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A bismuth sodium titanate-strontium titanate submicron rod and its preparation method and application

A technology of sodium bismuth titanate and sub-micron rods is applied in the field of preparation of lead-free piezoelectric ferroelectric material sub-micron rods, and can solve problems such as no reports of bismuth titanate.

Active Publication Date: 2020-12-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no relevant report on bismuth sodium titanate-strontium titanate composite submicron rods

Method used

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  • A bismuth sodium titanate-strontium titanate submicron rod and its preparation method and application
  • A bismuth sodium titanate-strontium titanate submicron rod and its preparation method and application
  • A bismuth sodium titanate-strontium titanate submicron rod and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] The first step of molten salt method to prepare Na 2 Ti 6 o 13 Single crystal submicron rods:

[0123] Weigh 2.650g Na 2 CO 3 Powder, 11.975g TiO 2 Powder and 29.250g NaCl powder, using absolute ethanol as the medium, wet ball milling for 24h, after uniform mixing, drying, sieving powder, putting the mixed powder in an alumina crucible, and raising the temperature to 1050°C at a rate of 5°C / min (sintering temperature), heat preservation 2 hours, after heat preservation time finishes, naturally cool to room temperature. The obtained product was soaked in deionized water, suction filtered, cleaned, and then dried in a drying oven at 80°C to obtain Na 2 Ti 6 o 13 Single crystal submicron rods.

Embodiment 2

[0125] Preparation of NBT polycrystalline submicron rods by molten salt method in the second step:

[0126] Weigh 2.710g Na 2 Ti 6 o 13 Single crystal submicron rod (made in embodiment 1), 0.265g Na 2 CO 3 Powder, 3.495gBi 2 o 3 Powder and 12.940g NaCl powder, with absolute ethanol as the medium, magnetically stirred for 6h, after uniform mixing, dried, sieved, put the mixed powder in an alumina crucible, and raised the temperature to 900°C at a rate of 5°C / min , heat preservation for 6 hours, after the heat preservation time is over, cool down to room temperature naturally. The obtained product was soaked in deionized water, suction filtered, washed, and then dried in a drying oven at 80° C. to obtain NBT polycrystalline submicron rods.

Embodiment 3

[0128] The second step is to prepare NBT-0.10ST polycrystalline submicron rods by molten salt method:

[0129] Weigh 2.435g Na 2 Ti 6 o 13 Single crystal submicron rod (made in embodiment 1), 0.239g Na 2 CO 3 Powder, 3.145gBi 2 o 3 Powder, 0.443g SrCO 3 Powder, 0.240g TiO 2 Powder and 13.003g NaCl powder, with absolute ethanol as the medium, magnetically stirred for 6h, after uniform mixing, dried, sieved, put the mixed powder in an alumina crucible, and raised the temperature to 900°C at a rate of 5°C / min. Keep warm for 2 hours, and cool down to room temperature naturally after the heat preservation time is over. The obtained product was soaked in deionized water, suction filtered, washed, and then dried in a drying oven at 80° C. to obtain NBT-0.10ST polycrystalline submicron rods.

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Abstract

The invention discloses a sodium bismuth titanate-strontium titanate composite piezoelectric ferroelectric material in a polycrystal submicron rod shape. The invention also provides a preparation method of the composite material. The preparation method comprises the following steps: (1) by taking a sodium source A and titanium dioxide as reactants, weighing according to a stoichiometric ratio of Na2TiO13, and mixing with fused salt; sintering the mixed materials at 1000 to 1100 DEG C, thus obtaining sodium titanate monocrystal submicron rods; (2) by taking titanium dioxide, a sodium source B, a bismuth source, a strontium source and the sodium titanate monocrystal submicron rods as reactants, weighing according to a stoichiometric ratio of a chemical formula Na0.5Bi0.5TiO3-xSrTiO3, and mixing with fused salt; sintering the mixed materials at 850 to 950 DEG C, and washing and drying a sintering product to obtain the sodium bismuth titanate-strontium titanate composite piezoelectric ferroelectric material. The sodium titanate monocrystal submicron rods are creatively taken as a precursor, various key parameters of a subsequent two-section molten-salt growth method are controlled, and the rodlike submicron-level sodium bismuth titanate-strontium titanate composite piezoelectric ferroelectric material can be surprisingly prepared by topological reaction.

Description

technical field [0001] The invention relates to a sodium bismuth titanate-strontium titanate submicron rod and a preparation method thereof, belonging to the field of preparation of lead-free piezoelectric ferroelectric material submicron rods. Background technique [0002] As an important functional material, piezoelectric ferroelectric materials have irreplaceable application value in the fields of electronics, machinery and communication. Using their piezoelectric properties, they can be prepared into various sensors, transducers and driving devices. Using its dielectric properties, it can be prepared into various capacitors and energy storage devices. At present, the commonly used piezoelectric ferroelectric materials are lead-based materials such as lead zirconate titanate (PZT), which has excellent piezoelectric, ferroelectric and dielectric properties, but lead is toxic, which will endanger human health and pollute the environment. , so it is urgent to seek a lead-fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/626
CPCC04B35/47C04B35/62605C04B2235/3234C04B2235/5445
Inventor 张斗周学凡罗行吴忠周科朝
Owner CENT SOUTH UNIV
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