Universität zu Köln

Mikhailova, D., Kuo, C. Y., Reichel, P., Tsirlin, A. A., Efimenko, A., Rotter, M., Schmidt, M., Hu, Z., Pi, T. W., Jang, L. Y., Soo, Y. L., Oswald, S. and Tjeng, L. H. (2014). Structure, Magnetism, and Valence States of Cobalt and Platinum in Quasi-One-Dimensional Oxides A(3)CoPtO(6) with A = Ca, Sr. J. Phys. Chem. C, 118 (10). S. 5463 - 5470. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7455

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Abstract

Two quasi-one-dimensional oxides, Ca3CoPtO6 and Sr3CoPtO6, were synthesized and characterized. A combination of X-ray absorption spectroscopy at the Co-K-, Co-L-2,L-3-, and Pt-L-3-edges and X-ray photoelectron spectroscopy establishes unambiguously the divalent state of Co and the tetravalent state of Pt in both compounds, in contrast to the earlier assumption of the Co3+ and mixed Pt2+/Pt2+ valence states. Magnetization measurements reveal the paramagnetic behavior down to 2 K with strong evidence for an unquenched orbital moment of the high-spin Co2+. The simple paramagnetic behavior of A(3)CoPtO(6) contrasts with the magnetic transitions observed in Ca3CoRhO6, Sr3CoIrO6, and other isostnictural materials. This difference is ascribed to the nonmagnetic 5d(6) state of Pt4+ that prevents magnetic couplings between the Co2+ ions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mikhailova, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuo, C. Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reichel, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tsirlin, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Efimenko, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rotter, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hu, Z. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pi, T. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jang, L. Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Soo, Y. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Oswald, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tjeng, L. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-443401
DOI:	10.1021/jp411503s
Journal or Publication Title:	J. Phys. Chem. C
Volume:	118
Number:	10
Page Range:	S. 5463 - 5470
Date:	2014
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7455
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOTAL-ENERGY CALCULATIONS; X-RAY-ABSORPTION; CRYSTAL-STRUCTURE; CA3CO2O6; SPIN; MAGNETIZATION; CA3CORHO6; IONS Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44340