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Microstructure, magnetism, and high‐frequency performance of polycrystalline Ni 0.5 Zn 0.5 Sm 0.025 Ho x Fe 1.975− x O 4 ferrites
Author(s) -
Yang Pao,
Qi Hongbin,
Liu Zhiqing,
Fu Xiuli,
Peng Zhijian
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16652
Subject(s) - materials science , curie temperature , microstructure , crystallite , magnetism , analytical chemistry (journal) , coercivity , magnetization , sintering , dopant , grain size , nanocrystalline material , nuclear magnetic resonance , doping , mineralogy , condensed matter physics , ferromagnetism , metallurgy , chemistry , nanotechnology , magnetic field , physics , optoelectronics , chromatography , quantum mechanics
Novel polycrystalline Ni 0.5 Zn 0.5 Sm 0.025 Ho x Fe 1.975− x O 4 ( x = 0‐0.06) ferrites were fabricated by a traditional solid‐state reaction sintering method. The codoping effects of Sm and Ho on the microstructure, magnetism, and high‐frequency performance of Ni–Zn ferrites were investigated. The substitution of Sm 3+ and Ho 3+ ions led to an apparent increase in the lattice constants. However, further increasing the addition of both dopants introduced SmFeO 3 or HoFeO 3 foreign phases at the boundaries of the polycrystalline grains. As the content of Ho 3+ ions increased, the relative density and average grain size of the specimens decreased accordingly. Moreover, the substitution of Sm 3+ clearly decreased the saturation magnetization and complex permeability, which further decreased with the doping of Ho 3+ . The evolution of the Curie temperature showed an opposite trend, reaching the highest temperature of 278°C when x = 0.03. Similarly, the coercivity and resonance frequencies also displayed opposite trends compared to those of the saturation magnetization and complex permeability. The codoping of Sm 3+ and Ho 3+ more effectively lowered the magnetic and dielectric loss tangent of the specimens compared with the undoped or single dopant modified ferrites.