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Preparation of pyrochlore structure bi by solid state reaction method 2 ti 2 o 7 ceramic method

A solid-phase reaction method and a technology for pyrochlore are applied in the field of preparing pyrochlore-structured Bi2Ti2O7 ceramics by a solid-phase reaction method, which can solve the problems of low yield and complicated operation, and achieve the effects of low cost, simple reaction process, and low requirements for reaction equipment.

Active Publication Date: 2021-03-30
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods generally have low yields and complicated operations. If the traditional solid-phase reaction method can be used, these shortcomings can be well overcome.

Method used

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  • Preparation of pyrochlore structure bi by solid state reaction method <sub>2</sub> ti <sub>2</sub> o <sub>7</sub> ceramic method
  • Preparation of pyrochlore structure bi by solid state reaction method <sub>2</sub> ti <sub>2</sub> o <sub>7</sub> ceramic method
  • Preparation of pyrochlore structure bi by solid state reaction method <sub>2</sub> ti <sub>2</sub> o <sub>7</sub> ceramic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of Bi by solid state reaction method 2 Ti 2 o 7 The preparation method of ceramics, concrete preparation steps are as follows:

[0028] 1) Weigh 1.4345gBi 2 o 3 In the mortar, weigh 0.5655g TiO 2 into the mortar; adding absolute ethanol for grinding, after grinding three times, put it in a drying oven to dry overnight, and the drying temperature is 120°C;

[0029] 2) Put the dried mixture powder in a clean crucible, then put it into a muffle furnace for pre-burning, the pre-burning temperature is 750°C, and the pre-burning time is 6 hours;

[0030] 3) Put the pre-calcined product in an agate mortar, add an appropriate amount of absolute ethanol and a small amount of PVA solution, grind it thoroughly to make it evenly mixed, then put it in a drying oven to dry overnight, and the drying temperature is 120°C;

[0031] 4) Put the dried mixture in step 3) into a mold of a tablet machine for dry pressing, slowly pressurize to 224MPa, and hold the pressure fo...

Embodiment 2

[0035] Preparation of Bi by solid state reaction method 2 Ti 2 o 7 The preparation method of ceramics, concrete preparation steps are as follows:

[0036] 1) Weigh 1.424gBi 2 o3 In the mortar, weigh 0.576g TiO accordingly 2 into the mortar; adding absolute ethanol for grinding, after grinding three times, put it in a drying oven to dry overnight, and the drying temperature is 120°C;

[0037] 2) Put the dried mixture powder in a clean crucible, then put it into a muffle furnace for pre-burning, the pre-burning temperature is 800°C, and the pre-burning time is 6 hours;

[0038] 3) Put the pre-calcined product in an agate mortar, add an appropriate amount of absolute ethanol and a small amount of PVA solution, grind it thoroughly to make it evenly mixed, then put it in a drying oven to dry overnight, and the drying temperature is 120°C;

[0039] 4) Put the dried mixture in step 3) into a tablet machine mold for dry pressing, slowly pressurize to 224MPa, hold the pressure for...

Embodiment 3

[0042] Preparation of Bi by solid state reaction method 2 Ti 2 o 7 The preparation method of ceramics, concrete preparation steps are as follows:

[0043] 1) Weigh 1.4171gBi 2 o 3 In the mortar, weigh 0.5829g TiO accordingly 2 into the mortar. Add anhydrous ethanol for grinding, grind three times and put it in a drying oven to dry overnight at a drying temperature of 120°C;

[0044] 2) Put the dried mixture powder in a clean crucible, then put it into a muffle furnace for pre-burning, the pre-burning temperature is 800°C, and the pre-burning time is 6 hours;

[0045] 3) Put the pre-calcined product in an agate mortar, add an appropriate amount of absolute ethanol and a small amount of PVA solution, grind it thoroughly to make it evenly mixed, then put it in a drying oven to dry overnight, and the drying temperature is 120°C;

[0046] 4) Put the dried mixture in step 3) into a tablet machine mold for dry pressing, slowly pressurize to 224MPa, hold the pressure for 10 min...

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Abstract

The invention discloses a method for preparing bismuth titanate (Bi2Ti2O7) ceramic of a pyrochlore structure by means of a solid-phase reaction approach. The method includes the following steps of mixing appropriately excessive TiO2 and Bi2O3,conducting pre-burning at certain temperature,conducting preforming,conducting sintering at the appropriate temperature,and then obtaining the Bi2Ti2O7 ceramic of the pyrochlore structure. The method has the advantage that the Bi2Ti2O7 ceramic of the mono-phase pyrochlore structure can be obtained by means of the conventional solid-phase reaction approach. The preparation mode is simple,the reaction conditions are mild,the cost is low,and the repeatability is high.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramic materials, in particular to a solid phase reaction method for preparing pyrochlore structure Bi 2 Ti 2 o 7 ceramic method. Background technique [0002] Bismuth titanate is a class of photoelectric functional materials with excellent performance, and the common ones are Bi 4 Ti 3 o 12 、 Bi 2 Ti 4 o 11 、 Bi 12 TiO 20 、 Bi 2 Ti 2 o 7 etc. These materials mostly exhibit good ferroelectric, piezoelectric, and photocatalytic properties. Studying these materials will certainly produce no small value. Among them, Bi 4 Ti 3 o 12 and other materials have been studied by many scholars in the field of materials, and Bi with pyrochlore structure 2 Ti 2 o 7 Because the preparation is relatively difficult, there are few studies on its preparation method and performance in the literature. Bi 2 Ti 2 o 7 The pyrochlore structure can be expressed as A 2 O'·B 2 o ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/6562C04B2235/6567C04B2235/76C04B2235/786
Inventor 徐军夏禹彭闯
Owner WUHAN INSTITUTE OF TECHNOLOGY
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