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Sodium bismuth titanate based lead-free piezoelectric ferroelectric material with low dielectric property and low loss

A bismuth sodium titanate-based, low-loss technology is applied in the field of bismuth sodium titanate-based lead-free piezoelectric ferroelectric ceramic materials and perovskite piezoelectric ceramic materials. The effect of low power loss and various performance improvements

Inactive Publication Date: 2016-06-22
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Materials with excessive loss are used in high-frequency, filter and other communication aspects, which have an important i

Method used

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  • Sodium bismuth titanate based lead-free piezoelectric ferroelectric material with low dielectric property and low loss
  • Sodium bismuth titanate based lead-free piezoelectric ferroelectric material with low dielectric property and low loss
  • Sodium bismuth titanate based lead-free piezoelectric ferroelectric material with low dielectric property and low loss

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Experimental program
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Embodiment

[0032] Embodiment one: NaBiTi 6 o 14 Piezoelectric ceramic preparation

[0033] Chemical formula:

[0034] Using Na 2 CO 3 , TiO 2 and Bi 2 o 3 The three kinds of raw material powders are weighed according to the general chemical formula, and the reactants are cooled to room temperature in a desiccator for drying treatment, and Na 2 CO 3 The mass is 2.0775g, TiO 2 Mass is 18.78894g, Bi 2 o 3 The mass is 9.1335g, and the sample is processed and prepared by traditional solid phase method. The specific procedure was as follows: the powders were mixed in ethanol and ball milled with stabilized zirconia grind for 24 hours and dried. The dried powder was calcined twice at 900°C and 950°C for 4 hours. After each calcining, the powder was ball-milled for 12 hours, and then the powder was re-ground and shaped into granules, and the green body was used to The uniaxial steel mold is pressed into a sheet, pressed into a disc size (area 0.6981cm, diameter 0.943cm, thickness ...

Embodiment 2

[0038] Embodiment two: the dielectric property measurement of two component piezoelectric ceramic material samples

[0039] (1) from figure 1 Diffraction analysis shows that the ceramic sheets obtained by the experimental reaction are single-phase except for 1100 °C, which is consistent with the theoretical material.

[0040] (2) Relative permittivity measurement data

[0041] figure 2 Said that NaBiTi 6 o 14 Pre-fired twice at 900°C and 950°C, and calcined at 1020°C, the measured relative permittivity varies with the temperature of the material environment. The relative permittivity of the ceramic rises and then falls at lower temperatures, and then after In the smooth zone, the Curie point Tc=375°C increases sharply. At high temperature (about 650°C), the dielectric constant tends to decrease. At 1MHz, the relative permittivity has a minimum value of 22.3962. As the frequency increases, the relative permittivity of the ceramic material decreases.

[0042] image 3 S...

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Abstract

The invention discloses a sodium bismuth titanate based lead-free piezoelectric ferroelectric material with a low dielectric property and low loss and a preparing method.The chemical general formula of the sodium bismuth titanate based lead-free piezoelectric ferroelectric material is NaBiTi6O14, and the sodium bismuth titanate based lead-free piezoelectric ferroelectric material is formed through two times of presintering and one time of sintering with a traditional solid phase method.It is detected that according to ceramic chips prepared with the method, the dielectric constant has strong stability, and when the intrinsic sintering temperature is 1020 DEG C, the dielectric constant is as low as 22.3962-22.9918 within the temperature range of 68.6-293.6 DEG C, the corresponding loss value is reduced by a few of order of magnitudes compared with common Na0.5Bi0.5TiO3(NBT), the lowest loss value can even reach 4.9*10<-4> which cannot be reached by many ferroelectric, piezoelectric and medium materials and microwave ceramic materials with medium dielectric constants, and the dielectric constant is increased to some extent.Compared with other ceramic materials, the material based on NBT ceramic can be widely applied to ferroelectric, piezoelectric and medium materials and microwave ceramic materials with medium dielectric constants due to the advantages of the high-stability dielectric constant with a wide temperature range and extremely low dielectric loss.

Description

technical field [0001] The invention belongs to the technical field of ceramic element preparation, in particular to a bismuth sodium titanate-based lead-free piezoelectric ferroelectric ceramic material with low dielectric properties, which is a new type of perovskite with low dielectric constant and low dielectric loss The piezoelectric ceramic materials of the mine have broad application prospects in ceramic substrates of integrated circuits, medium-dielectric microwave ceramics, information transmission between high-frequency devices, and ferroelectric materials. Background technique [0002] Ferroelectric and piezoelectric materials are information functional materials. Widely used in electronic information, integrated circuits, computers and other scientific and technological fields, it is the basic material of many new electronic components. The development of integrated circuits has been in a certain bottleneck area, and actively seeks edge innovation. Under the bac...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/64
CPCC04B35/475C04B35/64C04B2235/3201C04B2235/3232C04B2235/3298C04B2235/656C04B2235/96
Inventor 陈勇周子童杨书琴梁雄伟曹万强周超李璋
Owner HUBEI UNIV