STRUCTURAL, THERMAL AND MAGNETIC PROPERTIES OF BARIUM-FERRITE POWDERS SUBSTITUTED WITH Mn, Cu OR Co AND X (X = Sr AND Ni) PREPARED BY THE SOL-GEL METHOD

Gurbuz A., ONAR N., ÖZDEMİR İ., KARAOĞLANLI A. C., Celik E.

MATERIALI IN TEHNOLOGIJE, vol.46, no.3, pp.305-310, 2012 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 3
  • Publication Date: 2012
  • Journal Name: MATERIALI IN TEHNOLOGIJE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.305-310
  • Keywords: sol-gel, copper-manganese substitution, barium ferrite, MICROWAVE-ABSORPTION, HEXAGONAL FERRITE, ZN, MICROSTRUCTURE, HEXAFERRITES, TEMPERATURE, COERCIVITY, PARTICLES
  • Dokuz Eylül University Affiliated: Yes

Abstract

In this study, Ferrite A (undoped barium hexaferrite), Ferrite B (MnCuNi-doped barium hexaferrite), Ferrite C (MnCuSr-doped barium hexaferrite), Ferrite D (MnCoNi-doped barium hexaferrite) and Ferrite E (MnCoSr-doped barium hexaferrite) powders were prepared by sol-gel processing. The produced powders were calcined at 550 degrees C for 6 h and sintered at 1000 degrees C for 5 h to obtain the required phases. The powders were characterized by differential thermal analysis/thermogravimetric analysis (DTA/TG), X-ray diffractometry (XRD) and scanning electron microscopy (SEM), and vibrating-sample magnetometry (VSM). The XRD patterns indicated that the pure barium ferrite phase was not obtained. The presence of M-type BaFe11.6Mn0.4O19 was confirmed in the Ferrite B and Ferrite D patterns. In the Ferrite C pattern, there were the phases of BaFe12O19, Ba2Cu2Fe12O22(X or Z-type) and Sr3Fe2O6.16. The Ba0.5Sr0.5Fe12 phase was easily observed in the Ferrite E pattern. The results showed that the dopant materials significantly change the particle shape of Ferrite A powders, but also lower the value of the coercivity. A higher saturation magnetization was observed for the Ferrite D powder.