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- W2580455626 abstract "Abstract An easy metal-ion-steered solvothermal method was developed for the one-step synthesis of monodisperse, uniform Ni x Fe 3-x O 4 polycrystalline nanospheres with tunable sphere diameter (40–400 nm) and composition (0 ≤ x ≤ 0.245) via changing just Ni 2+ /Fe 3+ molar ratio ( γ ). With g increased from 0:1 to 2:1, sphere diameter gradually decreased and crystal size exhibited an inversed U-shaped change tendency, followed by increased Ni/Fe atom ratio from 0% to 0.0888%. An in situ-reduction, coordination-precipitation transformation mechanism was proposed to interpret the metal-ion-steered growth. Size- and composition-dependent static magnetic and microwave absorbing properties were systematically investigated. Saturation magnetization declines with g in a Boltzmann model due to the changes of crystal size, sphere diameter, and Ni content. The coercivity reaches a maximum at γ = 0.75:1 because of the critical size of Fe 3 O 4 single domain (25 nm). Studies on microwave absorption reveal that 150–400 nm Fe 3 O 4 nanospheres mainly obey the quarter-wavelength cancellation model with the single-band absorption; 40–135 nm Ni x Fe 3-x O 4 nanospheres (0 ≤ x ≤ 0.245) obey the one and three quarter-wavelength cancellation model with the multi-band absorption. 150 nm Fe 3 O 4 nanospheres exhibit the optimal EM wave-absorbing property with an absorbing band of 8.94 GHz and the maximum R L of −50.11 dB." @default.
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- W2580455626 date "2017-05-01" @default.
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- W2580455626 title "Monodisperse Ni x Fe 3-x O 4 nanospheres: Metal-ion-steered size/composition control mechanism, static magnetic and enhanced microwave absorbing properties" @default.
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- W2580455626 doi "https://doi.org/10.1016/j.apsusc.2017.01.230" @default.
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