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A high d33 lead-free strontium niobate calcium sodium tungsten bronze piezoelectric ferroelectric ceramic material and its preparation method

A lead-free strontium calcium sodium tungsten tungsten bronze and ferroelectric ceramic technology is applied in the field of electronic ceramic materials, which can solve the problems of reducing the density and deteriorating the sintering behavior, and achieves the reduction of the coercive field, the enhancement of relaxivity, and the improvement of iron. The effect of electrical properties

Inactive Publication Date: 2018-07-10
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the growth habit of tungsten bronze itself in the high-temperature sintering process of tungsten bronze structure lead-free niobate materials, its growth rate in the (001) direction is fast, and it is easy to produce anisotropic rod-shaped crystals, which deteriorates the sintering behavior and reduces Density

Method used

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  • A high d33 lead-free strontium niobate calcium sodium tungsten bronze piezoelectric ferroelectric ceramic material and its preparation method
  • A high d33 lead-free strontium niobate calcium sodium tungsten bronze piezoelectric ferroelectric ceramic material and its preparation method
  • A high d33 lead-free strontium niobate calcium sodium tungsten bronze piezoelectric ferroelectric ceramic material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Ingredients

[0037] According to Sr 1.85 Ca 0.15 NaNb 5 o 15 +0.10wt.%Bi 2 o 3 The stoichiometric ratio, weigh the raw material Na 2 CO 3 1.5792g, CaCO 3 0.4510g, Nb 2 o 5 19.7652g, SrCO 3 8. 2046g, Bi 2 o 3 0.03g, mix evenly, put the raw material mixture into a nylon tank, add absolute ethanol and zirconium balls, the mass ratio of absolute ethanol to the raw material mixture is 1:1.2, fully mix and ball mill with a ball mill at 401 rpm for 16 hours, separate For zirconium balls, put the raw material mixture in a drying oven at 80°C for 12 hours, grind with a mortar for 30 minutes, and pass through an 80-mesh sieve.

[0038] 2. Pre-burning

[0039] Place the raw material mixture after step 1 through an 80-mesh sieve in an alumina crucible, and compact it with an agate rod so that its compacted density is 1.5g / cm 3 , covered, placed in a resistance furnace at 1200 ° C for 4 hours, cooled to room temperature naturally, and ground for 10 minutes with a ...

Embodiment 2

[0051] 1. Ingredients

[0052] According to Sr 1.85 Ca 0.15 NaNb 5 o 15 +0.15wt.%Bi 2 o 3 The stoichiometric ratio, weigh the raw material Na 2 CO 3 1.5792g, CaCO 3 0.4510g, Nb 2 o 5 19.7652g, SrCO 3 8. 2046g, Bi 2 o 3 0.045g, mix evenly, put the raw material mixture into a nylon tank, add absolute ethanol and zirconium balls, the mass ratio of absolute ethanol to the raw material mixture is 1:1.2, fully mix and ball mill with a ball mill at 401 rpm for 16 hours, separate For zirconium balls, put the raw material mixture in a drying oven at 80°C for 12 hours, grind with a mortar for 30 minutes, and pass through an 80-mesh sieve.

[0053] 2. Pre-burning

[0054] Place the raw material mixture after step 1 through an 80-mesh sieve in an alumina crucible, and compact it with an agate rod so that its compacted density is 1.5g / cm 3 , covered, placed in a resistance furnace for pre-calcination at 1180°C for 4 hours, cooled naturally to room temperature, and ground for...

Embodiment 3

[0066] 1. Ingredients

[0067] According to Sr 1.85 Ca 0.15 NaNb 5 o 15 +0.20wt.%Bi 2 o 3 The stoichiometric ratio, weigh the raw material Na 2 CO 3 1.5792g, CaCO 3 0.4510g, Nb 2 o 5 19.7652g, SrCO 3 8. 2046g, Bi 2 o 3 0.06g, mix evenly, put the raw material mixture into a nylon tank, add absolute ethanol and zirconium balls, the mass ratio of absolute ethanol to the raw material mixture is 1:1.2, fully mix and ball mill with a ball mill at 401 rpm for 16 hours, separate For zirconium balls, put the raw material mixture in a drying oven at 80°C for 12 hours, grind with a mortar for 30 minutes, and pass through an 80-mesh sieve.

[0068] 2. Pre-burning

[0069] Place the raw material mixture after step 1 through an 80-mesh sieve in an alumina crucible, and compact it with an agate rod so that its compacted density is 1.5g / cm 3 , covered, placed in a resistance furnace for pre-calcination at 1180°C for 4 hours, cooled naturally to room temperature, and ground for ...

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Abstract

The invention discloses a high-d33 lead-free strontium calcium niobate sodium tungsten bronze piezo-ferroelectric ceramic material and a preparation method thereof. The general formula of the ceramic material is Sr1.85Ca0.15NaNb5O15+x wt.%M, wherein M is Bi2O3, CuO or Li2CO3, and x is 0.1-0.25. The Bi, Cu and Li are doped to modify Sr1.85Ca0.15NaNb5O15, thereby greatly enhancing the d33 of the Sr1.85Ca0.15NaNb5O15-system dielectric ceramic. The lead-free strontium calcium niobate sodium tungsten bronze piezo-ferroelectric ceramic material has lower dielectric loss, higher maximum dielectric constant and obviously higher relaxation property, i.e., the ceramic material has higher dielectric constant within a wider temperature range. Besides, the ceramic material has favorable ferroelectric properties. The doping modification is adopted to lower the coercive field, so that the high-temperature air is polarized, thereby greatly enhancing the d33 of the ceramic material and futher displaying the piezoelectric properties of the ceramic material. The preparation method of the ceramic material is simple, and has the advantages of high repetitiveness and high yield.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic materials, in particular to a high-d 33 Lead-free strontium niobate calcium sodium tungsten bronze piezoelectric ferroelectric ceramic material and preparation method thereof. Background technique [0002] With the progress of society and the development of human beings, the miniaturization and environmental protection of electronic components have put forward new requirements for ferroelectric ceramics, that is, ferroelectric devices are required to be miniaturized, chip-shaped, thin-film, integrated, and lead-free. In addition, due to the increasingly harsh service conditions, ferroelectric ceramics are required to have high dielectric ferroelectric properties in a wide temperature range, but the current material system cannot meet the requirements. Since the 1970s, relaxor ferroelectrics have attracted the attention of the engineering community because of their high dielectric prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/88C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B41/5116C04B41/88C04B2235/3201C04B2235/3203C04B2235/3208C04B2235/3213C04B2235/3281C04B2235/3298C04B41/4535
Inventor 杨祖培康守诚魏灵灵晁小练
Owner SHAANXI NORMAL UNIV
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