www.cheminform.wiley-vch.de

CobaltI 7200 DOI: 10.1002/chin.201018023

New Oxypnictide Superconductors: PrOFe1-xCoxAs. — Title compounds with x ≤ 0.3 are prepared for the first time by the sealed tube method from Pr, Pr6O11, Co3O4, FeAs, and As (evacuated silica tubes, 950 °C, 24 h; sintering at 1100 °C, 48 h). The products are characterized by powder XRD, Moessbauer spectroscopy, electrical resis-tivity, and magnetic measurements. The PrOFe1-xCoxAs phases crystallize with the ZrCuSiAs-type structure in the tetragonal space group P4/mmm. Compounds with x = 0.05, 0.10, and 0.15 show superconducting transitions. The maximum transition temperature of 14.2 K occurs for PrOFe0.9Co0.1As. — (PRAKASH, J.; SINGH, S. J.; DAS, D.; PATNAIK*, S.; GANGULI, A. K.; J. Solid State Chem. 183 (2010) 2, 338-343; Sch. Phys. Sci., Jawaharlal Nehru Univ., New Delhi 110 067, India; Eng.) — W. Pewestorf

18- 023

ChemInform 2010, 41, issue 18 © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim