Synthesis, Structure and Magnetic Properties of New Layered Iron-Oxychalcogenide Na2Fe2OSe2
J. B. He, D. M. Wang, H. L. Shi, H. X. Yang, J. Q. Li, and G. F. Chen
TL;DR
This study reports the synthesis, structural analysis, and magnetic properties of a new layered iron-oxychalcogenide, Na2Fe2OSe2, revealing its semiconducting behavior and antiferromagnetic transition at 73 K.
Contribution
The paper introduces a novel layered iron-oxychalcogenide compound with detailed structural and magnetic characterization, expanding the family of iron-based materials.
Findings
Na2Fe2OSe2 is a semiconductor with 0.26 eV activation energy.
It exhibits an antiferromagnetic transition at 73 K.
Displays two-dimensional short-range spin correlations above TN.
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] blocks and double layers of Na. Conductivity study shows that Na2Fe2OSe2 is a semiconductor with activation energy of 0.26 eV. Magnetic susceptibility and heat capacity measurements reveal 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, arises as a result of two-dimensional short-range spin correlation.
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