Influence of Ca-Doping on Structural, Magnetic and Dielectric Properties of Ba₃Co_2-xCa_xFe₂₄O₄₁ Hexaferrite Powders

Abstract:

Influence of Ca substitution on structural, magnetic and dielectric properties of Ba₃Co_2-xCa_xFe₂₄O₄₁ (where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), prepared by Sol-Gel auto-combustion method, has been investigated in present studies. The obtained powder was sintered at 950 oC for 4 hrs. in the static air atmosphere. Structural analysis of Ca-doped Ba₃Co_2-xCa_xFe₂₄O₄₁ powders revealed pure Z-type hexaferrite phase at low temperature. The frequency dependent dielectric constant (Єʹ) and magnetic properties such as remanent magnetization (Mr), saturation magnetization (Ms) and coercivity (Hc) were studied. It is observed that coercivity increased gradually with increase in calcium content. The real dielectric constant (Єʹ) and dielectric loss tangent (tan δ) were studied in the frequency range of 20Hz to 2MHz. The dielectric parameters for all samples show normal dielectric behavior as observed in hexaferrites. Contents of Paper

• Periodical: Solid State Phenomena (Volume 241)
• Pages: 226-236
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.241.226
• Online since: October 2015
• Authors: Neha Solanki, Rajshree B. Jotania*
• Keywords: Ca-Substitution, Low Temperature Sintering, Sol-Gel Auto-Combustion, Z-Type Hexaferrite

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