a novel ferrimagnetic irido-cuprate: irsr2gdcu2o8

2006 Iridium I 8200 A Novel Ferrimagnetic Irido-Cuprate: IrSr 2 GdCu 2 O 8 . — The title compound is prepared from SrCO3, CuO, Gd2O3, and IrO2 under high temperature, high-pressure conditions (1393 K, 60 kbar, Belt-type apparatus). The structure of IrSr2GdCu2O8 is de- termined by Rietveld refinement of powder XRD data. The compound crystallizes in the tetragonal space group P4/mmm and is isostructural with the corresponding Ru-1212 phase. A ferrimagnetic Ir IV —Gd III spin ordering is observed below 15 K. The iridium oxidation state appears to be +4 and that of Cu is +2.5. — (DOS SANTOS-GARCIA, A. J.; AGUIRRE, M. H.; MORAN, E.; SAEZ PUCHE, R.; ALARIO-FRANCO*, M. A.; J. Solid State Chem. 179 (2006) 5, 1296-1302; Lab. Complutense Altas Presiones, Univ. Complutense, E-28040 Madrid, Spain; Eng.) — Schramke 31- 033

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Page 1: A Novel Ferrimagnetic Irido-Cuprate: IrSr2GdCu2O8

2006

IridiumI 8200 A Novel Ferrimagnetic Irido-Cuprate: IrSr2GdCu2O8. — The title compound is

prepared from SrCO3, CuO, Gd2O3, and IrO2 under high temperature, high-pressure conditions (1393 K, 60 kbar, Belt-type apparatus). The structure of IrSr2GdCu2O8 is de-termined by Rietveld refinement of powder XRD data. The compound crystallizes in the tetragonal space group P4/mmm and is isostructural with the corresponding Ru-1212 phase. A ferrimagnetic IrIV—GdIII spin ordering is observed below 15 K. The iridium oxidation state appears to be +4 and that of Cu is +2.5. — (DOS SANTOS-GARCIA, A. J.; AGUIRRE, M. H.; MORAN, E.; SAEZ PUCHE, R.; ALARIO-FRANCO*, M. A.; J. Solid State Chem. 179 (2006) 5, 1296-1302; Lab. Complutense Altas Presiones, Univ. Complutense, E-28040 Madrid, Spain; Eng.) — Schramke

31- 033

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