Ferrite material with indoor temperature broadband high magnetocapacitance effect and preparation method thereof

Abstract

The invention relates to a ferrite material with indoor temperature broadband high magnetocapacitance effect and a preparation method thereof; the ferrite material has a molecular formula of AFe12-xMxO19, wherein A is at least one of Ba or Sr, M is at least one of Sc, Mg or Cr, and x is atomic specific content of M with 0<x< / =4; the ferrite material is prepared by subjecting the high-purity powders of BaCO3, SrCO3, Fe2O3, Sc2O3, and MgO or Cr2O3 to matching, mixing, ball milling, drying, presintering, grinding, pressing and sintering according to the atomic molar ratio in the molecular formula of the ferrite material. The ferrite material herein has high purity and high resistivity, exhibits significant magnetocapacitance effect in the frequency range of 20 Hz to 2 MHz, the magnetocapacitance effect still tends to increase at 2 MHz, and the defect that existing single-phase magnetocapacitance material has weak indoor temperature magnetocapacitance effect and narrow frequency range is made up.

Description

technical field [0001] The invention relates to a material with magnetocapacitance effect, in particular to a ferrite material with room temperature broadband and large magnetocapacitance effect and a preparation method thereof. Background technique [0002] Magnetocapacitance effect (Magnetocapacitance effect) refers to the phenomenon that the capacitance or dielectric constant of the material changes under the external magnetic field. Materials with magnetocapacitive effects can have important applications in electromagnetic devices such as magnetic field detectors, smart filters, and magnetic field controllers. [0003] Materials with magnetocapacitive effects can be divided into single-phase materials and composite materials. Among them, single-phase materials were the first to be discovered, but so far, most single-phase materials (such as BiMnO 3 etc.) can only be more obvious under the condition of far lower than room temperature (about 100K), which is far from the ...

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Problems solved by technology

(Ni,Mn,Zn)Fe 2 o 4 It has a large magnetocapacitance effect near the low frequency and high frequency resonance point, but the magnetocapacitance effect in other frequency regions is small

Therefore, single-phase materials with large magnetocapacitance effect at room temperature and broadband characteristics have not been reported so far.

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