New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)

We have discovered new arsenide oxides (Fe2As2)(Sr4M2O6) (M = Sc, Cr: M-22426). These materials are isostructural with (Fe2P2)(Sr4Sc2O6), which was found in our previous study. The new compounds are tetragonal with a space group of P4/nmm and consist of the anti-fluorite-type FeAs layer and a perovskite-type blocking layer. These compounds have long interlayer Fe–Fe distances corresponding to the c-axis length; the 15.8 Å in Sc-22426 is the longest in the iron-based pnictide oxide systems. Chemical flexibility of the perovskite block in this system was probed by chromium-containing (Fe2As2)(Sr4Cr2O6). Different trends were found in bond angle and bond length of the new pnictide oxides compared to the reported systems, such as REFePnO. The absence of superconductivity in these compounds is considered to be due to insufficient carrier concentration as in the case of undoped REFeAsO.

[1]  K. Kishio,et al.  Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer , 2009, 0903.3314.

[2]  H. Hosono,et al.  Comparison of crystal structures and the effects of Co substitution in a new member of the Fe-1111 superconductor family AeFeAsF (Ae = Ca and Sr): a possible candidate for a higher-Tc superconductor , 2008, 0811.4614.

[3]  Wei Bao,et al.  Neutron-diffraction measurements of magnetic order and a structural transition in the parent BaFe2As2 compound of FeAs-based high-temperature superconductors. , 2008, Physical review letters.

[4]  D. Johrendt,et al.  Synthesis, crystal structure and spin-density-wave anomaly of the iron arsenide-fluoride SrFeAsF , 2008, 0810.2120.

[5]  H. Hosono,et al.  Superconductivity induced by co-doping in quaternary fluoroarsenide CaFeAsF. , 2008, Journal of the American Chemical Society.

[6]  P. Adamson,et al.  Structure and superconductivity of LiFeAs. , 2008, Chemical communications.

[7]  H. Eisaki,et al.  Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln = La, Nd) , 2008, 0806.3821.

[8]  J. Attfield,et al.  High pressure synthesis of late rare earth RFeAs(O,F) superconductors; R = Tb and Dy. , 2008, Chemical communications.

[9]  Marcus Tegel,et al.  Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2. , 2008, Physical review letters.

[10]  A. Williams,et al.  Intrinsic Properties of Stoichiometric LaFePo , 2008, 0805.2149.

[11]  S. W. Kim,et al.  Crystallographic phase transition and high-Tc superconductivity in LaFeAsO:F , 2008, 0804.3569.

[12]  Hideo Hosono,et al.  Iron-based layered superconductor La[O(1-x)F(x)]FeAs (x = 0.05-0.12) with T(c) = 26 K. , 2008, Journal of the American Chemical Society.

[13]  N. Barrier,et al.  Structural chemistry and metamagnetism of an homologous series of layered manganese oxysulfides. , 2006, Journal of the American Chemical Society.

[14]  W. J. Zhu,et al.  Synthesis and structure of layered manganese oxychalcogenides : Sr2CuMnO3S and Sr4Cu2Mn3O7.5Q2 (Q=S, Se) , 2000 .

[15]  W. Jeitschko,et al.  Quaternary rare earth transition metal arsenide oxides RTAsO (T=Fe, Ru, Co) with ZrCuSiAs type structure , 2000 .

[16]  F. Izumi,et al.  A Rietveld-Analysis Programm RIETAN-98 and its Applications to Zeolites , 2000 .

[17]  K. Kishio,et al.  New Candidates for Superconductors; A Series of Layered Oxysulfides (Cu2S2)(Srn+1MnO3n−1) , 1999 .

[18]  A. Jacobson,et al.  A2Cu2CoO2S2 (A = Sr, Ba), A Novel Example of a Square-Planar CoO2 Layer , 1997 .

[19]  W. J. Zhu,et al.  Crystal Structure of New Layered Oxysulfides: Sr3Cu2Fe2O5S2and Sr2CuMO3S (M=Cr, Fe, In) , 1997 .

[20]  W. J. Zhu,et al.  Unusual layered transition-metal oxysulfides : Sr2Cu2MO2S2 (M = Mn, Zn) , 1997 .

[21]  M. Reehuis,et al.  The rate earth transition metal phosphide oxides LnFePO, LnRuPO and LnCoPO with ZrCuSiAs type structure , 1995 .

[22]  H. Schäfer,et al.  Über Oxidpnictide: Zur Kenntnis von A2Mn3B2O2 mit A = Sr, Ba und B = As, Sb, Bi / On Oxidpnictides: Preparation and Crystal Structure of A2Mn3B2O2 with A = Sr, Ba and B = As, Sb, Bi , 1979 .