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Method for preparing monocrystalline CaTiO3 dendrite

A single crystal and ethanol technology, applied in the directions of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of difficult preparation and complexity, and achieve the effect of convenient control and simple process route.

Active Publication Date: 2013-06-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to CaTiO 3 Belonging to the cubic crystal system, it generally presents a cubic shape, CaTiO 3 It is composed of three elements, Ca, Ti, and O, so how to control the preparation of dendrites under non-equilibrium conditions is particularly complicated and difficult to prepare

Method used

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  • Method for preparing monocrystalline CaTiO3 dendrite
  • Method for preparing monocrystalline CaTiO3 dendrite
  • Method for preparing monocrystalline CaTiO3 dendrite

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1) Dissolve butyl titanate in ethanol, stir until uniform to obtain liquid A, the molar ratio of butyl titanate to ethanol is 1:10;

[0019] 2) Dissolve calcium chloride dihydrate in distilled water, mix and stir with ethanol to obtain liquid B, the molar ratio of butyl titanate: calcium chloride dihydrate: water: ethanol is 1:1:400:5;

[0020] 3) Drop A solution into B solution drop by drop, stir for 10 minutes, then gradually add NaOH solution dropwise, adjust the pH value to 10, continue to stir for 15 minutes, mix and put it in a hydrothermal kettle, and keep it warm for 36 hours at a hydrothermal temperature of 180°C , washed 6 times with distilled water to obtain CaTiO 3 Dendrite. Its X-ray diffraction pattern is as figure 1 As shown, its diffraction peaks are orthogonal to those of CaTiO 3 The standard spectra of the phases are consistent, indicating that the obtained product is orthorhombic CaTiO 3 Mutually.

Embodiment 2

[0022] 1) Dissolve butyl titanate in ethanol, stir until uniform to obtain liquid A, the molar ratio of butyl titanate to ethanol is 1:6;

[0023] 2) Dissolve calcium chloride dihydrate in distilled water, mix and stir with ethanol to obtain liquid B, the molar ratio of butyl titanate: calcium chloride dihydrate: water: ethanol is 1:1:400:5;

[0024] 3) Drop A solution into B solution drop by drop, stir for 5 minutes, then gradually add NaOH solution dropwise, adjust the pH value to 10, continue stirring for 15 minutes, mix and put it in a hydrothermal kettle, and keep it warm for 24 hours at a hydrothermal temperature of 200°C . Wash 3 times with distilled water to obtain CaTiO 3 Dendrite. Its X-ray diffraction pattern is as figure 2 As shown, its diffraction peaks are orthogonal to those of CaTiO 3 The standard spectra of the phases are consistent, indicating that the obtained product is orthorhombic CaTiO 3 Mutually.

[0025] The CaTiO that present embodiment makes ...

Embodiment 3

[0027] 1) Dissolve butyl titanate in ethanol, stir until uniform to obtain liquid A, the molar ratio of butyl titanate to ethanol is 1:6;

[0028] 2) Dissolve calcium chloride dihydrate in water, mix and stir with ethanol to obtain liquid B, butyl titanate: dihydrate

[0029] The molar ratio of calcium chloride: water: ethanol is 1:1:20:9;

[0030] 3) Drop A solution into B solution drop by drop, stir for 8 minutes, then gradually add NaOH solution dropwise, adjust the pH value to 10, continue to stir for 15 minutes, mix and put it in a hydrothermal kettle, and keep it warm at a hydrothermal temperature of 260°C for 18 hours , washed 6 times with distilled water to obtain CaTiO 3 Dendrite.

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Abstract

The invention discloses a method for preparing a monocrystalline CaTiO3 dendrite by using a hydrothermal method. The method comprises the following steps: firstly dissolving a titanium compound in an ethanol solvent to obtain an A solution; then mixing calcium chloride dihydrate, distilled water and an ethanol solvent to obtain a B solution; and slowly and dropwisely adding the A solution into the B solution, adjusting the pH value to 10-11, stirring and mixing, placing the mixture in a hydrothermal kettle, and keeping the temperature at 180-260 DEG C for 1-36 hours to obtain the CaTiO3 dendrite. Through the method, the pure CaTiO3 dendrite is prepared by a one-step hydrothermal method by using inexpensive butyl titanate and calcium chloride dihydrate as the raw materials and water-ethanol as the solvent under low-temperature non-equilibrium conditions, the process route is simple, and the morphology of the CaTiO3 dendrite can be conveniently controlled by adjusting the process parameters.

Description

technical field [0001] The present invention relates to the preparation of single crystal CaTiO 3 Dendrite method. Background technique [0002] ABOs 3 Perovskite composite oxides have a stable crystal structure and good thermal stability, covering almost the entire range of electrical properties: ferroelectrics, paraelectrics, piezoelectrics, antiferroelectrics, insulators, semiconductors, fast ion conduction, Metal conductors and superconductors, in addition to good catalytic, gas-sensing, optical and other properties, are currently one of the new functional materials with great development prospects. Therefore, it has attracted widespread attention. In recent years, CaTiO 3 It is widely researched and used in electronic components such as high-voltage ceramic capacitors and PTC thermistors, electrode materials, luminescent materials, solid electrolytes and high-adsorption waste devices. [0003] Due to its unique shape and size, the potential application of dendrite i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/32C30B7/10
Inventor 赵高凌董伟霞徐刚韩高荣
Owner ZHEJIANG UNIV
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