Preparation of amorphous LiZn ferrites hollow microspheres by self-reactive quenching technology

Abstract

NaCl aqueous solution (15wt%) was used as the quenching medium to prepare amorphous Lithium-Zinc ferrite hollow microspheres (LiZn FHMs) based on self-reactive quenching technology. Investigations by scanning electro microscope, X-ray diffraction, electron diffraction of transmission electron microscope, and differential scanning calorimetry prove that LiZn FHMs are susceptible to amorphization. It is indicated that NaCl aqueous solution (15wt%) has ultra-fast quenching speed, and the growth rate of crystals on LiZn FHMs is so large that the formation and growth of the crystal nucleus are significantly restrained. This is the main reason for the formation of amorphous LiZn FHMs.

Keywords

NaCl / lithium-Zinc ferrite / amorphous hollow microspheres / self-reactive quenching technology

References

[1] Radojevic BB, Molokanov V. Formation and Structure of 54% Zr-46% Cu Amorphous Alloy[J]. J. Mat. Sci. L., 1994, 13: 117-118.

[2] Li YZ, Zhao LZ, Wang C, et al. Communication: Non-monotonic Evolution of Dynamical Heterogeneity in Unfreezing Process of Metallic Glasses[J]. J. Chem. Phys., 2015, 143: 1.

[3] Cai XD, Wang JJ, Xu BC, et al. Preparation of LiZn Ferrites Hollow Microspheres Based Self-reactive Quenching Technology and Study on Their Low-frequency Microwave Absorption Properties[J]. Rare. Met. M., 2015, 44(8): 2038-2043.

[4] Liu JR, Itoh M, Horikawa T, et al. Complex Permittivity, Permeability, and Electromagnetic Wave Absorption of Fe/C(amorphous) and Fe2B/C(amorphous) Nanocomposites[J]. J. Phys. D: Appl. Phys., 2004, 37: 2937-2940.

[5] Cai XD, Wang JJ, Yang RX, et al. Influence of the Foaming Agent on the Particle Size and Microwave Absorption Properties of Hollow Ceramic Microspheres[J]. Int. J. Appl. Ceram. Technol., 2015, 12(S1): E8-E16.

[6] Cai XD, Wang JJ, Xu BC, et al. Effect of Heat-treatment Temperature on Structure and Microwave Electromagnetic Properties of Hollow Multiphase Ceramic Microspheres[J]. J. Chin. Ceram. Soc., 2013, 41: 1331-1338.

[7] Yang M. Technology Handbook of Heat-treatment[M]. 2010 6 75-77.

[8] Zhong Y, Chen DZ, Lan ZW, et al. Effect of Bi₂O₃ on Properties of LiZn Ferrites[J]. J. Inorg. Mat., 2007, 22: 1173-1177.

[9] Lan YH, Gao XX, Qiao Y, et al. Study of Barium Ferrite based on Self-propagating High-temperature Synthesis[J]. Mater. Rev., 2007, 21: 333-335.

[10] Sun C, Sun KN. Preparation and Characterization of Magnesiumsubstituted LiZn Ferrites by a Sol-gel Method[J]. Physica B., 2007, 391: 335-338.

[11] Wang WH. The Nature and Properties of Amorphous Matter[J]. Pr. Phys., 2013, 33(5): 178-351.