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Method for preparing NdNbO4 microwave dielectric ceramic of fergusonite structure by use of wet chemical process

A technology of microwave dielectric ceramics and wet chemistry, applied in the field of NdNbO4 microwave dielectric ceramics with yttrium niobium ore structure, can solve the problems of large particle size of synthetic powder, unfavorable ceramic sintering, low synthesis temperature, etc., and achieve low synthesis temperature, stable and single phase , good dispersion effect

Inactive Publication Date: 2014-07-30
UNIV OF JINAN
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  • Description
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Problems solved by technology

[0004] The purpose of the present invention is based on the application requirement of reducing the sintering temperature of ceramics, and overcomes the disadvantages of high temperature of traditional solid-phase synthesis powder and large particle size of synthetic powder, which is not conducive to subsequent ceramic sintering; it provides a method for preparing NdNbO by wet chemical process 4 Microwave dielectric ceramic method, using wet chemical method to finely synthesize brown yttrium niobium ore structure ceramic powder, with low synthesis temperature, uniform ceramic particles (about 50nm), good dispersion, pure phase, powder with nanometer particle size and high ratio Surface energy, showing significant advantages such as high activity, can achieve low temperature sintering, and maintain good microwave dielectric properties

Method used

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  • Method for preparing NdNbO4 microwave dielectric ceramic of fergusonite structure by use of wet chemical process
  • Method for preparing NdNbO4 microwave dielectric ceramic of fergusonite structure by use of wet chemical process
  • Method for preparing NdNbO4 microwave dielectric ceramic of fergusonite structure by use of wet chemical process

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Experimental program
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Embodiment 1

[0039] according to figure 1 Preparation of NdNbO by Wet Chemical Process 4 Ceramic process flow diagram with the following steps:

[0040] 1) prepare the citric acid aqueous solution of Nd ion

[0041] (a) According to NdNbO 4 Stoichiometric ratio of microwave ceramic phases, adjustment of Nd 2 o 3 / Nb 2 o 5 The molar ratio is 1+x / 1 (02 o 3 A total of 10.0941 grams, dissolved in nitric acid, magnetically stirred to form a transparent solution;

[0042] (b) take by weighing 23.0568 grams of citric acid, add in the above-mentioned solution and stir, impel citric acid and Nd ion to form complex, make transparent Nd ion citric acid aqueous solution;

[0043] 2) Prepare the aqueous citric acid solution of Nb ion

[0044] (a) According to NdNbO 4 For the stoichiometric ratio of the microwave ceramic phase, 7.97 grams of niobium oxide were weighed, placed in a ceramic medium reactor, sealed after adding 100ml of hydrofluoric acid, and then subjected to a high temperature...

Embodiment 2

[0054] according to figure 1 Preparation of NdNbO by Wet Chemical Process 4 Ceramic process flow diagram with the following steps:

[0055] 1) prepare the citric acid aqueous solution of Nd ion

[0056] (a) According to NdNbO 4 Stoichiometric ratio of microwave ceramic phases, adjustment of Nd 2 o 3 / Nb 2 o 5 The molar ratio is 1+x / 1 (02 o 3 A total of 15.1411 grams, dissolved in nitric acid, magnetically stirred to form a transparent solution;

[0057] (b) take by weighing 51.8778 grams of citric acid, add in the above-mentioned solution and stir, impel citric acid and Nd ion to form complex, make transparent Nd ion citric acid aqueous solution;

[0058] 2) Prepare the aqueous citric acid solution of Nb ion

[0059] (a) According to NdNbO 4 For the stoichiometric ratio of the microwave ceramic phase, 11.955 grams of niobium oxide were weighed, placed in a ceramic medium reactor, sealed after adding 150 ml of hydrofluoric acid, and then subjected to a high temperat...

Embodiment 3

[0069] according to figure 1 Preparation of NdNbO by Wet Chemical Process 4 Ceramic process flow diagram with the following steps:

[0070] 1) prepare the citric acid aqueous solution of Nd ion

[0071] (a) According to NdNbO 4 Stoichiometric ratio of microwave ceramic phases, adjustment of Nd 2 o 3 / Nb 2 o 5 The molar ratio is 1+x / 1 (02 o 3 A total of 15.1411 grams, dissolved in nitric acid, magnetically stirred to form a transparent solution;

[0072] (b) take by weighing 45.8778 grams of citric acid, add in the above-mentioned solution and stir, impel citric acid and Nd ion to form complex, make transparent Nd ion citric acid aqueous solution;

[0073] 2) Prepare the aqueous citric acid solution of Nb ion

[0074] (a) According to NdNbO 4 For the stoichiometric ratio of the microwave ceramic phase, 11.966 grams of niobium oxide were weighed, placed in a ceramic medium reaction vessel, sealed after adding 150ml of hydrofluoric acid, and then subjected to high-tem...

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Abstract

The invention belongs to the technical field of preparation and application of ceramics, and particularly relates to a method for preparing NdNbO4 microwave dielectric ceramic by utilizing a wet chemical process. The technical scheme is as follows: the method for preparing the NdNbO4 microwave dielectric ceramic by utilizing the wet chemical process comprises the following steps: (1) preparing a citric acid water solution of Nd ions; (2) preparing a citric acid water solution of Nb ions; (3) synthesizing a NdNbO4 microwave dielectric ceramic nanometer precursor and preparing the ceramic. The method has the remarkable advantages that the synthetic temperature is low, ceramic particles are uniform, the dispersity is good, the phase is pure, and the powder body has a nanometer particle size (which is about 50 nanometers), also has high specific surface energy and has relatively high activity, and the like. In comparison with a conventional solid phase method, the method disclosed by the invention can be used for reducing the sintering temperature by 100 to 200 DEG C, realizing intermediate and low-temperature sintering and also retaining good microwave dielectric performance of the ceramic, and is expected to meet the LTCC application requirements.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of electronic ceramics, in particular to a method for finely preparing NdNbO with a brown yttrium niobium ore structure by using a wet chemical process. 4 Microwave dielectric ceramics. Background technique [0002] With the rapid development of the microwave communication industry, the demand for miniaturized and high-performance microwave circuits and microwave devices in the fields of mobile communications, car phones, TV satellites, military radars, global positioning systems, and portable phones is increasing, requiring continuous development A new type of microwave dielectric material with more superior performance. Based on the research trends of microwave dielectric ceramics, Japanese scholar Hitoshi Ohsato combined the needs of the application field and divided microwave dielectric ceramic materials into three categories: 1) low dielectric constant ( ε r <20, Q·?...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 吴海涛梅全静李从英郭靖栋
Owner UNIV OF JINAN
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