Preparation method of (Bi<0.5>Na<0.5>)<1-x>SrxTiO3 system-based lead-free relaxor ferroelectrics

A ferroelectric and system technology, which is applied in the field of preparation of lead-free relaxor ferroelectrics of 1-xSrxTiO3 system, can solve problems such as restricting use performance, and achieve the effects of good relaxation characteristics, improved dielectric constant and large output

Inactive Publication Date: 2017-05-17
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Also, a high T m (~320°C) makes its dielectric constant have a maximum value at a higher temperature, while at room temper

Method used

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  • Preparation method of (Bi&lt;0.5&gt;Na&lt;0.5&gt;)&lt;1-x&gt;SrxTiO3 system-based lead-free relaxor ferroelectrics
  • Preparation method of (Bi&lt;0.5&gt;Na&lt;0.5&gt;)&lt;1-x&gt;SrxTiO3 system-based lead-free relaxor ferroelectrics
  • Preparation method of (Bi&lt;0.5&gt;Na&lt;0.5&gt;)&lt;1-x&gt;SrxTiO3 system-based lead-free relaxor ferroelectrics

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preparation example Construction

[0033] A new type (Bi 0.5 Na 0.5 ) 1-x Sr x TiO 3 The preparation method of the lead-free relaxation ferroelectric system comprises the following steps:

[0034] Step 1: (Bi 0.5 Na 0.5 ) 1-x Sr x TiO 3 System ceramics (x=0.45, 0.55, 0.65, 0.75, 0.85),

[0035] a. When x=0.45, Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The molar ratio is 11:11:9:53;

[0036] b. When x=0.55, Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The molar ratio is 9:9:11:47;

[0037] c. When x=0.65, Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The molar ratio is 7:7:13:41;

[0038] d. When x=0.75, Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The molar ratio is 1:1:3:7;

[0039] e. When x=0.85, Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The molar ratio is 3:3:17:29;

[0040] Weigh the corresponding mass of Na according to the above molar ratio 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The mixture is obtained, and the mixture is mixed with zirconia ball stones and deionized water according to the mass ...

Embodiment 1

[0047] The present invention (Bi 0.5 Na 0.5 ) 1-x Sr x TiO 3 System lead-free relaxor ferroelectric, its formulation is (Bi 0.5 Na 0.5 ) 1- x Sr x TiO 3 , where x=0.45, where x is a mole percent.

[0048] Step 1: Weigh the corresponding mass of Na according to the molar ratio 11:11:9:53 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The mixture is obtained, and the mixture is mixed with zirconia ball stones and deionized water according to the mass ratio of 1:2:1, and then ball milled and dried to obtain a dried material;

[0049] Step 2: After briquetting the dried material, place it in a muffle furnace at 840°C for 3 hours to form a complete batch;

[0050] Step 3: Carry out granulation and sieve successively with the full batching that step 2 obtains, the process of forming granulated material is: the mass concentration of polyvinyl alcohol in binder (polyvinyl alcohol aqueous solution, in polyvinyl alcohol aqueous solution is 4% ) is added to the whole ingredients for ...

Embodiment 2

[0054] The present invention (Bi 0.5Na 0.5 ) 1-x Sr x TiO 3 System lead-free relaxor ferroelectric, its formula is (Bi 0.5 Na 0.5 ) 1- x Sr x TiO 3 , where x=0.55, where x is a mole percent.

[0055] Step 1: Weigh the corresponding mass of Na according to the molar ratio 9:9:11:47 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 The mixture is obtained, and the mixture is mixed with zirconia ball stones and deionized water according to the mass ratio of 1:2:1, and then ball milled and dried to obtain a dried material;

[0056] Step 2: After briquetting the dried material, place it in a muffle furnace at 850°C for 3 hours to form a complete batch;

[0057] Step 3: Carry out granulation and sieve successively with the full batching that step 2 obtains, the process of forming granulated material is: the mass concentration of polyvinyl alcohol in binder (polyvinyl alcohol aqueous solution, polyvinyl alcohol aqueous solution is 5% ) is added to the whole batching for granulation,...

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Abstract

The invention discloses a preparation method of (Bi<0.5>Na<0.5>)<1-x>SrxTiO3 system-based lead-free relaxor ferroelectrics. The method comprises the steps of firstly weighing corresponding masses of Na2CO3, Bi2O3, SrCO3 and TiO2 according to the molar ratio to obtain a mixture; carrying out ball milling, drying and briquetting on the mixture to form a whole ingredient, sequentially carrying out pelleting and sieving on the whole ingredient to form a granulated material; pressing the granulated material to prepare a sample and sintering the prepared sample to obtain a sintered sample; and finally polishing and cleaning the sintered sample, evenly coating the front surface and the back surface of the polished and cleaned sintered sample with electrode slurry, and sintering the sample coated with a silver electrode to obtain the (Bi<0.5>Na<0.5>)<1-x>SrxTiO3 system-based lead-free relaxor ferroelectrics. The (Bi<0.5>Na<0.5>)<1-x>SrxTiO3 system-based lead-free relaxor ferroelectrics obtained by the method has a high dielectric constant and obvious relaxation characteristics, is suitable for a wider temperature range, adopts a simple preparation process, is low in material cost, environmentally friendly, and becomes an excellent important candidate material used as a high-end industrial application material instead of a lead-based ceramic material in technology and economy.

Description

technical field [0001] The invention relates to the field of ceramic dielectric materials, in particular to a (Bi 0.5 Na 0.5 ) 1-x Sr x TiO 3 The preparation method of the lead-free relaxor ferroelectric system. Background technique [0002] Relaxor ferroelectrics exhibit high dielectric constants, large piezoelectric responses, strong nonlinear effects, and significant temperature and frequency dependencies. These exceptional relaxation properties are caused by the domain structure dominated by short-range order. The most important feature of relaxor ferroelectrics is that the dielectric constant has a wide range of extreme values ​​and corresponds to a relatively wide temperature position (T m ), which is different from the Curie temperature point of traditional ferroelectrics (T C ). Compared with conventional perovskite-structured ferroelectrics, this maximum value is not from the paraelectric phase transition to the long-range ordered ferroelectric phase, accomp...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/475C04B35/622C04B41/88
CPCC04B35/47C04B35/475C04B35/622C04B41/5116C04B41/88C04B2235/3201C04B2235/656C04B2235/768C04B2235/96C04B41/4539C04B41/0072
Inventor 蒲永平崔晨薇
Owner SHAANXI UNIV OF SCI & TECH
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