = Ca, Sr, Ba) are the homologous series which have the Ca 3 Co 2 O 6 type structure (m = 1, n = 0) [1] and 2H-BaCoO 3 (perovskite) type structure (m = 0, n = 1) [2] as the end members, and several compounds have been reported so far [3][4][5][6][7][8][9][10]. (A 3 Co 2 O 6 ) m (A 3 Co 3 O 9 ) n have the pseudo-onedimensional structure consisting of Co-O chains in which CoO 6 octahedra and CoO 6 triangular prisms are connected sharing their faces in the direction of c-axis and alkaline earth atoms isolating the Co-O chains.…”

“…The effect of the spark plasma sintering (SPS) method, which encourage the grain growth, on the electrical properties of Sr 6 Co 5 O 15 and Ca 3 Co 2 O 6 was also investigated. In this paper, Sr 6 The X-ray powder diffraction (XRD) patterns were recorded by a diffractometer (Rigaku RINT2000) using Cu K␣ radiation with a pyrolytic graphite monochromator. Electrical resistivity was measured by the direct current four-probe method in the temperature range of 300-1120 K in air.…”

Magnetic properties of one-dimensional compounds (, Sr, Ba; )

“…Ca 3 Co 2 O 6 corresponds to the end member of a homologous series A nþ2 Co nþ1 O 3nþ3 with A ¼ Ca and n ¼ 1 [7]. A short-range magnetic order was also found for the n ¼ 225 and 1 compounds by the m þ SR techniques, and the onset temperature decreased systematically with increasing n, most likely because the inter-chain distance increased [3][4][5].…”