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Author Liu, Y. ♦ Zhang, S. B. ♦ Tan, S. G. ♦ Yuan, B. ♦ Kan, X. C. ♦ Zu, L. ♦ Sun, Y. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ACTIVATION ENERGY ♦ ANTIFERROMAGNETISM ♦ ATOMIC FORCE MICROSCOPY ♦ CATIONS ♦ COPPER OXIDES ♦ FLUORITE ♦ GROUND STATES ♦ IRON ♦ IRON IONS ♦ OXYGEN IONS ♦ SELENIUM IONS ♦ SEMICONDUCTOR MATERIALS ♦ SOLIDS ♦ SPACE GROUPS ♦ SPECIFIC HEAT ♦ SULFUR ♦ SYNTHESIS ♦ TETRAGONAL LATTICES
Abstract A new series of sulfur-substituted iron-oxychalcogenides Nd{sub 2}Fe{sub 2}Se{sub 2−x}S{sub x}O{sub 3} (0≤x≤0.4) was synthesized by solid state reaction method, and investigated by structure, transport, magnetic and specific heat measurements. The compounds crystallize in the layered tetragonal structure with I4/mmm space group, and show semiconducting behavior. The large discrepancy between the activation energies for conductivity, E{sub ρ} (152–202 meV), and thermopower, E{sub S} (15.6–39.8 meV), indicates the polaronic transport mechanism of the carrier. The parent compound Nd{sub 2}Fe{sub 2}Se{sub 2}O{sub 3} exhibits a frustrated antiferromagnetic (AFM) ground state, and the S-substitution induces an enhanced ferromagnetic (FM) component and possible increased degree of frustration. - Graphical abstract: The crystal structure of Nd{sub 2}Nd{sub 2}Fe{sub 2}Se{sub 2−x}S{sub x}O{sub 3} is built up by stacking fluorite-like Nd{sub 2}O{sub 2} layers and anti-CuO{sub 2}-type Fe{sub 2}O(Se/S){sub 2} layers with Fe{sup 2+} cations coordinated by two in-plane O{sup 2-} and four Se{sup 2-} above and below the square Fe{sub 2}O plane. - Highlights: • We have synthesized a new series of layered iron-oxychalcogenides Nd{sub 2}Fe{sub 2}Se{sub 2−x}S{sub x}O{sub 3}. • They crystallize in layered tetragonal structure and show semiconducting behavior. • The transport analysis indicates the polaronic transport mechanism of the carrier. • The parent compound shows a frustrated antiferromagnetic (AFM) ground state. • The S-substitution induces an enhanced ferromagnetic (FM) component.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-01-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 221


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