Papers by Keyword: Polymerizable Complex Method

Abstract: Synthesis of Sr₃Zn₂Fe₂₄O₄₁ Z-type ferrite was investigated. Precursors of ferrite were prepared by polymerizable complex method. Identification of formed phases in the obtained samples and determination of lattice parameters of Z-type ferrite were performed by powder X-ray diffraction (XRD). Single-phase of Sr₃Zn₂Fe₂₄O₄₁ Z-type ferrite was synthesized by heating at 1463 K for 5hours in air. M-H curve of prepared single-phase Sr₃Zn₂Fe₂₄O₄₁ Z-type ferrite was measured by using vibrating sample magnetometer (VSM). It was revealed that Sr₃Zn₂Fe₂₄O₄₁ Z-type ferrite has larger saturation magnetization (23.5 μ_B/formula unit) than that of Sr₃Co₂Fe₂₄O₄₁ (22.7 μ_B/formula unit) and shows characteristic two-step saturation of magnetization as well as Sr₃Co₂Fe₂₄O₄₁ Z-type ferrite.

Abstract: Synthesis of U-type hexaferrite was investigated in the various strontium-based systems (Sr-Me-Fe-O system, Me = Co, Zn, Cu, and Ni). Precursors of ferrites were prepared by polymerizable complex method. Sr₄Me₂Fe₃₆O₆₀ (Me = Co and Zn) U-type hexaferrites were synthesized at the temperature range between 1423 and 1483 K in air. Coercivity of obtained ferrite was decreased with increasing heat treatment temperatures. Cu substitution reduced formation temperature of U-type hexaferrite.

Abstract: Single-phase Z-type strontium cobalt hexaferrite was prepared by polymerizable complex method. Magnetic properties and dynamic magnetic response for high frequency of the Z-type ferrite were studied. Single-phase Z-type hexaferrite was obtained by heating at 1473K for 5 hours in air. Phase identification and determination of lattice parameters were carried out by powder X-ray diffraction (XRD). Magnetic properties were discussed by measuring of M-H curve with vibrating sample magnetometer (VSM). The complex permeability and permittivity over 0.2-18GHz were measured using a vector network analyzer with transmission-reflection-line (TRL) calibration. The results show that the single-phase Z-type strontium cobalt hexaferrite prepared in this study is one of potential candidates for use as electromagnetic wave absorbing materials in the frequency range 1-3GHz (for hand-held cellular phone and wireless LAN).