Novel Mg-doped NBT (Na0.5Bi0.5TiO3)-based lead-free dielectric ceramic material and preparation method thereof

A bismuth sodium titanate-based, dielectric ceramic technology, which is applied in the field of ceramics, can solve problems such as not being able to meet big data, and achieve low dielectric constant, low dielectric loss, and various performance improvements.

Inactive Publication Date: 2016-01-27
HUBEI UNIV
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  • Abstract
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  • Application Information

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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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  • Novel Mg-doped NBT (Na0.5Bi0.5TiO3)-based lead-free dielectric ceramic material and preparation method thereof
  • Novel Mg-doped NBT (Na0.5Bi0.5TiO3)-based lead-free dielectric ceramic material and preparation method thereof
  • Novel Mg-doped NBT (Na0.5Bi0.5TiO3)-based lead-free dielectric ceramic material and preparation method thereof

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Experimental program
Comparison scheme
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Embodiment

[0032] Embodiment one: NaBi (Ti 0.98 Mg 0.02 ) 6 o 14 Piezoelectric ceramic preparation

[0033] Chemical formula:

[0034] Using Na 2 CO 3 , TiO 2 and Bi 2 o 3 Three kinds of raw material powders, the reactants are cooled to room temperature in a desiccator, and dried, and Na 2 CO 3 The mass is 2.10856g, TiO 2 The mass is 18.62653g, Bi 2 o 3 The mass is 9.07311g, and the mass of MgO is 0.19179g. 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 A uniaxial steel mold is pressed into a sheet, pressed into a disc size (area 0.6951cm, diameter 0.941cm, thickness 0.168cm) and cold is...

Embodiment 2

[0039] Embodiment two: measure the dielectric properties of the piezoelectric ceramic material sample of the present invention

[0040] (1) from figure 1 Diffraction analysis shows that the ceramic sheet obtained by the experimental reaction is a single phase, which is consistent with the theoretical material, except that the sintering temperature is 1100 ° C.

[0041] (2) Relative permittivity measurement data

[0042] figure 2 Indicates that NaBi(Ti 0.98 Mg 0.02 ) 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 Flat zone, then moderate rise. As the frequency increases, its relative permittivity decreases.

[0043] image 3 Indicates that NaBi(Ti 0.98 Mg 0.02 ) 6 o 14 Pre-fired twice at 900°C and 950°C, and calcined at 1040°C, the measured relative dielec...

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Abstract

The invention discloses a novel Mg-doped NBT (Na0.5Bi0.5TiO3)-based lead-free dielectric material and a preparation method. The material has the general chemical formula of NaBi(Ti0.98Mg0.02)6O14, five temperature points are divided with a conventional solid-state method, and the material is formed by two times of pre-sintering and one time of sintering. A prepared ceramic wafer is detected to have the very strong stable dielectric constant, when the sintering temperature is 1060 DEG C, the dielectric constant is as low as 25.804-26.9894 in the ambient temperature range of 43.7 DEG C-414.1 DEG C, the corresponding loss value is also several magnitude orders lower than that of ordinary NBT (approximately 0.01) and can be as low as 2.6*10<-5>, the wafer has the lower dielectric loss when compared with microwave ceramic with middle dielectric constants, and the wafer has the lower dielectric constant and the lower dielectric loss when compared with ferroelectric materials. The material can be widely applied to ferroelectric and dielectric materials, PCB substrate materials and microwave ceramic materials with the middle dielectric constants due to the advantages of highly stable dielectric constant and extremely low dielectric loss in the wide temperature range of the material.

Description

technical field [0001] The invention belongs to the technical field of ceramic element preparation, in particular to a magnesium-doped novel bismuth sodium titanate-based lead-free piezoelectric ceramic material with high stability and low dielectric loss, which is a new type of low dielectric constant, extremely Perovskite piezoelectric ceramic materials with low dielectric loss have broad application prospects in PCB ceramic substrates of integrated circuits, information transmission between high-frequency devices, medium-dielectric microwave ceramics, and ferroelectric materials. Background technique [0002] Ferroelectric and piezoelectric ceramic materials are a kind of 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. In the context of the development of the electronics industry with a large ecology and a larg...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622
Inventor 陈勇杨书琴梁雄伟曹万强周超李璋
Owner HUBEI UNIV
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