학술논문
Synthesis, structure, and magnetic properties of the layered iron oxychalcogenide Na2 Fe2 Se2 O.
Document Type
Article
Author
Source
Subject
*CHALCOGENIDES
*INORGANIC compounds
*X-ray diffraction
*ELECTRIC conductivity
*SEMICONDUCTORS
*MAGNETIC susceptibility
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Language
ISSN
1098-0121
Abstract
A new layered iron oxychalcogenide, Na2Fe2OSe2 has been synthesized and structurally characterized by powder x-ray diffraction. The structure is formed by alternate stacking of the newly discovered [Fe2OSe2]²- blocks and double layers of Na+. Conductivity study shows that Na2Fe2OSe2 is a semiconductor with an activation energy of 0.26 eV. Magnetic susceptibility and heat capacity measurements reveal that an antiferromagnetic phase transition occurs at TN = 73 K. A broad maximum of magnetic susceptibility and a slow decay of the specific heat above TN arise as a result of two-dimensional short-range spin correlation. [ABSTRACT FROM AUTHOR]