Preparation method of high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic

A composite ceramic and densification technology, applied in the field of composite ceramic preparation, can solve the problems of low densification and large leakage current of composite ceramics

Active Publication Date: 2016-05-25
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the traditional method to prepare multiferroic (1-y) BiFeO 3 -yBi 1-x R x FeO 3 The problem of low densification and large leakage current of composite ceramics provides a highly densified multiferroic (1-y)BiFeO 3 -yBi 1-x R x FeO 3 Preparation method of composite ceramics

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  • Preparation method of high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic
  • Preparation method of high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic
  • Preparation method of high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic

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specific Embodiment approach 1

[0036] Specific implementation mode 1: Highly densified multiferroic (1-y) BiFeO in this implementation mode 3 -yBi 1-x R x FeO 3 The preparation method of composite ceramics is carried out in the following steps:

[0037] 1. BiFeO 3 Preparation of pure phase powder:

[0038] ① According to BiFeO 3 Ceramic chemical formula, weigh bismuth salt and iron salt according to the stoichiometric ratio, dissolve them in 1-3mol / L nitric acid solution respectively, and stir for 30 minutes to obtain bismuth salt solution and iron salt solution, in which the excess of Bi is 1%-10%;② Pour the bismuth salt solution into the iron salt solution and stir for 2-3 hours to obtain the bismuth-iron solution; ③Titrate the bismuth-iron solution and 2.5mol / L ammonia water into the pre-precipitation environment together, and the titration rate is 45-55 drops / minutes, the pre-precipitation environment is ammonia water with a pH value of 8-12; ④ Stir the obtained precipitate for 1-3 hours, then le...

specific Embodiment approach 2

[0051] Embodiment 2: This embodiment differs from Embodiment 1 in that: the bismuth salt described in step ① is bismuth nitrate or bismuth subnitrate, and the iron salt is iron nitrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0052] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the stirring speed in Step 1 and Step 2 is both 150-300 r / min. Others are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method of high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic, and relates to a preparation method of composite ceramic. The problems that high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic prepared through a traditional method is low in densification and large in leakage current are solved. The method comprises the steps that 1, BiFeO3 pure phase powder is prepared; 2, Bi[1-x]RxFeO3 pure phase powder is prepared; 3, (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic powder is prepared; 4, ball mill mixing is conducted; 5, ball mill mixed powder is dried, ground and granulated; 6, cold isostatic pressing treatment is conducted on sieved powder, and dumping is conducted; 7, a (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic block is prepared; 8 the ceramic block obtained in the seventh step is polished with sand paper, ground, granulated and dumped; 9, a dumped ceramic blank obtained in the eighth step is subjected to secondary sintering, and the composite ceramic is obtained. The preparation method of the high-densification multiferroic (1-y)BiFeO[3-y]Bi[1-x]RxFeO3 composite ceramic is used for the field of composite ceramic.

Description

technical field [0001] The invention relates to a preparation method of composite ceramics. Background technique [0002] Bismuth layered perovskite structure BiFeO 3 It is one of the few single-phase multiferroic materials that has both ferroelectricity and antiferromagnetism, because of its high Curie temperature (Tc ~ 830 ° C), antiferromagnetic Neel temperature ( T N ~370℃) and high spontaneous polarization (~100μC cm -2 ) and become the preferred magnetoelectric material that can be applied at room temperature. Moreover, this mutual regulation of magnetism and electricity has a very good application prospect in devices such as converters, oscillators, memories, especially multi-state memories. But BiFeO 3 There are certain defects and difficulties to overcome, such as the inability to show a good magnetoelectric coupling effect at room temperature, and there are heterogeneous phases in the synthesis process, especially BiFeO 3 The problem of leakage current has al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622C04B35/626
CPCC04B35/2675C04B35/622C04B35/626C04B35/6261C04B35/62675C04B35/62695C04B2235/3224C04B2235/3227C04B2235/3229C04B2235/3298C04B2235/612C04B2235/77
Inventor 柯华张利伟张洪军王猛罗蕙佳代应鹏展
Owner HARBIN INST OF TECH
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