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Method for preparing pure-phase bismuth ferrite powder and block
The invention relates to a method for preparing pure-phase bismuth ferrite powder and a pure-phase bismuth ferrite block, in particular to a method for preparing the pure-phase bismuth ferrite powder and the pure-phase bismuth ferrite powder block by an improved solid phase reaction method, and relates to the technical field of preparation of inorganic nonmetallic materials. The pure-phase bismuth ferrite powder is obtained by the steps of weighing, ball milling, pressurizing, pre-sintering, pulverizing, washing, and drying; the pure-phase bismuth ferrite block is obtained by the steps of plasticizing and granulating, dry pressing, and sintering and blocking based on the steps of preparing the pure-phase bismuth ferrite powder. According to the method provided by the invention, the problem of iron excess caused by bismuth is solved by controlling the ratio of content of bismuth to iron; the content of Bi25FeO4O and the impurity are reduced by pressurizing and pre-sintering and controlling a temperature rising speed, a pre-sintering temperature and a heat preservation time; the Bi25FeO4O impurity is removed by reacting with dilute nitric acid and being washed with deionized water, and the BiFeO3 is prevented from being decomposed at a high temperature by controlling the temperature rising speed during the sintering, the sintering temperature and the heat preservation time to improve the hardness and compactness of the BiFeO3 block.
Method for preparing pure-phase bismuth ferrite powder and block
The invention relates to a method for preparing pure-phase bismuth ferrite powder and a pure-phase bismuth ferrite block, in particular to a method for preparing the pure-phase bismuth ferrite powder and the pure-phase bismuth ferrite powder block by an improved solid phase reaction method, and relates to the technical field of preparation of inorganic nonmetallic materials. The pure-phase bismuth ferrite powder is obtained by the steps of weighing, ball milling, pressurizing, pre-sintering, pulverizing, washing, and drying; the pure-phase bismuth ferrite block is obtained by the steps of plasticizing and granulating, dry pressing, and sintering and blocking based on the steps of preparing the pure-phase bismuth ferrite powder. According to the method provided by the invention, the problem of iron excess caused by bismuth is solved by controlling the ratio of content of bismuth to iron; the content of Bi25FeO4O and the impurity are reduced by pressurizing and pre-sintering and controlling a temperature rising speed, a pre-sintering temperature and a heat preservation time; the Bi25FeO4O impurity is removed by reacting with dilute nitric acid and being washed with deionized water, and the BiFeO3 is prevented from being decomposed at a high temperature by controlling the temperature rising speed during the sintering, the sintering temperature and the heat preservation time to improve the hardness and compactness of the BiFeO3 block.
Method for preparing pure-phase bismuth ferrite powder and block
LIN FANGTING (author) / LIAO LIMING (author) / ZHANG ZHENGJIAN (author) / DENG LINYAN (author) / WANG QING (author) / LIU AIYUN (author) / SHI WANGZHOU (author)
2015-04-29
Patent
Electronic Resource
English
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