Structural and dielectric properties of yttrium substituted nickel ferrites
- Department of Materials Engineering, Faculty of Technology, University of Novi Sad, Bul. Cara Lazara 1, 21000 Novi Sad (Serbia)
- Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad (Serbia)
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 the ac conductivity and decreases the tg δ therefore making the materials better suited for the use in microwave devices.
- OSTI ID:
- 22341835
- Journal Information:
- Materials Research Bulletin, Vol. 49; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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