TY - GEN
T1 - Magnetic and absorption characteristics of Mn and Ti subsituted barium hexaferrite for microwave absorber
AU - Priyono,
AU - Manaf, Azwar
PY - 2009/12/1
Y1 - 2009/12/1
N2 - This paper reports our recent investigation on Mn+2 and Ti +4 ions substituted Barium Hexaferrites. Materials of nominal compositions BaFe12-2x(MnTi)xO19 (x = 0.0; 1.5 and 2.5) were prepared through a two-stage process by mechanical alloying and successive sintering. The first stage was the preparation of (Fe,Mn,Ti) 2O3 obtained from partial substitution of Mn+2 and Ti+4 ions in a single phase Fe2O3.. This was followed by the second stage in which BaCO3 and (Fe,Mn,Ti) 2O3 components were mechanically alloyed. A successive solid state reaction at different sintering temperatures has lead to the formation of Mn and Ti substituted barium hex ferrite. Phase identification by XRD confirmed the single phase material. Microstructure by TEM showed grains are extremely fine about 30 nm in size. The electrons diffraction rings of the area shown uniform intensity around Debye rings indicating that grains are randomly oriented. Evaluation on the magnetic characteristic for the materials indicated that coercivity decreased progressively as the number of Mn+2 and Ti+4 ions increased although this was also followed by a less significant decrease in the total magnetization. As to the microwave absorber, reflection and transmission coefficients as well as reflection loss in the frequency range 1- 6 GHz were derived. In this paper, Absorption performances of nanocrystalline Mn and Ti substituted barium hex ferrite materials are also reported.
AB - This paper reports our recent investigation on Mn+2 and Ti +4 ions substituted Barium Hexaferrites. Materials of nominal compositions BaFe12-2x(MnTi)xO19 (x = 0.0; 1.5 and 2.5) were prepared through a two-stage process by mechanical alloying and successive sintering. The first stage was the preparation of (Fe,Mn,Ti) 2O3 obtained from partial substitution of Mn+2 and Ti+4 ions in a single phase Fe2O3.. This was followed by the second stage in which BaCO3 and (Fe,Mn,Ti) 2O3 components were mechanically alloyed. A successive solid state reaction at different sintering temperatures has lead to the formation of Mn and Ti substituted barium hex ferrite. Phase identification by XRD confirmed the single phase material. Microstructure by TEM showed grains are extremely fine about 30 nm in size. The electrons diffraction rings of the area shown uniform intensity around Debye rings indicating that grains are randomly oriented. Evaluation on the magnetic characteristic for the materials indicated that coercivity decreased progressively as the number of Mn+2 and Ti+4 ions increased although this was also followed by a less significant decrease in the total magnetization. As to the microwave absorber, reflection and transmission coefficients as well as reflection loss in the frequency range 1- 6 GHz were derived. In this paper, Absorption performances of nanocrystalline Mn and Ti substituted barium hex ferrite materials are also reported.
KW - Ferrites
KW - Magnetic properties
KW - Microwave absorption
UR - http://www.scopus.com/inward/record.url?scp=77950929065&partnerID=8YFLogxK
U2 - 10.1109/ICICI-BME.2009.5417213
DO - 10.1109/ICICI-BME.2009.5417213
M3 - Conference contribution
AN - SCOPUS:77950929065
SN - 9781424449996
T3 - International Conference on Instrumentation, Communication, Information Technology, and Biomedical Engineering 2009, ICICI-BME 2009
BT - International Conference on Instrumentation, Communication, Information Technology, and Biomedical Engineering 2009, ICICI-BME 2009
T2 - International Conference on Instrumentation, Communication, Information Technology, and Biomedical Engineering 2009, ICICI-BME 2009
Y2 - 23 November 2009 through 25 November 2009
ER -