Bismuth ferrite based nano ceramic and preparation method

A technology of nano-ceramics and bismuth ferrite, which is applied in the field of preparation of non-polar non-metallic materials, can solve the problems of large leakage current, reduction of remanent polarization strength of bismuth ferrite ceramics, deterioration of ferroelectricity, etc., to reduce dielectric loss and leakage Current, improvement of ferromagnetism and ferroelectricity, effect of promoting orthorhombic phase

Inactive Publication Date: 2019-02-19
JIANGXI UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Although the prior art improves the ferromagnetism of bismuth ferrite ceramics, when the doping does not change its antiferromagnetic structure, the leakage current is large. At the same time, due to the doping

Method used

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  • Bismuth ferrite based nano ceramic and preparation method
  • Bismuth ferrite based nano ceramic and preparation method
  • Bismuth ferrite based nano ceramic and preparation method

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Example Embodiment

[0032] Example 1

[0033] This embodiment proposes bismuth ferrite-based nano-ceramics, the chemical formula of the main components is Bi 0.8 Gd 0.2 Fe 1- x Ti x O 3 , Where the value of x is Ti 4+ Doping ratio, x=0.05, Bi 0.8 Gd 0.2 Fe 1-x Ti x O 3 The phase is orthogonal.

[0034] The preparation method of the above bismuth ferrite-based nano-ceramics includes the following steps:

[0035] (1) Weigh the bismuth source, iron source, gadolinium source, and titanium source according to the molar ratio of the doping elements, mix them and dissolve them in an organic solvent, and configure them as a mixed solution with a concentration of 0.1 mol / L;

[0036] (2) Add additives to the mixed solution, the molar ratio of the additive to the mixed solution is 1:1, stir for 4 hours to obtain a sol;

[0037] (3) Dry the sol for 12 hours at a drying temperature of 120°C, and finely grind it to obtain nano powder;

[0038] (4) Filling the nano powder into the graphite mold, performing plasma sinterin...

Example Embodiment

[0052] Example 2

[0053] This embodiment is basically the same as the embodiment 1, the difference is that x=0.01, and the ratio of the orthogonal phase generated by the lattice mutation is 67.9%.

Example Embodiment

[0054] Example 3

[0055] This embodiment is basically the same as the embodiment 1, the difference is that x=0.1, and the ratio of the orthogonal phase generated by the lattice mutation is 76.4%.

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Abstract

The invention discloses bismuth ferrite based nano ceramic. A main composition of the nano ceramic is Bi0.8Gd0.2Fe1-xTixO3, wherein value of x is doping proportion of Ti4+, x is greater than or equalto 0.01 and smaller than or equal to 0.1, and phase of Bi0.8Gd0.2Fe1-xTixO3 is orthogonal phase. Spiral cycle of bismuth ferrite based ceramic is broken through, ferromagnetism and ferroelectricity ofthe bismuth ferrite based nano ceramic are improved, and dielectric loss and leaking current are reduced. The invention further discloses a preparation method of the bismuth ferrite based nano ceramic. The preparation method includes following steps: weighing a bismuth source, an iron source, a gadolinium source and a titanium source, mixing and dissolving in an organic solvent to preparing a mixed solution, adding an additive, and stirring to obtain sol; drying the sol, and finely grinding to obtain nano powder; filling a graphite die with the nano powder, performing plasma sintering, polishing and grinding to remove carbon paper on the surface, and annealing to obtain the bismuth ferrite based nano ceramic. By adopting plasma sintering, compactness of the bismuth ferrite based nano ceramic is improved, so that ferromagnetism is enhanced, and generation of the orthogonal phase in the bismuth ferrite based nano ceramic is promoted.

Description

technical field [0001] The invention relates to the technical field of preparation of electrodeless non-metallic materials, in particular to a bismuth ferrite-based nano-ceramic and a preparation method thereof. Background technique [0002] Bismuth ferrite (BiFeO 3 , BFO), is a twisted triangular perovskite structure, with high Curie temperature, Neel temperature and large remnant polarization temperature, in ferroelectric random access memory, spintronic devices, magnetoelectric memory units , optoelectronic devices and other fields have good application prospects. [0003] In bismuth ferrite, the Bi element is volatile at high temperature, and it is difficult to form a pure phase, and the Fe element is easily changed to produce Fe 2+ , resulting in electrons in the Fe 2+ / Fe 3+ The jump between them makes the dielectric loss of the system too large, and its own structure has an asymmetric helical structure with a period of 62nm, so the system reflects antiferromagneti...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2675C04B35/622C04B2235/3224C04B2235/3232C04B2235/3298
Inventor 田娅晖薛飞王蓓
Owner JIANGXI UNIV OF TECH
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