Crystal Structure of Ca4.78Cu6O11.60

A 4D Composite Description for Ca0.82(Cu0.65Co0.35O2)

“…The related parent structure is the infinite-layer structure with planar CuO 2 sheets separated by Ca or Sr atoms. , Another family closely related to the previous ones concerns the so-called spin-ladder misfit compounds, where the interpenetration of two sublattices is observed; the first one consists of zigzag chains of edge-sharing CuO 4 units, joined together by bridging O atoms to build ladders; the second one is built with independent edge-sharing CuO 4 chains. The same type of chains has also been observed in other systems: Ca 0.85 CuO 2 , NaCuO 2 , Sr 0.73 CuO 2 , and Ba 2 Cu 3 O 5 . − Another analogy can be found to layered cobalt oxides such as Na x CoO 2 , or Ca 3 Co 4 O 9 - δ . − …”

“…The same type of chains has also been observed in other systems: Ca 0.85 CuO 2 , NaCuO 2 , Sr 0.73 Cu-O 2 , and Ba 2 Cu 3 O 5 . [5][6][7][8][9][10] Another analogy can be found to layered cobalt oxides such as Na x CoO 2 11,12 or Ca 3 Co 4 -O 9-δ . [13][14][15] In these different systems, structural incommensurabilities are often encountered: modulated Bi-based high-T c superconductors, misfit spin-ladder compounds, and misfit lamellar calcium-cobalt oxides.…”

Modulated Structure of the Composite Crystal Ca0.83CuO2

“…One can obtain an approximate structure of a composite crystal through conventional structure re"nement methods by assuming statistical distribution of the atoms (6,7). Taking a larger unit cell with nearly commensurate composition often gives more adequate solution of the structure (17). However, such a structure analysis usually yields a large number of re"nable parameters and it often causes obscure understanding of the structure.…”

Quantitative phase analysis of PBSCCO 2223 precursor powders—an XRD/Rietveld refinement study

“…3321-(Pb, Bi) 3 (Sr, Ca, Bi) 5 CuO 12+δ [71], 11-[M] x [CuO 2 ] (M = Ca, Sr; x = 0.83-0.73) [72], 21-(Sr, Ca) 2 CuO 3 [73], (Sr, Ca)O [74] and CuO [75]. For the 3321 phase the lattice constants were based on those of Pb 2.5 Bi 0.5 Sr 3 Ca 2 CuO 12+δ given by Kusano et al [13].…”

“…For the correct determination of the lattice constants we used silicon as an internal standard of the diffractogram. The lattice constants of the unit cells determined for the 11 and 14-24 phase are based on superstructure approaches of Galez et al [72] and Siegrist et al [69].…”