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KNN-based ceramic with high-piezoelectric and high-ferroelectric properties and preparation method thereof

A technology of high-voltage electricity and electrical properties, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of poor piezoelectric and ferroelectric properties of KNN-based ceramics that are difficult to apply in practice And other issues

Pending Publication Date: 2019-08-16
HARBIN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0005] The present invention solves the technical problem that existing KNN-based ceramics have poor piezoelectric and ferroelectric properties, which makes it difficult to be practically applied; and provides a KNN-based ceramic with high voltage and high ferroelectric properties and a preparation method thereof

Method used

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  • KNN-based ceramic with high-piezoelectric and high-ferroelectric properties and preparation method thereof
  • KNN-based ceramic with high-piezoelectric and high-ferroelectric properties and preparation method thereof
  • KNN-based ceramic with high-piezoelectric and high-ferroelectric properties and preparation method thereof

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Embodiment 1

[0027] Embodiment 1: the general formula of a kind of KNN base ceramics with high voltage and high ferroelectric performance in the present embodiment is (K 0.48 Na 0.48 Li 0.04 )(Nb 0.8 Ta 0.2 )O 3 :0.1%MnO 2 ; It is specifically prepared by the following steps:

[0028] Step 1, according to (K 0.48 Na 0.48 Li 0.04 )(Nb 0.8 Ta 0.2 )O 3 The stoichiometric ratio of raw materials were weighed and the mass purity was 99.50% Na 2 CO 3 , K with a mass purity of 99.00% 2 CO 3 , mass purity is 99.90% Nb 2 o 5 Li with a mass purity of 99.99%2 CO 3 , Ta with a mass purity of 99.50% 2 o 5 , and then use absolute ethanol to wet ball mill, dry at 80°C for 10 hours, grind for 10 minutes, and press into tablets;

[0029] Ball milling process parameters in step 1: the rotating speed is 300r / min, the ball milling time is 12h, and the ball-to-material ratio is 1:3.

[0030] Step 2, then place it in an alumina crucible, keep it warm at 900°C for 4 hours, and grind it;

[0...

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Abstract

The invention discloses a KNN-based ceramic with high-piezoelectric and high-ferroelectric properties and a preparation method thereof, belongs to the technical field of piezoelectric materials, and solves the technical problem of poor piezoelectric property and ferroelectric property of the existing KNN-based ceramics. The KNN-based ceramic has the following general formula: (K0.48Na0.48Li0.04)(Nb0.8Ta0.2)O3:0.1%MnO2. Li2CO3, Ta2O5 and MnO2 metals are doped in a KNN ceramic, and the KNN-based ceramic is produced by sintering at 1126 DEG C. The piezoelectric property d<33> of the (K0.48Na0.48Li0.04)(Nb0.8Ta0.2)O3:0.1%MnO2 ceramic is 251 pC / N, the spontaneous polarization intensity P<s> is 25.525 [um]C / cm<2>, and the coercive field E<c> is 10.7 kV / cm.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric materials; in particular, it relates to a KNN-based ceramic with high voltage and high ferroelectric properties and a preparation method thereof. Background technique [0002] Piezoelectric materials are mainly used in medical treatment, industrial testing, railway transportation, marine communication and detection, nuclear power plant safety, aerospace precision transmission and other fields. Since most of the previous studies are lead-based piezoelectric materials, lead-based piezoelectric materials will cause serious pollution to the environment, making lead-free piezoelectric ceramics become the mainstream of social research. Lead-free piezoelectric materials mainly include BaTiO 3 Base, Bi 1 / 2 Na 1 / 2 TiO 3 (BNT) base, bismuth layered structure, (K,Na)NbO 3 Base (KNN) material. [0003] Among them, potassium sodium niobate (KNN) based ceramics are made of antiferroelectric NaNbO 3...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/626H01L41/187
CPCC04B35/495C04B35/622C04B35/62605C04B2235/3201C04B2235/3203C04B2235/3251C04B2235/3267C04B2235/6567H10N30/853
Inventor 吴丰民张春晓王军军
Owner HARBIN UNIV OF SCI & TECH
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