？ TIAN M B. Magnetic Materials [M](in Chinese). Beijing: Tsinghua University Press, 2001: p71.
[2]
？ OTT G, WRBA J, LUCKE R. Recent developments of Mn–Zn ferrites for high permeability applications [J]. J Magn Magn Mater, 2003, 254/255: 535–537.
[3]
？ ZASPALIS V T, TSAKALOUDI V, KOLENBRANDER M. The effect of dopants on the incremental permeability of MnZn-ferrites [J]. J Magn Magn Mater, 2007, 313(1): 29–36.
[4]
？ NAKATA A, CHIHARA H. Microscopic study of grain-boundary region in polycrystalline ferrites [J]. J Appl Phys, 1985, 57(8): 4177– 4179.
[5]
？ TOOLENAAR F. Silica-induced exaggerated grain growth in MnZn ferrite [J]. J Mater Sci, 1998, 23(9): 3144–3450.
[6]
？ LI X, REN P, ZHANG J X, et al. Preparation and magnetic properties of Mn–Zn ferrites by the Co-precipitation method [J]. J Wuhan Univ Technol Mater Sci Ed, 2009, 24(6): 875–878.
[7]
？ CHEN S H, CHANG S C, TSAY C Y, et al. Improvement on magnetic power loss of MnZn-ferrite materials by V2O5 and Nb2O5 co-doping [J]. J Eur Ceram Soc, 2001, 21(10–11): 1931–1935.
[8]
？ JI H N, LAN Z W, YU Z, et al. Influence of Sn-substitution on temperature dependence and magnetic disaccomodation of manganese–zinc ferrites [J]. J Magn Magn Mater, 2009, 321(14): 2121–2124.
[9]
？ HUANG A P, HE H H, FENG Z K. Effects of SnO2 addition on the magnetic properties of manganese zinc ferrites [J]. J Magn Magn Mater, 2006, 301(2): 331–335.
[10]
？ SUN K, LAN Z W, YU Z, et al. Analysis of losses in NiO doped MnZn ferrites [J]. J Alloys Compd, 2009, 468(1–2): 315–320.
[11]
？ FAN J, SALE F R. The microstructures, magnetic properties and impedance analysis of Mn–Zn ferrites doped with B2O3 [J]. J Eur Ceram Soc, 2000, 20(16): 2743–2751.
[12]
？ FUJITA A, GOTOH S. Temperature dependence of core loss in Co- substituted MnZn ferrites [J]. J Appl Phys, 2003, 93(10): 7477–7479.
[13]
？ LI H H, FENG Z K, HE H H, et al. Effects of Fe2+ content in raw materials on Mn–Zn ferrite magnetic properties [J]. J Magn Magn Mater, 2001, 237(2): 153–157.
[14]
？ LI L Z, LAN Z W, YU Z, et al. Effects of Co-substitution on wide temperature ranging characteristic of electromagnetic properties in MnZn ferrites [J]. J Alloys Compd, 2009, 476(1–2): 755–759.
[15]
？ ZHANG C F, ZHONG X C, YU H Y, et al. Effects of cobalt doping on the microstructure and magnetic properties of Mn–Zn ferrites prepared by the co-precipitation method [J]. Physica B, 2009, 404(16): 2327– 2331.
[16]
？ FENG J, GUO L Q, XU X D, et al. Hydrothermal synthesis and characterization of Mn1–xZnxFe2O4 nanoparticles [J]. Physica B, 2007, 394(1): 100–103.
[17]
？ JOSEYPHUS R J, NARAYANASAMY A, et al. Synthesis and magnetic properties of the size-controlled Mn–Zn ferrite nanoparticles by oxidation method [J]. J Phys Chem Solids, 2006, 67(7): 1510–1517.
[18]
？ ZHANG Y D, LAN Z W, YU Z. The influence of Nb2O5 additive on microstructure and properties of high frequency MnZn power ferrite [J]. J Magn Mater Devices, 2003, 34(5): 8–10.
[19]
？ ZHANG S Y, LU Q. Basics of Magnetic Materials [M](in Chinese). Beijing: Science Press, 1988: p58.
[20]
？ CHARLES K. Introduction to Solid State Physics [M] (in Chinese). Beijing: Chemical Industry Press, 2005: p233
[21]
？ SINGHA A K, GOELB T C, MENDIRATTA R G. High performance Ni-substituted Mn–Zn ferrites processed by soft chemical technique [J]. J Magn Magn Mater, 2004, 281(2–3): 276–280.
[22]
？ SINGHA A K, MENDIRATTA R G, et al. Magnetic properties of Mn-substituted Ni–Zn ferrites [J]. J Appl Phys, 2002, 92(7): 3872– 3876.
[23]
？ SHOKROLLAHI H, JANGHORBAN K. Effect of Bi2O3 doping on the Curie temperature, Q factor and linear shrinkage of Mn–Zn ferrites [J]. Iran J Sci Technol Trans B Eng, 2007(31): 441–445.
