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Title: Structural and dielectric properties of yttrium substituted nickel ferrites

Graphical abstract: - Highlights: • Dense NiFe{sub 2−x}Y{sub x}O{sub 4} ceramics (with 0 ≤ x ≤ 0.3) were prepared. • Pure spinels were obtained for x ≤ 0.07 while for x ≥ 0.15 samples had secondary phases. • With addition of yttrium, ac conductivity slightly increased. • We suggest several effects that can explain the observed changes in ac conduction. • With addition of yttrium, dielectric constant increased while the tg δ decreased. - Abstract: The influence of Y{sup 3+} ions on structural and dielectric properties of nickel ferrites (NiFe{sub 2−x}Y{sub x}O{sub 4}, where 0 ≤ x ≤ 0.3) has been studied. The as-synthesized samples, prepared by the co-precipitation method, were analyzed by XRD and FTIR which suggested that Y{sup 3+} ions were incorporated into the crystal lattice for all the samples. However, the XRD analysis of the sintered samples showed that secondary phases appear in the samples with x > 0.07. The samples have densities greater than 90% TD and the SEM images showed that the grain size decreases with the addition of yttrium. Dielectric properties measured from 150 to 25 °C in the frequency range of 100 Hz–1 MHz showed that the addition of yttrium slightly increases themore » ac conductivity and decreases the tg δ therefore making the materials better suited for the use in microwave devices.« less
Authors:
 [1] ;  [1] ; ;  [2] ;  [1]
  1. Department of Materials Engineering, Faculty of Technology, University of Novi Sad, Bul. Cara Lazara 1, 21000 Novi Sad (Serbia)
  2. Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad (Serbia)
Publication Date:
OSTI Identifier:
22341835
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 49; Other Information: Copyright (c) 2013 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:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CRYSTAL LATTICES; FERRITE; FERRITES; FOURIER TRANSFORMATION; GRAIN SIZE; INFRARED SPECTRA; NICKEL; PERMITTIVITY; SCANNING ELECTRON MICROSCOPY; SPINELS; SYNTHESIS; X-RAY DIFFRACTION; YTTRIUM; YTTRIUM IONS