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Preparation method of bismuth magnesium niobate nanometer powder

A technology of bismuth magnesium niobate and nanopowder, which is applied in the field of electronic information materials and components, can solve the problems of uneven distribution of components, low density, etc., achieve low raw material prices, good sintering characteristics, and ensure uniformity and precision sexual effect

Inactive Publication Date: 2011-11-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for creation of fine particles called biomagnesium nitride ceramic (BNN) or BMnO3 instead of pure iron oxide. These tiny crystals have very strong properties at room temperatures but they are difficult to produce without expensive equipment like cathode ray tubes. They also provide improved performance compared to other materials such as tantalum pentoxide (Ta2θ2).

Problems solved by technology

This patents discuss various technical problem addressed during research into developing better microelectromechanical system (MEMS)-related products such as filters or switches due to their faster operation speeds and smaller sizes. However, currently available technologies like liquid crystal display technology require expensive equipment and complicated processes, while nanoparticle techniques offer advantages over other alternatives. Therefore, these issues must be solved before implementing them effectively at an industrial level.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of citric acid aqueous solution of niobium

[0027] (a) According to Bi 1.5 MgNb 1.5 o 7 The stoichiometric ratio of (BMN) weighs 0.03mol of Nb 2 o 5 , the Nb 2 o 5 Put in 50ml hydrofluoric acid, heat in water bath to Nb 2 o 5 all dissolved;

[0028] (b) adding ammoniacal liquor to the above-mentioned solution to adjust the pH value to 8, generating niobic acid precipitation;

[0029] (c) suction filter and wash the above precipitate, then add niobic acid into the aqueous solution of citric acid, and heat in a water bath so that the niobic acid is completely dissolved in the aqueous solution of citric acid to obtain a citric acid aqueous solution of niobium, the content of citric acid is 0.12mol.

[0030] 2. Add ethylene glycol to the niobium citric acid aqueous solution prepared in step 1, heat and stir, and the amount of ethylene glycol added is 0.12mol.

[0031] 3. Preparation of ethylene glycol solution of magnesium and bismuth

[0032] (a)...

Embodiment 2

[0040] 1. Preparation of citric acid aqueous solution of niobium

[0041] (a) According to Bi 1.5 MgNb 1.5 o 7 The stoichiometric ratio of (BMN) weighs 0.03mol of Nb 2 o 5 , the Nb 2 o 5 Put in 60ml hydrofluoric acid, heat in water bath to Nb 2 o 5 all dissolved;

[0042] (b) adding ammoniacal liquor to the above-mentioned solution to adjust the pH value to 9 to generate niobic acid precipitation;

[0043] (c) Suction filter and wash the above precipitate, then add niobic acid into the aqueous solution of citric acid, and heat in a water bath so that the niobic acid is completely dissolved in the aqueous solution of citric acid to obtain an aqueous solution of citric acid of niobium, the content of citric acid is 0.2mol.

[0044] 2. Add ethylene glycol to the niobium citric acid aqueous solution prepared in step 1, heat and stir, and the amount of ethylene glycol added is 0.8mol.

[0045] 3. Preparation of ethylene glycol solution of magnesium and bismuth

[0046] (...

Embodiment 3

[0054] 1. Preparation of citric acid aqueous solution of niobium

[0055] (a) According to Bi 1.5 MgNb 1.5 o 7 The stoichiometric ratio of (BMN) weighs 0.03mol of Nb 2 o 5 , the Nb 2 o 5 Put in 80ml hydrofluoric acid, heat in water bath to Nb 2 o 5 all dissolved;

[0056] (b) adding ammoniacal liquor to the above-mentioned solution to adjust the pH value to 9 to generate niobic acid precipitation;

[0057] (c) Suction filter and wash the above precipitate, then add niobic acid into the aqueous solution of citric acid, and heat in a water bath so that the niobic acid is completely dissolved in the aqueous solution of citric acid to obtain the aqueous solution of niobium citric acid, the content of citric acid is 0.28mol.

[0058] 2. Add ethylene glycol to the niobium citric acid aqueous solution prepared in step 1, heat and stir, and the amount of ethylene glycol added is 0.56mol.

[0059] 3. Preparation of ethylene glycol solution of magnesium and bismuth

[0060] (...

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Abstract

The invention discloses a preparation method of bismuth magnesium niobate nanometer powder. The method comprises the following steps: (1) preparing a citric acid aqueous solution of niobium; (2) adding glycol in the citric acid aqueous solution of niobium; (3) preparing an ethylene glycol solution of magnesium and bismuth; (4) adding the ethylene glycol solution of magnesium and bismuth obtained from the step (3) into the solution prepared in the step (2), uniformly stirring to obtain a bismuth magnesium niobium sol; drying the bismuth magnesium niobium sol at a temperature of 80 DEG C - 120 DEG C by baking, such that xerogel is formed; performing a heat treatment upon xerogel at a temperature of 550 DEG C - 750 DEG C to obtain nanometer powder of bismuth magnesium niobate (Bi1. 5MgNb1. 5O7). Bismuth magnesium niobate nanometer powder prepared by the invention has advantages of fine-sized particles (20 - 100nm), high activity, good sintering performance, high powder purity, no impurity, simple technology and low cost, Bi1. 5MgNb1. 5O7 phase can be generated under the condition of a temperature 100 DEG C - 300 DEG C lower than that of a solid phase method.

Description

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Claims

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Application Information

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Owner TIANJIN UNIV
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