Study of dielectric and magnetodielectric properties of Y-type Ba2Mg1.5Ni0.5Fe12O22 hexaferrite

Md. F. Abdullah, P. Pal, S. Patel, K. Chandrakanta, R. Jena, A. Singh
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Abstract

We have investigated dielectric and magnetodielectric (MD) properties of polycrystalline Y-type hexaferrite Ba2Mg1.5Ni0.5Fe12O22 (BMNF). Rietveld refinement of the X-ray diffraction pattern and hexagonal plate-like Field Emission Scanning Electron Microscope (FESEM) micrograph confirms the phase purity with the rhombohedral crystal structure (R-3m space group). Both temperatures dependent dielectric permittivity (e׳) and dielectric loss (tan δ) show an anomaly around 150°C and 290°C. The comparable value of activation energy extracted from impedance spectroscopy above 290°C between σg and σgb indicates that relaxation and conduction mechanism may be attributing to the same entities. Room temperature magnetodielectric (MD) measurement at 1MHz indicates the step like increase at ∼8 kOe in dielectric constant (e) with applied field but a reverse trend is observed for magneto-loss (ML) with step like feature preserving it nature.We have investigated dielectric and magnetodielectric (MD) properties of polycrystalline Y-type hexaferrite Ba2Mg1.5Ni0.5Fe12O22 (BMNF). Rietveld refinement of the X-ray diffraction pattern and hexagonal plate-like Field Emission Scanning Electron Microscope (FESEM) micrograph confirms the phase purity with the rhombohedral crystal structure (R-3m space group). Both temperatures dependent dielectric permittivity (e׳) and dielectric loss (tan δ) show an anomaly around 150°C and 290°C. The comparable value of activation energy extracted from impedance spectroscopy above 290°C between σg and σgb indicates that relaxation and conduction mechanism may be attributing to the same entities. Room temperature magnetodielectric (MD) measurement at 1MHz indicates the step like increase at ∼8 kOe in dielectric constant (e) with applied field but a reverse trend is observed for magneto-loss (ML) with step like feature preserving it nature.
y型Ba2Mg1.5Ni0.5Fe12O22六铁氧体介电和磁介电性能研究
研究了多晶y型六铁体Ba2Mg1.5Ni0.5Fe12O22 (BMNF)的介电和磁介电(MD)性能。x射线衍射图的Rietveld细化和六角形板状场发射扫描电镜(FESEM)显微图证实了具有菱形晶体结构(R-3m空间群)的相纯度。在150°C和290°C附近,温度相关的介电常数(e -变化)和介电损耗(tan δ)均呈现异常。从290℃以上的阻抗谱中提取的活化能σg和σgb的比较值表明,弛豫和传导机制可能属于同一实体。在1MHz下的室温磁介电(MD)测量表明,介电常数(e)随外加磁场的增加呈阶梯状增加,但磁损耗(ML)呈相反的趋势,具有阶梯状特征,保持其性质。研究了多晶y型六铁体Ba2Mg1.5Ni0.5Fe12O22 (BMNF)的介电和磁介电(MD)性能。x射线衍射图的Rietveld细化和六角形板状场发射扫描电镜(FESEM)显微图证实了具有菱形晶体结构(R-3m空间群)的相纯度。在150°C和290°C附近,温度相关的介电常数(e -变化)和介电损耗(tan δ)均呈现异常。从290℃以上的阻抗谱中提取的活化能σg和σgb的比较值表明,弛豫和传导机制可能属于同一实体。在1MHz下的室温磁介电(MD)测量表明,介电常数(e)随外加磁场的增加呈阶梯状增加,但磁损耗(ML)呈相反的趋势,具有阶梯状特征,保持其性质。
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