Preparation of M-type Barium Hexaferrite and Studying Structural and Microwave Properties

H Mubarak, Tahseen; Ali Salman, Lubab; Thiab Alwan, Saib; Sulaiman Mahmood, Hussein

	Preparation of M-type Barium Hexaferrite and Studying Structural and Microwave Properties
Diyala Journal For Pure Science
Article 1, Volume 13, Issue 2, 2017, Pages 167-182
Authors
Tahseen H Mubarak; Lubab Ali Salman; Saib Thiab Alwan; Hussein Sulaiman Mahmood
Abstract
M-type Barium hexaferrite (BaFe12O19) were prepared using sol-gel auto composition method which represent substantial magnetic materials and utilized as microwave absorbers and electronic devices. The powder was obtained after auto-composition procedure, then calcined at different temperatures700℃,800℃ and 900℃ for 3hour. The XRD tests showed that difficultly of preparing the hexagonal phase directly after auto-composition procedure, but for the sample which calcined at 700℃ shows the presence of intermediate phase (BaFe2O4) and the existence of (γ-Fe2O3) with barium hexaferrite (BaFe12O19) formation, when the temperature at 800℃, hexagonal phase formation was observed. The average grain size was estimated from SEM micrographs about (0.5, 0.6 and 0.8 µm) at 800℃,900℃ and 1000℃ respectively. Microwave absorbing characteristic studied within X-band region using VNA (Vector Network Analyzer), it observed maximum reflection loss-26.61dB at 11.22GHz for the specimens that sintered at 1000℃ , while the specimens which sintered at 800℃ showed attenuation peaks exceeded -20 dB because it contains granules sufficiently small to approach single domain characteristic therefore it was actively participating in the attenuation. The relative complex permittivity and permeability were calculated by using Nicolson-Ross-Wier (NRW) method for resonance attenuation peaks.
Keywords
hexagonal phase; Nicolson; ROSS; Wier; single domain; Barium; VNA

Statistics Article View: 193 PDF Download: 23