The Influence of Sintering Temperature and Mn-Ti Doped BaFe₁₂O₁₉ on the Microwave Absorbing Properties

Abstract:

The effect of sintering temperature and Mn-Ti (x = 0.1 and 0.5 % mol) doped in Barium hexaferrite (BaFe₁₂O₁₉) on the microwave absorption properties have been investigated. The BaFe_(12-2x)Mn_xTi_xO₁₉ samples were prepared by using a solid state reaction method from technical grade materials of BaCO₃, Fe₂O₃, MnO₂, and TiO₂. The permagraph and vector network analyzer (VNA) measurement with frequency of 4 – 10 GHz were used to determine the magnetic properties and microwave absorbing properties, respectively. The magnetic induction and magnetizing force (B-H) curve analysis of BaFe_(12-2x)Mn_xTi_xO₁₉ revealed that by increasing the Mn-Ti dopant concentrations, the remanence (Br) and BH(max) increases, meanwhile, the H_CB value decreases for both 1100 and 1150^oC. The frequency dependence of reflection loss (RL) measurement given anoptimum value of-26.15 dB at frequency of 9.18 GHz which obtained by x = 0.1% mol Mn-Ti (1100^oC). The maximum absorption peak was achieved for 0.5 % mol Mn-Ti sample with ~98.3 % at 9.18 GHz. By controlling the sintering temperature and Mn-Ti dopant concentration, the RL and absorption behavior can be modified to desirable values and also indicates that higher Mn-Ti dopant concentration (0.5% mol) possess better absorbing characteristics. Furthermore, it was found that complex permitivitty and permeability values of BaFe₁₂O₁₉ can be modified by controlling the Mn-Ti dopant concentration.

• Periodical: Applied Mechanics and Materials (Volumes 754-755)
• Pages: 733-737
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.754-755.733
• Online since: April 2015
• Authors: M.N. Nasruddin, Tulus Ikhsan Nasution, M.S. Achmad, K. Candra, F.N. Lukman, P. Sebayang, Irwana Nainggolan
• Keywords: Bariumhexaferrite, Microwave Absorber, Mn-Ti Ions, Permeability, Permittivity, Reflection Loss

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