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Title: Growth process and magnetic properties of α-FeSe nanostructures

Growth process and magnetic properties of PbO-type α-Fe{sub x}Se nanostructures with shape changing from nanocacti to nanopetals and then to nanosheets are investigated. With iron acetylacetonate [Fe(acac){sub 3}] and Se powder as raw materials, the diffusion process of Fe atoms dominates the synthesis of α-Fe{sub x}Se nanocacti following phase transitions from FeSe{sub 2} to Fe{sub 3}Se{sub 4} and finally to α-Fe{sub x}Se. When a mixed solution containing Se precursor and Fe(acac){sub 3} was used as the raw material, the formation of FeSe{sub 2} and Fe{sub 3}Se{sub 4} can be avoided and, bended α-Fe{sub x}Se nanopetals can be prepared at 345 °C, which became flat nanosheets with a [001] preferred orientation as extending the reaction time from 1 to 4 h. No superconducting transition occurs in the α-Fe{sub x}Se (0.84 ≤ x ≤ 1.05) nanostructures due to composition heterogeneity or size effect. Magnetic measurements indicate that an antiferromagnetic component with a Néel point at about 45 K dominates the magnetic properties of the α-Fe{sub 0.87}Se nanosheets.
Authors:
; ; ; ; ; ;  [1]
  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China)
Publication Date:
OSTI Identifier:
22273921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANTIFERROMAGNETISM; CRYSTAL STRUCTURE; DIFFUSION; GRAIN ORIENTATION; IRON SELENIDES; LEAD OXIDES; MAGNETIC PROPERTIES; NANOSTRUCTURES; PHASE TRANSFORMATIONS; POWDERS; RAW MATERIALS; SUPERCONDUCTIVITY