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Preparation method of single pure-phase bismuth ferrite material based on ionic compensation

A technology of bismuth ferrite and ions, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve problems such as segregation, volatile components of bismuth oxide, etc., achieve no impurity introduction, clear cubic crystal structure, and good stability Effect

Inactive Publication Date: 2015-10-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention uses bismuth oxide and iron oxide as raw materials, adopts three-step sintering and two-time ion compensation to prepare bismuth ferrite material, in order to solve the technical problem that bismuth oxide is volatile and causes component segregation in the process of preparing bismuth ferrite, and the preparation is obtained Single pure phase bismuth ferrite material

Method used

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  • Preparation method of single pure-phase bismuth ferrite material based on ionic compensation
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  • Preparation method of single pure-phase bismuth ferrite material based on ionic compensation

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Embodiment 1

[0030] A preparation method of a single pure phase bismuth ferrite material, specifically comprising the following steps:

[0031] Step 1: Using bismuth oxide and iron oxide as raw materials, according to BiFeO 3 The proportion of metal elements in the mixture is converted into the mass percentage of bismuth oxide and iron oxide, and the materials are weighed and mixed, and then deionized water is used as the grinding medium, and wet ball milled in a planetary ball mill for 18 hours, so that the raw materials are fully mixed and evenly obtained. The mixed powder after ball milling; wherein, the rotating speed of the ball mill is 220 rpm, and the direction is alternated once every 1 hour;

[0032]Step 2: Dry the mixed powder obtained in step 1 after primary ball milling in a blast drying oven at 90°C to obtain a dried powder; then put the dried powder into a sintering furnace for the first Pre-sintering, the pre-sintering temperature is 700°C, the time is 1.5h, and the heating...

Embodiment 2

[0039] A preparation method of a single pure phase bismuth ferrite material, specifically comprising the following steps:

[0040] Step 1: Using bismuth oxide and iron oxide as raw materials, according to BiFeO 3 The proportion of metal elements in the mixture is converted into the mass percentage of bismuth oxide and iron oxide, and the materials are weighed and mixed, and then deionized water is used as the grinding medium, and wet ball milled in a planetary ball mill for 18 hours, so that the raw materials are fully mixed and evenly obtained. The mixed powder after ball milling; wherein, the rotating speed of the ball mill is 220 rpm, and the direction is alternated once every 1 hour;

[0041] Step 2: Dry the mixed powder obtained in step 1 after primary ball milling in a blast drying oven at 100°C to obtain a dried powder; then put the dried powder into a sintering furnace for the first Pre-sintering, the pre-sintering temperature is 700°C, the time is 1.5h, and the heati...

Embodiment 3

[0048] A preparation method of a single pure phase bismuth ferrite material, specifically comprising the following steps:

[0049] Step 1: Using bismuth oxide and iron oxide as raw materials, according to BiFeO 3 The proportion of metal elements in the mixture is converted into the mass percentage of bismuth oxide and iron oxide, and the materials are weighed and mixed, and then deionized water is used as the grinding medium, and wet ball milled in a planetary ball mill for 18 hours, so that the raw materials are fully mixed and evenly obtained. The mixed powder after ball milling; wherein, the rotating speed of the ball mill is 220 rpm, and the direction is alternated once every 1 hour;

[0050] Step 2: Dry the mixed powder obtained in step 1 after primary ball milling in a blast drying oven at 100°C to obtain a dried powder; then put the dried powder into a sintering furnace for the first Pre-sintering, the pre-sintering temperature is 700°C, the time is 1.5h, and the heati...

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Abstract

The invention provides a preparation method of a single pure-phase bismuth ferrite material based on ionic compensation, which belongs to the field of ceramic material preparation. Firstly, a bismuth ferrite ceramic reaction mixture is prepared and then is dried for presintering for the first time; then 0.3 to 0.7wt percent of bismuth oxide is added through secondary ball milling for ionic compensation, and drying is performed for presintering for the second time; 0.2 to 0.4wt percent of bismuth oxide is added through third ball milling for ionic compensation, drying is performed for presintering for 0.5 to 1.5 h at 810 to 835 DEG C, and natural cooling is performed to room temperature along with a furnace, so as to obtain the single pure-phase bismuth ferrite material. According to the preparation method, the bismuth oxide and ferric oxide are used as raw materials, and three-step sintering and twice ionic compensation are adopted to prepare the single pure-phase bismuth ferrite material, so as to solve the technical problem of composition segregation caused by volatile bismuth oxide in the preparation process of bismuth ferrite and prepare the single pure-phase bismuth ferrite material.

Description

technical field [0001] The invention relates to the field of preparation of ceramic materials, in particular to a method for preparing a single pure-phase bismuth ferrite material based on ion compensation. Background technique [0002] Bismuth ferrite BiFeO 3 (BFO) is a typical multiferroic material with a high Curie transition temperature (T c =1103K) and Neel transition temperature (T N =643K), is one of the very few single-phase multiferroic materials that have both ferroelectricity and weak ferromagnetism at room temperature. As early as the 1960s, people have successfully prepared bismuth ferrite BiFeO 3 (BFO) powder material, but the temperature range for forming a single phase of BFO is quite narrow, and it is easy to generate heterogeneous phases, so the preparation and research of BFO powder with a single phase is a long-term and slow process. When preparing bismuth ferrite materials, it is easy to generate impurity phases because: Bi element is volatile, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 李颉张怀武廖宇龙李强李元勋马国坤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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