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Highly-densified ferroelectric ceramic having morphotropic crystal phase structure and preparation method of ferroelectric ceramic

A ferroelectric ceramic and densification technology, applied in the field of highly densified ferroelectric ceramics and their preparation, can solve the problems of low densification, small polarization, and difficulty in realizing magnetoelectric coupling of polycrystalline Small particle size, improved ferroelectric polarization, high densification promotion effect

Pending Publication Date: 2019-05-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of low densification, small polarization and difficult magnetoelectric coupling in the preparation of polycrystalline multiferroic ceramics by existing methods, and provides highly dense ferroelectric ceramics with quasi-isomorphic crystal phase structure and its preparation method

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  • Highly-densified ferroelectric ceramic having morphotropic crystal phase structure and preparation method of ferroelectric ceramic
  • Highly-densified ferroelectric ceramic having morphotropic crystal phase structure and preparation method of ferroelectric ceramic
  • Highly-densified ferroelectric ceramic having morphotropic crystal phase structure and preparation method of ferroelectric ceramic

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specific Embodiment approach 1

[0036] Specific Embodiment 1: The general composition formula of the high-densification ferroelectric ceramics with quasi-isomorphic crystal phase structure in this embodiment is: Bi 1-x R x Fe 1-y B y o 3 , where R is neodymium, erbium, lanthanum, samarium, europium, gadolinium, dysprosium or holmium, and B is titanium or tantalum; 0<x≤0.4, 0<y≤0.1, x, y is mole fraction.

specific Embodiment approach 2

[0037] Specific embodiment two: the preparation method of the high-densification ferroelectric ceramics with quasi-isomorphic crystal phase structure in this embodiment includes the following steps:

[0038] 1. Bi 1-x R x Fe 1-y B y o 3 Preparation of pure phase powder:

[0039] ①According to the chemical formula Bi 1-x R x Fe 1-y B y o 3 , wherein 0<x≤0.4, 0<y≤0.1, take bismuth salt, R salt, iron salt and B salt according to the ratio of the amount of substance of (1-x):x:(1-y):y, A group of bismuth salt and R salt and a group of iron salt were dissolved in glacial acetic acid, heated and stirred until the salt was completely dissolved, cooled to room temperature, ethylene glycol was added respectively, and stirring was continued to obtain bismuth salt / R Salt solution and iron salt solution, wherein Bi is weighed in excess of 1% to 10% by molar ratio (because the Bi element is volatile, it needs to be in excess);

[0040] Slowly add ethylene glycol dropwise to the ...

specific Embodiment approach 3

[0052] Embodiment 3: This embodiment differs from Embodiment 2 in that all chemical reagents in step 1 are above analytical purity. Others are the same as in the second embodiment.

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Abstract

The invention provides a highly-densified ferroelectric ceramic having a morphotropic crystal phase structure and a preparation method of the ferroelectric ceramic, and relates to the highly-densifiedferroelectric ceramic and the preparation method thereof. The invention aims to solve the problem that a polycrystalline multiferroic ceramic prepared by a current method has low densification, smallpolarization, and difficulty in magnetoelectric coupling. The highly-densified ferroelectric ceramic has a general formula of Bi1-xRxFe1-yByO3. The preparation method comprises the following steps: 1, preparing pure-phase powder of Bi1-xRxFe1-yByO3; 2, grinding the ceramic powder, and performing granulation to obtain granulated powder; 3, drying the granulated powder, performing pre-pressing forming, discharging an adhesive, and preparing a ceramic green body; and 4, preparing the Bi1-xRxFe1-yByO3 ceramic block. The ferroelectric ceramic provided by the invention has a fine crystal grain size, a relative density of 95%-97%, and uniform three phase structures including a ferroelectric structure, an antiferroelectric structure and a paraelectric structure; the ferroelectric polarization ofthe ceramic is significantly improved; and the ceramic is applied to the field of ferroelectric ceramics.

Description

technical field [0001] The invention relates to a high-density ferroelectric ceramic and a preparation method thereof. Background technique [0002] Bismuth ferrite (BiFeO 3 ) has ferroelectricity and weak ferromagnetism at the same time. It is the only single-phase multiferroic material at room temperature, and its single crystal spontaneous polarization value exceeds 90μC / cm 2 , has a very large application potential based on the magnetoelectric coupling effect. And using this magnetoelectric effect can make high-density memory, magnetoelectric transducer, magnetoelectric sensor, new magnetron electronic control device, etc., which provides a greater degree of freedom for the development of new multifunctional devices. But BiFeO 3 The G-type antiferromagnetic structure itself has a magnetic helical period, which determines that its magnetism is very weak; BiFeO 3 The symmetry of the R3c crystal determines that its polarization is difficult to reverse; in addition, BiFe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/475C04B35/495
Inventor 柯华张利伟张洪军李方喆罗蕙佳代曹璐
Owner HARBIN INST OF TECH