skip to main content

SciTech ConnectSciTech Connect

Title: Synthesis, structure and properties of layered iron-oxychalcogenides Nd{sub 2}Fe{sub 2}Se{sub 2−x}S{sub x}O{sub 3}

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 parentmore » compound shows a frustrated antiferromagnetic (AFM) ground state. • The S-substitution induces an enhanced ferromagnetic (FM) component.« less
Authors:
 [1] ;  [1] ; ; ; ;  [1] ;  [1] ;  [2] ;  [2]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22443507
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 221; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 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