High-oxygen-pressure synthesis, structure and properties of the infinite-chain compound Sr0.73CuO2

Direct fabrication of La0.7Sr0.3FeO3 nanofibers with tunable hollow structures by electrospinning and their gas sensing properties

“…All the diffraction peaks of samples calcined at 500-700°C are well matched with La 0.7 Sr 0.3 FeO 3 (JCPDS 89-1269), respectively, except a small peak located at 25.2°( 2h) corresponding to SrCO 3 phase (JCPDS 05-0418). This phenomenon was also observed by Karpinski et al [22,23]. Most of the alkaline earth metal oxides and rare earth metal oxides, in particular BaO, SrO, and Re 2 O 3 , contain metal carbonate [24,25].…”

Crystal Structure of Ca4.78Cu6O11.60

“…CaCuO phases indeed exist but they are prepared at high pressure only and have completely di!erent structures (25,26). Surprisingly, Sr Cu O (or Sr CuO ), with a structure similar to that of Ca Cu O , is also prepared at high pressure (27). The particular value of the Ca:Cu ratio in the title compound has another consequence: six O atoms have "ve neighboring cations while the six others have only four.…”

X-Ray Single Crystal Structure Analysis of the Three-Leg-Ladder Compound (Sr, Ca)4Cu6O10

“…Pure edge-sharing CuO units lead to CuO ribbons (double chains) in ambient pressure SrCuO (5) or to onedimensional single chains in high-oxygen-pressure compounds Sr CuO (6,7) or Ca CuO (8). These materials are not superconducting but show an interesting magnetic behavior (7).…”

“…'' It is now important to know in which structural unit superconductivity occurs-in the infinite chain or in the ladder layers. We succeeded in growing single crystals containing only one of these structural features: Sr CuO with infinite CuO chains (6,7), and (Sr, Ca) Cu O with a Cu O three-leg-ladder sublattice which is discussed here. This material was first synthesized by Hiroi et al (10) at a pressure p"6 GPa.…”