Increased Reflection Loss of SrFe_(11.9-x) In_0.1Sn_x/2Zn_x/2O₁₉ (x = 0.0; 0.10; 0.35 and 0.50): A Microwave Absorber Induced by Reduced Coercivity

Abstract:

In this study, an increase in the reflection loss (RL) value for SrFe_(11.9-x)In_0.1Sn_x/2Zn_x/2O₁₉ samples (x = 0; 0.10; 0.35 and 0.50) is reported. The X-ray diffraction (XRD) pattern of all samples confirmed that the SrFe_(11.9-x)In_0.1Sn_x/2Zn_x/2O₁₉ samples (x = 0, 0.10, 0.35, and 0.50) posses polycrystalline with single phase. We have demonstrated that co-substitution of Zn²⁺ and Sn⁴⁺ ions with a fraction of x = 0.10 reduced the coercivity of the pure nano strontium hexaferrite (SHF) from 346.80 kA/m to 50.34 kA/m. The substitution of Fe³⁺ ion by Sn²⁺ and Zn⁴⁺ affect the coercivity decreased significantly. Meanwhile, the saturation magnetization and remanence slightly decreases. Hence, the decreasing of coercivity cause the reflection loss (RL) increase from -16.43 dB to -25.62 dB. We believed the RL value can be increased efficiently by reducing the coercivity of the sample obtained by co-substitution of Zn²⁺ and Sn⁴⁺ ions to Fe³⁺ in the main phase of SrFe_11.9In_0.1O₁₉.

• Periodical: Key Engineering Materials (Volume 940)
• Pages: 47-54
• DOI: https://doi.org/10.4028/p-amgj8y
• Online since: January 2023
• Authors: Achmad Yaqin*, Azwar Manaf, Iwan Sugihartono, Yana Taryana, Yuda Zainal
• Keywords: Coercivity, Radar Absorbing Materials, Reflection Loss, Solid State Reaction

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