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A novel ternary ferroelectric ceramic system with high Curie temperature and its preparation method and application

A high-temperature sintering and voltage-electric technology, applied in the field of functional materials, can solve the problems of limited application and low Curie temperature, and achieve the effects of uniform particle size, high Curie temperature and broad application prospects

Active Publication Date: 2020-02-21
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, lead niobate-lead titanate has good electrical properties in the MPB region, but its low Curie temperature limits its application at high temperatures

Method used

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  • A novel ternary ferroelectric ceramic system with high Curie temperature and its preparation method and application
  • A novel ternary ferroelectric ceramic system with high Curie temperature and its preparation method and application
  • A novel ternary ferroelectric ceramic system with high Curie temperature and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: adopt solid phase synthesis method to prepare the pottery with following structural formula:

[0053] xPb(In 1 / 2 Nb 1 / 2 )O 3 -yPb(Ni 1 / 3 Nb 2 / 3 )O 3 -(1-x-y)PbTiO 3 (x=0.30, y=0.31, 0.33, 0.35 and 0.37).

[0054] (1) The initial raw material In 2 o 3 , Nb 2 o 5 and NiO as InNbO 4 and NiNb 2 o 6 The stoichiometric ratio of the molecular formula is weighed and mixed and ground, and the precursor InNbO is synthesized by sintering at 900°C for 4 hours and 1000°C for 6 hours in a high-temperature sintering furnace. 4 and NiNb 2 o 6 .

[0055] (2) The synthesized precursor InNbO 4 and NiNb 2 o 6 Grind into powder with PbO, TiO 2 According to xPb(In 1 / 2 Nb 1 / 2 )O 3 -yPb(Ni 1 / 3 Nb 2 / 3 )O 3 -(1-x-y)PbTiO 3 (x=0.30, y=0.31, 0.33, 0.35 and 0.37) the stoichiometric ratio of the molecular formula is weighed, and the method of taking PbO excess 4mol% to make up for the loss caused by PbO volatilization, adding alcohol and mixing for two hours,...

Embodiment 2

[0058] Example 2: Determination of the structure of the ceramic prepared in Example 1.

[0059] Using X-ray powder diffraction (XRD), the structure of the ceramics was determined. The instrument used is a Japanese RIGAKU-MinFlex II powder diffractometer (Cu target, λ=0.154056nm, graphite monochromator), the specific test conditions are at room temperature, the measurement angle range is 10-80 °, and the step size adopted is 0.02 ° ( 2θ), the time is 2s per step. The obtained powder diffraction results are as follows figure 1 shown.

[0060] From figure 1 It can be seen that the prepared ceramics are all pure perovskite structures without pyrochlore phase. For xPb(In 1 / 2 Nb 1 / 2 )O 3 -yPb(Ni 1 / 3 Nb 2 / 3 )O 3 -(1-x-y)PbTiO 3 (x=0.30, y=0.31, 0.33, 0.35 and 0.37) ceramics, with the increase of PT content, the ternary system changes from a trigonal perovskite phase structure to a tetragonal perovskite phase structure; where, when x=0.30 , when y=0.31, the ternary syste...

Embodiment 3

[0061] Example 3: Measurement of the electrical properties of the ceramics prepared in Example 1.

[0062] a) The ceramics are sliced, thinned, polished, and coated with silver glue on both sides for the measurement of electrical properties.

[0063] b) Measurement of dielectric properties: the instrument used is an alpha dielectric / impedance high-resolution analyzer (Novolcontrol, German), with a temperature range of 30 to 500 °C and a frequency range of 10 to 10 3 Hz, small signal test voltage 0.5Vrms.

[0064] c) Measurement of ferroelectricity: the instrument used is aix-ACCT-TF 2000 standard ferroelectric measurement system, the temperature condition is room temperature, and the applied frequency is 2Hz.

[0065] d) Measurement of piezoelectricity: the instrument used is ZJ-4AN quasi-static d 33 Measuring instrument.

[0066] Specific measurement results such as figure 2 , image 3 , Figure 4 and shown in Table 1, wherein Table 1 provides the physical parameters o...

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Abstract

The invention discloses a ternary ferroelectric piezoelectric material as well as a preparation method and application thereof. The chemical composition of the material is: xPb(In1 / 2Nb1 / 2)O(3-y)Pb(Ni1 / 3Nb2 / 3)O(3-(1-x-y)PbTiO3, where x=0.17-0.43, and y=0.09-0.53; and the material is of a perovskite type structure. In the preparation method of the ceramic material, a solid-phase synthesis technologyis adopted; by adopting the method, a pure perovskite phase can be prepared successfully, and the pyrochlore structure generated by a one-step synthesis process is avoided; and moreover, the ceramicprepared by the method has uniform particle size and high density. The system is determined as a perovskite type structure through X-ray powder diffraction; according to an electrical test, the systemhas excellent ferroelectricity, dielectricity and piezoelectric property as well as relatively high Curie temperature, and has an application prospect in terms of piezoelectric sensors, memories andhigh-performance capacitors.

Description

technical field [0001] The invention relates to a ternary ferroelectric piezoelectric ceramic material. Specifically, the present invention relates to a ternary ceramic with high Curie temperature, ferroelectricity and piezoelectricity, and its synthesis process, belonging to the field of functional materials science. Background technique [0002] Perovskite is named after the Russian geologist Perovski, which originated from the compound CaTiO in perovskite 3 . The general structural formula of perovskite is ABO 3 , where A represents +1 valence, +2 valence or +3 valence cation (such as K + 、Na + , Ca 2+ 、Ba 2+ 、Sr 2+ , Pb 2+ , La 3+ 、 Bi 3+ ), B stands for +4 valence, +5 valence or +6 valence cation (such as Ti 4+ 、Zr 4+ , Nb 5+ 、 Ta 5+ , W 6+ 、Mo 6+ ). The ideal perovskite structure belongs to the cubic crystal system, and the space group is Pm3m. The A atom is at the top corner, the B atom is at the body center, and the O atom is at the face center, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/499C04B35/472C04B35/622
CPCC04B35/472C04B35/499C04B35/622C04B2235/3232C04B2235/3279C04B2235/3286C04B2235/3296
Inventor 龙西法乔显集李修芝王祖建刘颖
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI