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Structural and Magnetic Properties Evolution of Co-Nd Substituted M-type Hexagonal Strontium Ferrites Synthesized by Ball-Milling-Assisted Ceramic Process

机译:球磨辅助陶瓷工艺合成的Co-Nd取代的M型六方锶铁氧体的结构和磁性展现

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摘要

M-type hexagonal Sr1-x Co (x) Nd (x) Fe12-x O-19 (x = 0, 0.08, 0.16, and 0.24) has been synthesized by ball milling, followed by calcination in air. The calcined products have been characterized by x-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra, and vibrating sample magnetometry. XRD and SEM analyses confirm the formation of M-type Sr hexaferrite with platelet-like morphology when Sr1-x Co (x) Nd (x) Fe12-x O-19 (x = 0, 0.08, 0.16, and 0.24) precursors are calcined at 950A degrees C in air for 2.5 h. Lattice parameters "a" and "c" values of Sr1-x Co (x) Nd (x) Fe12-x O-19 reflect a very small variation after doping of Nd3+ and Co2+ ions. Average crystallite size of Sr1-x Co (x) Nd (x) Fe12-x O-19 sample, calcined at 1150A degrees C, decreased obviously after doping of Co2+ and Nd3+ ions. This is because the bond energy of Nd3+-O2- is much larger than that of Sr2+-O2-. Magnetic characterization indicates that all the samples exhibit good magnetic properties. Substitution of Sr2+ and Fe3+ ions by Nd3+ and Co2+ ions can improve the specific saturation magnetizations and remanence of Sr1-x Co (x) Nd (x) Fe12-x O-19. Sr0.84Co0.16Nd0.16Fe11.84O19, calcined at 1050A degrees C, has the highest specific saturation magnetization value (74.75 +/- 0.60 emu/g), remanence (45.15 +/- 0.32 emu/g), and magnetic moment (14.34 +/- 0.11 mu (B)); SrFe12O19, calcined at 1150A degrees C, has the highest coercivity value (4037.01 +/- 42.39 Oe). These magnetic parameters make this material a promising candidate for applications such as high-density magnetic recording and microwave absorbing materials.
机译:M型六方SR1-X CO(x)Nd(x)Fe12-x O-19(x = 0,0.08,0.16和0.24)已通过球磨合成,然后在空气中进行煅烧。煅烧产品的特征在于X射线粉末衍射(XRD),扫描电子显微镜(SEM),傅里叶变换红外光谱和振动样品磁力学。 XRD和SEM分析确认当SR1-X CO(x)Nd(x)Fe12-x O-19(x = 0,0.08,0.16和0.24)前体时,用血小板样形态进行M型Sr六己发蛋的形成。在空气中在950A℃下煅烧2.5小时。晶格参数“A”和“C”值SR1-X CO(x)Nd(x)Fe12-x O-19反映了Nd3 +和CO 2 +离子掺杂后的非常小的变化。在1150A℃下煅烧的SR1-X CO(x)Nd(x)Fe12-x O-19样品的平均微晶尺寸在1150A℃下煅烧,在CO 2 +和Nd3 +离子掺杂后明显降低。这是因为ND3 + -O2的粘合能量远大于SR2 + -O2-。磁表征表明所有样品表现出良好的磁性。 SR2 +和Fe3 +离子的取代通过ND3 +和CO 2 +离子可以改善特异性饱和磁化和剩磁的SR1-X CO(x)Nd(x)Fe12-x O-19。 SR0.84Co0.16ND0.16FE11.84O19在1050A C煅烧,具有最高的特定饱和磁化值(74.75 +/- 0.60 EMU / g),剩磁(45.15 +/- 0.32 emu / g)和磁矩( 14.34 +/- 0.11 mu(b)); SRFE12O19在1150A℃下煅烧,具有最高的矫顽力值(4037.01 +/- 42.39 OE)。这些磁性参数使该材料成为高密度磁记录和微波吸收材料等应用的有希望的候选者。

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