Method for preparing bismuth titanate-barium titanate powder by hydrothermal method

A bismuth ferrite and barium titanate technology, which is applied in the field of preparation of bismuth ferrite-barium titanate functional ceramic powder, achieves the effects of high purity, uniform particle size distribution and simple process flow

Inactive Publication Date: 2010-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are no relevant reports at home and abroad on the synthesis of bismuth ferrite-barium titanate solid solution ceramic powder by hydrothermal method at relatively low temperature

Method used

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  • Method for preparing bismuth titanate-barium titanate powder by hydrothermal method
  • Method for preparing bismuth titanate-barium titanate powder by hydrothermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Using chemically pure KOH and deionized water to prepare a mineralizer solution with a concentration of 4mol / L; weighing and batching according to the stoichiometric ratio of bismuth ferrite-barium titanate: to analyze pure Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, BaCl 2 and TiCl 4 As raw material, according to the chemical formula 0.1BiFeO 3 -0.9BaTiO 3 Batching, mixing, adding hydrochloric acid and deionized water dropwise, and completely dissolving the raw materials by magnetic stirring; adding the prepared mixed solution dropwise to the aforementioned KOH mineralizer solution at a speed of 2 drops / second, and continuing magnetic stirring for 1 hour, Then ultrasonically oscillate for 30 minutes to obtain a yellow-brown precursor solution; put the above-mentioned precursor solution into a stainless steel reaction kettle lined with polytetrachlorethylene, the filling degree is 80%, seal the reaction kettle, and place the reaction kettle at 210 Keep warm in an o...

Embodiment 2

[0023] Using chemically pure KOH and deionized water to configure a mineralizer solution with a concentration of 10mol / L; weighing and batching according to the stoichiometric ratio of bismuth ferrite-barium titanate: to analyze pure Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, BaCl 2 and TiCl 4 As raw material, according to the chemical formula 0.5BiFeO 3 -0.5BaTiO 3 Batching, mixing, adding hydrochloric acid and deionized water dropwise, and completely dissolving the raw materials by magnetic stirring; adding the prepared mixed solution dropwise to the aforementioned KOH mineralizer solution at a rate of 1 drop / second, and continuing magnetic stirring for 0.5 hours, Then ultrasonically vibrated for 10 minutes to obtain a yellow-brown precursor solution; put the above-mentioned precursor solution into a stainless steel reaction kettle lined with polytetrachlorethylene, and the filling degree is 60%, seal the reaction kettle, and place the reaction kettle at 190 Keep warm ...

Embodiment 3

[0025] Using chemically pure KOH and deionized water to configure a mineralizer solution with a concentration of 6mol / L; weighing and batching according to the stoichiometric ratio of bismuth ferrite-barium titanate: to analyze pure Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, BaCl 2 and TiCl 4 As raw material, according to the chemical formula 0.9BiFeO 3 -0.1BaTiO 3 Batching, mixing, adding hydrochloric acid and deionized water dropwise, and completely dissolving the raw materials by magnetic stirring; adding the prepared mixed solution dropwise to the aforementioned KOH mineralizer solution at a rate of 1 drop / second, and continuing magnetic stirring for 0.5 hours, Then ultrasonically vibrate for 15 minutes to obtain a yellow-brown precursor solution; put the above-mentioned precursor solution into a stainless steel reactor lined with polytetrachlorethylene, and the filling degree is 70%, seal the reactor, and place the reactor at 200 Keep warm in an oven at ℃ for 36 hou...

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Abstract

The invention provides a method for preparing bismuth titanate-barium titanate powder by hydrothermal method. The method is characterized by belonging to the hydrothermal synthesis technique and the field of functional ceramics. The method comprises the following steps of: preparing KOH and deionized water into mineralizer solution of which the concentration is 4 to 10mol / L; blending Bi(NO3)3.5H2O, Fe(NO3)3.9H2O, BaCl2 and TiCl4, which serve as raw materials, according to the following chemical formula: xBiFeO3-(1-x)BaTiO3 (x is more than or equal to 0.1 and less than or equal to 0.9), addinghydrochloric acid and the deionized water dropwise into the raw materials, and uniformly stirring to completely dissolve the raw materials; slowly adding the mixture into the KOH mineralizer solutiondropwise, and uniformly stirring to obtain fulvous precursor solution; and adding the precursor solution into a reactor, putting the reactor in a 200 DEG C oven for keeping the temperature for 6 to 36 hours, and naturally cooling and filtering to the reactor to obtain the reaction product, namely the bismuth titanate-barium titanate powder. The bismuth titanate-barium titanate powder solid solution powder prepared by the invention has the advantages of good crystallization, uniform grain distribution, simple process flow, short reaction time and energy conservation.

Description

technical field [0001] The invention relates to a preparation method of bismuth ferrite-barium titanate functional ceramic powder, in particular to a method for preparing bismuth ferrite-barium titanate powder by a hydrothermal method. Background technique [0002] Piezoelectric ceramics are widely used in high-temperature environments such as military, medical and aerospace. Therefore, the preparation of piezoelectric ceramic materials with high Curie temperature has become a research hotspot. Barium titanate is a promising lead-free piezoelectric ceramic, but its Curie temperature is too low to affect its use in high-temperature environments, and its application fields are greatly limited. Bismuth ferrite, as a typical single-phase ferroelectric material, has a very high ferroelectric Curie temperature (T C =830℃) and magnetic transition temperature (T N =370°C), it is one of the very few materials that have a magnetoelectric coupling effect above room temperature. Bism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/468
Inventor 张海龙秦红彬张波萍
Owner UNIV OF SCI & TECH BEIJING
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