Electrical and Dielectric Properties of Y3+-Substituted Barium Hexaferrites


AUWAL I. A. , Unal B. , BAYKAL A. , Kurtan U. , Amir M. D. , Yildiz A., et al.

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, cilt.30, ss.1813-1826, 2017 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 30 Konu: 7
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1007/s10948-017-3978-8
  • Dergi Adı: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
  • Sayfa Sayısı: ss.1813-1826

Özet

In this study, Y3+ ion-substituted M-type barium hexaferrites (BaM; BaFe12O19) were fabricated via facile ceramic route. As-prepared powders were characterized by X-ray powder diffractometry (XRD), Fourier transform infrared (FT-IR) spectroscopy, and impedance spectroscopy. XRD (Rietveld) analyses confirmed the presence of a single characterization of all samples (except x = 0.0 and 0.1 samples). The crystallite sizes of products are found in the range of 47.2-63.2 nm. Spectral analysis (FT-IR) also presented the formation of spinel structure for all products. The ac conductivity of the substituted samples was found to initially decrease slightly with increase in Y3+ compared with unsubstituted, and then variation tendency changes at the medium substitution ranges are observed with a different attitude against temperature. In the end, the lower conductivity for high substitutions is recorded and increases as functions of frequency while it also increases with the elevation of temperature. It was observed that ac conductivities of products increased by increasing frequency which indicate that observed ac conductivity is due to both electronic and polaron hopping mechanism.

Abstract In this study, Y3+ ion-substituted M-type barium
hexaferrites (BaM; BaFe12O19) were fabricated via facile
ceramic route. As-prepared powders were characterized
by X-ray powder diffractometry (XRD), Fourier transform
infrared (FT-IR) spectroscopy, and impedance spectroscopy.
XRD (Rietveld) analyses confirmed the presence of a single
characterization of all samples (except x = 0.0 and 0.1
samples). The crystallite sizes of products are found in the
range of 47.2–63.2 nm. Spectral analysis (FT-IR) also presented
the formation of spinel structure for all products. The
ac conductivity of the substituted samples was found to initially
decrease slightly with increase in Y3+ compared with
unsubstituted, and then variation tendency changes at the
medium substitution ranges are observed with a different attitude against temperature. In the end, the lower conductivity
for high substitutions is recorded and increases as
functions of frequency while it also increases with the elevation
of temperature. It was observed that ac conductivities
of products increased by increasing frequency which indicate
that observed ac conductivity is due to both electronic
and polaron hopping mechanism.