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Preparation method for substituting fluorine for oxygen in bismuth ferrite crystal lattices

A bismuth ferrite, lattice technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of insufficient anion doping preparation process, and achieve the effect of ferromagnetism enhancement and magnetoelectric coupling.

Inactive Publication Date: 2012-01-18
NANJING UNIV
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  • Abstract
  • Description
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Problems solved by technology

It has been richly doped with cations. The international literature published in recent years includes: 1) Current Applied Physics 11 (2011) 508-512; 2) J Mater Sci: Mater Electron (2011) 22: 323-327; 3) Applied Physics Letters 98 (2011) 072901; 4) Physical Review B 83 (2011) 054406. Although cation doping has achieved fruitful results, the work of anion doping has not been carried out in the international and domestic scope, which is mainly due to The preparation process of anion doping is not perfect, and the anions cannot effectively enter the lattice.

Method used

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  • Preparation method for substituting fluorine for oxygen in bismuth ferrite crystal lattices
  • Preparation method for substituting fluorine for oxygen in bismuth ferrite crystal lattices
  • Preparation method for substituting fluorine for oxygen in bismuth ferrite crystal lattices

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Effect test

Embodiment 1

[0017] Embodiment 1: the content of synthetic F is the sample of 0.25 (structural formula)

[0018] Attached figure 1 The preparation process shown, the synthesis of BiFeO with F content of 0.25 2.75 f 0.25 sample. Its synthetic steps are:

[0019] a) Use a vessel made of corrosion-resistant materials as a container. First prepare a dilute acid solution, take a 200ml beaker, and measure 100ml of the dilute acid solution. Weigh the Bi salt (Bi(NO 3 ) 3 ·5H 2 O) and Fe salts (Fe(NO 3 ) 3 9H 2 O) Add it into the dilute acid solution, stir well to make it dissolve completely, and mix evenly.

[0020] b) One beaker, one drip irrigation, one AL104 Mettler Toledo electronic balance. Weigh the stoichiometric F-containing salt (HF), add it into the solution prepared in a), and stir well to make it evenly mixed.

[0021] c) Weigh an appropriate amount of citric acid and add it to the solution prepared in b), stir fully to dissolve it completely, and mix evenly.

[0022] d) ...

Embodiment 2

[0028] Embodiment 2: the content of synthetic F is the sample of 0.2 (structural formula)

[0029] Attached figure 1 The preparation process shown, the synthesis of BiFeO with F doping amount of 0.2 2.8 f 0.2 sample. Its synthesis steps are the same as those in Example 1.

[0030] After the sample preparation was completed, in order to detect the quality of the sample, we performed X-ray diffraction (X-ray diffraction, XRD) analysis, and its XRD pattern is as attached figure 2 Shown in x=0.2. The XRD results show that the phase formation degree of the sample is very good. In order to detect whether F effectively enters the bismuth ferrite lattice, its performance is significantly enhanced, and its hysteresis loop at room temperature is measured, as shown in the attached Figure 5 Shown in X=0.2. The results show that: after F enters the bismuth ferrite lattice effectively, it exhibits obvious ferromagnetism.

Embodiment 3

[0031] Embodiment 3: the content of synthesizing F is the sample of 0.15

[0032] Attached figure 1 The preparation process shown, the synthesis of BiFeO with a F content of 0.15 2.85 f 0.15 sample. Its synthesis steps are the same as those in Example 1.

[0033] After the sample preparation was completed, in order to detect the quality of the sample, we performed X-ray diffraction (X-ray diffraction, XRD) analysis, and its XRD pattern is as attached figure 2 Shown in x=0.15. The XRD results show that the phase formation degree of the sample is very good. In order to detect whether F effectively enters the bismuth ferrite lattice, its performance is significantly enhanced, and its hysteresis loop at room temperature is measured, as shown in the attached Figure 5 Shown in X=0.15. The results show that: after F enters the bismuth ferrite lattice effectively, it exhibits obvious ferromagnetism.

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Abstract

The invention discloses a preparation method for substituting fluorine for oxygen in bismuth ferrite crystal lattices. The method comprises the following steps of: 1, selecting a utensil made of anticorrosive material as a container, selecting diluted acid as a solvent, weighing nitride of Bi and nitride of Fe in a stoichiometric ratio, adding the nitrides into the solvent in a molar ratio of 1:1, preparing a proper amount of fluorine-containing salt, and adding citric acid into the solution; 2, performing initial reaction on the prepared solution in a water bath for (2.5+ / -0.5) hours with uniform stirring, and drying the reaction product in an oven to obtain powder; and 3, performing decomposition reaction on the obtained powder at the high temperature of 780+ / -15 DEG C for 30+ / -3 minutes, removing impurities, sheeting the decomposed powder, sintering the powder at the high temperature of 810+ / -15 DEG C for 10+ / -2 minutes, and thus obtaining a sample in which F-1 effectively enters BFO crystal lattices. The sample in which the fluorine effectively enters the bismuth ferrite crystal lattices and substitutes the oxygen has ferro-electricity and ferromagnetism, and the other path isprovided for realizing the development of multifunctional electronic devices.

Description

1. Technical field [0001] The invention belongs to the field of new functional materials, especially the preparation method of fluorine replacing oxygen in bismuth ferrite lattice. 2. Background technology [0002] With the rapid development of science and technology, people have higher and higher requirements for the multifunctionality and miniaturization of devices, which requires the development of new materials with two or more functions at the same time, in order to develop materials that can simultaneously realize multiple functions. new device. Multiferroic materials are one of the research hotspots of functional materials in recent years. Multiferroic materials refer to the system in which ferromagnetic order, ferroelectric order and ferroelastic order exist simultaneously in a certain temperature range. Since various physical effects are in the same system, they will inevitably interact with each other, so as to realize the mutual regulation between different func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
Inventor 胡艳春吴小山
Owner NANJING UNIV
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