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首页> 外文期刊>Journal of the Korean Ceramic Society >Structural, spectral, dielectric and magnetic properties of Co-Cr-substituted hexagonal ferrites with X-type structure
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Structural, spectral, dielectric and magnetic properties of Co-Cr-substituted hexagonal ferrites with X-type structure

机译：结构、光谱、介电和磁性Co-Cr-substituted六角的属性铁氧体交叉形结构

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摘要

Co2+ and Cr3+-substituted SrBaCu2-xCoxCryFe28-yO46 X-type hexaferrite with x = y = 0, 0.1 to 0.5 (step = 0.1) were prepared through auto-combustion sol-gel method and sintered at 1250 degrees C for 5 h which was found from thermal analysis. The thermal investigation, phase detection, spectral, magnetic, and dielectric characteristics of the prepared composition were investigated by TGA, XRD, FTIR, VSM, and dielectric measurement. XRD patterns of the entire composition confirmed the development of a single phase of X-type structure. The enhancement in the lattice parameters and cell volume was observed by varying the Co-Cr concentration, attributed to the larger ionic radii substitution. FTIRspectra of all samples exhibit two absorption peaks in the wavenumber range of 500-550 cm(-1) and 418-425 cm(-1) that confirm the formation of hexaferrite. The dielectric properties have been inspected based on frequency and substitution variation in the sample. The dielectric constant exhibits the increasing trend with the Co-Cr ratio. The enhancement in Ac conductivity was also found by increased substitution ions. Single semi-circles were examined in Nyquist plots, attributed to the contribution of the grain boundaries. Detailed magnetic parameters such as saturation magnetization, remanence, squareness ratio, coercivity, and magneto-crystalline anisotropy constant were measured. By the increase in Co-Cr substitution the increased of saturation magnetization (M-s) from 61.12 emu/g to 64.89 emu/g, the remanence (M-r) from 27.43 emu/g to 30.71 emu/g, and coercivity (H-c) from 1654.56 Oe to 1863.54 Oe was found. Therefore, the synthesized SrBaCu2 X-type hexagonal ferrites with the appropriate amount of Co-Cr substitution are suitable candidates for microwave devices and valuable in longitudinal recording media.
机译：三价铬取代二氧化碳+和SrBaCu2-xCoxCryFe28-yO46交叉形hexaferrite x = y = 0, 0.1到0.5(步骤= 0.1)准备燃烧自动溶胶-凝胶方法和烧结1250度5 h被发现的热分析。相位检测、光谱、磁性和介电特性的准备成分进行了TGA、XRD、红外光谱扫描仪和介电测量。整个构图证实了发展一个阶段的交叉形结构。增强的晶格参数和细胞成交量观察到不同钴铬浓度,归因于较大的离子半径替换。展览两个吸收峰波数500 - 550厘米(1)和418 - 425厘米(1)确认hexaferrite的形成。基于介电性能已经被检查过了在频率和替换的变化样本。增加的趋势与钴铬的比例。增强交流电导率也发现了增加替换离子。在奈奎斯特图检查,归因于吗晶界的贡献。磁饱和等参数磁化剩磁,方形比率,矫顽力和magneto-crystalline各向异性常数测定。替换饱和度的增加磁化(m)从61.12到64.89 (emu / g)emu / g,剩磁(先生)从27.43 emu / g30.71 emu / g,矫顽力(·hc·)从1654.56 Oe1863.54 Oe被发现。合成SrBaCu2交叉形六角铁氧体适量的钴铬替换合适的候选人为微波设备和吗有价值的纵向记录媒体。

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