Preparation method of pure phase nanocrystalline yttrium doped bismuth ferrite

A technology of yttrium doping and bismuth ferrite, applied in nanotechnology, chemical instruments and methods, iron compounds, etc., can solve the problems of weak magnetism at room temperature and achieve low firing temperature

Inactive Publication Date: 2019-07-12
东北大学秦皇岛分校
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Problems solved by technology

[0004] On the other hand, due to the spatially modulated spin magnetic structure of bismuth ferrite itself, its own magnetic moments cancel each other out, resulting in weak room temperature magnetism, which limits its wide application.

Method used

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  • Preparation method of pure phase nanocrystalline yttrium doped bismuth ferrite
  • Preparation method of pure phase nanocrystalline yttrium doped bismuth ferrite
  • Preparation method of pure phase nanocrystalline yttrium doped bismuth ferrite

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Embodiment 1

[0021] Embodiment 1--doping amount 5% (doping amount refers to the amount of yttrium oxide instead of bismuth oxide)

[0022] A preparation method of pure-phase nanocrystalline yttrium-doped bismuth ferrite, the steps are as follows:

[0023] S1. Preparation of amorphous yttrium-doped bismuth ferrite by mechanical alloying method:

[0024] S1.1. In terms of molar ratio, according to iron oxide: bismuth oxide: yttrium oxide = 1: 0.855: 0.045, iron oxide, bismuth oxide and yttrium oxide were weighed and ground together to obtain a mixture;

[0025] S1.2. Put the above mixture into a planetary ball mill for high-energy ball milling according to the ball-to-material mass ratio of 20:1. Set the rotation speed of the main turntable at 350 rpm and the rotation speed of the planetary disk at 800 rpm. Control the ball milling time at 25 h, to obtain an intermediate product;

[0026] S2, high temperature heat treatment:

[0027] Under normal pressure and air atmosphere, the amorphous...

Embodiment 2

[0028] Embodiment 2--doping amount 10%

[0029] The difference from Example 1 is: iron oxide: bismuth oxide: yttrium oxide = 1:0.81:0.09, and the others are the same as in Example 1.

[0030] Comparative example 1--no doping

[0031] The difference from Example 1 is: iron oxide: bismuth oxide: yttrium oxide=1:0.9:0, and the others are the same as in Example 1.

[0032] The XRD pattern of embodiment 1-2 and comparative example 1 gained intermediate product is shown in figure 1 ,specifically, figure 1 (a) is the XRD pattern of iron oxide: bismuth oxide: yttrium oxide = 1:0.9:0 mixed powder in Comparative Example 1 after mechanical alloying for 25 hours, figure 1 (b) is the XRD pattern of iron oxide: bismuth oxide: yttrium oxide = 1:0.855:0.045 mixed powder in Example 1 after mechanical alloying for 25 hours, figure 1 (c) is the XRD pattern of the iron oxide: bismuth oxide: yttrium oxide = 1:0.81:0.09 mixed powder in Example 2 after mechanical alloying for 25 hours. From fi...

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Abstract

The invention belongs to the technical field of yttrium doped bismuth ferrite preparation, and discloses a preparation method of pure phase nanocrystalline yttrium doped bismuth ferrite. According tothe method, iron oxide, bismuth oxide and yttrium oxide are used as raw materials, the above raw materials are subjected to high-energy ball milling by a mechanical alloying method to obtain amorphousyttrium doped bismuth ferrite, and the amorphous yttrium doped bismuth ferrite is subjected to high-temperature heat treatment to produce the pure yttrium doped bismuth ferrite nanocrystalline structure. The yttrium doped bismuth ferrite prepared by the method has good multiferroic property and superior photo-catalytic effects.

Description

technical field [0001] The invention belongs to the technical field of preparation of yttrium-doped bismuth ferrite, and in particular relates to a preparation method of pure-phase nanocrystal yttrium-doped bismuth ferrite. Background technique [0002] Bismuth ferrite has a ferroelectric Curie point (TC=810°C) and an antiferromagnetic Neel point (TN=370°C) which are much higher than room temperature, so it has great applications in fields such as multiferroics and storage. space; in addition, BiFeO 3 The bandgap width is only 2.16eV, which makes BiFeO 3 Visible light can be directly used for photocatalytic process, which makes BiFeO 3 The application of materials in environmental governance and energy hydrogen production becomes possible. [0003] However, bismuth ferrite is often accompanied by Bi 2 Fe 4 o 9 、 Bi 25 FeO 40 and other heterogeneous phases, and BiFeO 3 The sintering temperature of the crystal form is narrow, thereby increasing the BiFeO 3 firing dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
CPCB82Y40/00C01G49/0018C01G49/0054C01P2002/72
Inventor 王冠琦王海旺李元铭吴正杰马源张煜垲胡鹏程魏新芳
Owner 东北大学秦皇岛分校
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