Cation Deficiency in (Ba, Sr)Co1−xOyHexagonal Perovskite Related Oxides: New Members of theAn+2B′BnO3n+3Homologous Series

Appearance of a two-dimensional antiferromagnetic order in quasi-one-dimensional cobalt oxides

“…Recently, a homologous series of A n+2 B ′ B n O 3n+3 (A= Ca, Sr, Ba, B ′ and B=Co) was discovered, in which charge carrier transport is restricted mainly to a onedimensional (1D) [B'B n O 3n+3 ] chain. [8,9] Each chain is surrounded by six equally spaced chains forming a triangular lattice in the ab-plane. As seen in Fig.…”

“…[29] For the compounds with 2≤ n < ∞, there are very limited data on physical properties, except for the structural data. [8,9] Very recently, Takami et al reported transport and magnetic properties for the compounds with n=2 -5. [30] According to their susceptibility (χ) measurements, there are no drastic changes in the χ(T ) curve below 300 K for all these compounds, while the slope of χ −1 changes at around 180 K for the compounds with n=2 and 3.…”

Observation of a Large Magnetic Anisotropy in the New 2H-Perovskite Related Oxide Ba8CoRh6O21: Magnetic Measurements on Aligned Single Crystals

“…25,26 Reports in the literature claim the existence of several other commensurate members of this family based on TEM studies of powder samples. 18 However, these typically lack detailed structural characterizations of the materials under investigation, such as atomic coordinates based on Rietveld refinement of powder data and, typically, compositional claims are based on nominal starting compositions.…”

Electrical resistivity and Seebeck coefficient of Sr6Co5O15

“…(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.…”