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A kind of method for preparing bismuth sodium potassium titanate nano-microspheres by microemulsion method

A technology for preparing sodium and potassium bismuth titanate and nano-microspheres is applied in the field of preparing nano-microspheres of sodium and potassium bismuth titanate by a microemulsion method, which can solve the problems affecting the electrical properties of piezoelectric ceramic materials, the uneven size of synthetic powder particles, and the pressure The problem of low purity of electrical ceramic materials, to achieve the effect of huge surface free energy, strong repeatability, and high stability

Inactive Publication Date: 2017-03-01
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is easy to mix impurities during the ball milling process, and the prepared piezoelectric ceramic material has relatively low purity, and it is difficult to highly disperse the components in the raw materials, so it is easy to cause the synthetic powder particle size to be uneven, the surface activity is poor, and It is easy to form agglomerates, and these shortcomings seriously affect the electrical properties of piezoelectric ceramic materials. In addition, piezoelectric ceramic materials prepared by traditional solid-state reaction methods can only obtain materials with micron-sized particles

Method used

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  • A kind of method for preparing bismuth sodium potassium titanate nano-microspheres by microemulsion method
  • A kind of method for preparing bismuth sodium potassium titanate nano-microspheres by microemulsion method

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Embodiment 1

[0027] This embodiment includes the following steps:

[0028] Step 1, weigh sodium nitrate, potassium nitrate, bismuth nitrate and tetrabutyl titanate according to the molar ratio Na:K:Bi:Ti=0.4:0.1:0.5:1, then dissolve the weighed sodium nitrate and potassium nitrate in In deionized water, mixture A is obtained, and the bismuth nitrate taken by weighing is added to deionized water and mixed uniformly to obtain mixture B; the metal ion molar concentration in the mixture A is 0.25mol / L, and the molar concentration of bismuth nitrate in the mixture B is The concentration is 0.25mol / L;

[0029] Step 2. Mix cyclohexane and tetrabutyl titanate weighed in step 1 uniformly at a volume ratio of 7:1 to obtain a mixture C;

[0030] Step 3, surfactant and cosurfactant are mixed uniformly by volume ratio 4:1, obtain mixing aid; Described surfactant is made of cetyltrimethylammonium bromide and sorbitan monooleic acid Ester polyoxyethylene ether is mixed in molar ratio 2:1, and described...

Embodiment 2

[0036] This embodiment includes the following steps:

[0037] Step 1, weigh sodium nitrate, potassium nitrate, bismuth nitrate and tetrabutyl titanate according to the molar ratio Na:K:Bi:Ti=0.4:0.1:0.5:1, then dissolve the weighed sodium nitrate and potassium nitrate in In deionized water, mixture A is obtained, and the bismuth nitrate taken by weighing is added to deionized water and mixed uniformly to obtain mixture B; the metal ion molar concentration in the mixture A is 0.1mol / L, and the molar concentration of bismuth nitrate in the mixture B is The concentration is 0.5mol / L;

[0038] Step 2. Mix cyclohexane and tetrabutyl titanate weighed in step 1 uniformly at a volume ratio of 6:1 to obtain a mixture C;

[0039] Step 3, surfactant and cosurfactant are mixed uniformly by volume ratio 3:1, obtain mixing aid; Described surfactant is made of cetyltrimethylammonium bromide and sorbitan monooleic acid Ester polyoxyethylene ether is mixed at a molar ratio of 1:1, and the co...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] Step 1, weigh sodium nitrate, potassium nitrate, bismuth nitrate and tetrabutyl titanate according to the molar ratio Na:K:Bi:Ti=0.4:0.1:0.5:1, then dissolve the weighed sodium nitrate and potassium nitrate in In deionized water, mixture A is obtained, and the bismuth nitrate taken by weighing is added to deionized water and mixed uniformly to obtain mixture B; the metal ion molar concentration in the mixture A is 0.5mol / L, and the molar concentration of bismuth nitrate in the mixture B is The concentration is 0.1mol / L;

[0047] Step 2. Mix cyclohexane and tetrabutyl titanate weighed in step 1 uniformly at a volume ratio of 8:1 to obtain a mixture C;

[0048] Step 3, surfactant and cosurfactant are mixed uniformly by volume ratio 5:1, obtain mixing aid; Described surfactant is made of cetyltrimethylammonium bromide and sorbitan monooleic acid Ester polyoxyethylene ether is mixed with molar ratio 1.5:1, and describ...

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Abstract

The invention discloses a method for preparing bismuth sodium potassium titanate nanometer microspheres by a microemulsion method. The method is as follows: 1. Weigh each raw material, dissolve sodium nitrate and potassium nitrate in water to obtain mixture A, and mix bismuth nitrate and water Mix to obtain mixture B; 2. Mix cyclohexane and tetrabutyl titanate to obtain mixture C; 3. Prepare mixing aids; 4. Mix cyclohexane and mixing aids to obtain mixture D, after adding mixture A dropwise Adjust the pH value, then add mixture B dropwise to obtain mixture E; 5. Mix mixture C and mixture E, form a microemulsion after magnetic stirring, and age the microemulsion; 6. Filter after centrifugation, take the filter residue and wash it and drying to obtain bismuth sodium potassium titanate nanometer microspheres. The present invention can obtain bismuth sodium potassium titanate nano-microspheres with a single perovskite phase under lower temperature conditions, and the bismuth sodium potassium titanate nano-microspheres can be widely used in sensors, detectors and ultrasonic transducers, etc. High-tech technology field.

Description

technical field [0001] The invention belongs to the technical field of preparation technology of inorganic functional materials, and in particular relates to a method for preparing bismuth sodium potassium titanate nano-microspheres by a microemulsion method. Background technique [0002] Piezoelectric ceramics are functional materials with a wide range of uses, which can realize mutual conversion between mechanical energy and electrical energy. Bismuth sodium titanate series materials with perovskite structure have excellent characteristics such as large anisotropy of electromechanical coupling coefficient, high Curie temperature, small relative permittivity and good acoustic performance, and low sintering temperature, so they are regarded as One of the most promising candidates to replace traditional lead-containing piezoelectric ceramic materials. The solid solution system developed on this basis is bismuth sodium titanate potassium Na 0.5 Bi 0.5 TiO 3 -K 0.5 Bi 0.5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/626
Inventor 杜娴杜慧玲姚淼
Owner XIAN UNIV OF SCI & TECH
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