Method for preparing gallium lanthanum niobate series nano powder

A nano-powder, gallium lanthanum niobate technology, applied in chemical instruments and methods, niobium compounds, gallium/indium/thallium compounds, etc., can solve the problems of easy volatility, high growth cost, and difficulty in controlling the uniformity of growth crystal components, etc. problem, achieve the effect of improving the uniformity of components, solving the volatilization of components, and reducing the temperature

Inactive Publication Date: 2008-06-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Due to Ga 2 o 3 Easy to volatilize, and the composition uniformity of the grown crystal is not easy to control
[0006] 3. Due to the need to add excess Ga 2 o 3 , higher growth cost

Method used

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  • Method for preparing gallium lanthanum niobate series nano powder
  • Method for preparing gallium lanthanum niobate series nano powder
  • Method for preparing gallium lanthanum niobate series nano powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Accurately weigh 0.1329g Nb 2 o 5 (0.001mol) dissolved in 5ml of concentrated hydrofluoric acid (analytical grade) solution, magnetically stirred at 70°C in a water bath for 2h until Nb 2 o 5 completely dissolved.

[0029] 2. Prepare 4g of ammonium oxalate into an aqueous solution, add it to the solution described in 1, and stir to mix evenly.

[0030] 3. Add ammonia water to the above solution to form white Nb(OH) 5 Precipitate, until the precipitation is complete, the detection pH value is about 10.

[0031] 4. Add 2 g of citric acid until the citric acid is fully dissolved to form a pale yellow Nb-citric acid solution.

[0032] 5. Accurately weigh 0.9774gLa 2 o 5 Dissolved in nitric acid (analytical grade) to form La(NO 3 ) 3 (0.006mol) solution, weigh 3.2048gGa(NO 3 ) 3 ·xH 2O (Ga%=23.93%) was formulated into a solution, and the above two solutions were mixed and then added to the Nb-citric acid solution.

[0033] 6. Add 9.3476g of citric acid into t...

Embodiment 2

[0043] As described in Example 1, the difference is that the calcination temperature is 750° C. to obtain nanoscale LGN powder.

Embodiment 3

[0045] As described in Example 1, the difference is that the ratio of metal cations to citric acid is 1:4 to obtain nanoscale LGN powder.

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Abstract

A preparation method of nanometer powder of langanite series pertains to the technical field of the preparation of crystal growth material. The nanometer powder series comprises La3Ga5.5Nb0.5O14 (LGN), La3Ga5.5Ta0.5O14 (LGT) and La3Ga5SiO14 (LGS). The invention adopts citrate gel method to prepare the nanometer powder at a low temperature. Nb2O5, Ta2O5 or SiO2 is dissolved in concentrated hydrofluoric acid and then ammonium oxalate and ammonia are added to form sediment which is then dissolved in citrate solution. Gallium nitrate solution and lanthanum nitrate solution are then added and next the citrate is added and mixed evenly; then the gel is obtained after the solution is heated; the gel is kept at certain temperature to obtain foam-shaped fluffy solid which is calcined to obtain the nanometer powder. The synthesis of the method of the invention can be done at the low temperature to obtain the nanometer powder of langanite series with comparatively higher purity as the raw material for crystal growth, which dramatically improves the uniformity of the components of the crystal and reduces the cost of crystal growth.

Description

(1) Technical field [0001] The invention relates to a synthesis method of raw material powder for crystal growth, in particular to a preparation method of gallium lanthanum niobate series nano-powders, and belongs to the technical field of crystal growth raw material preparation. (2) Background technology [0002] Gallium lanthanum niobate series crystals have excellent piezoelectric properties and are widely used in radio frequency control devices (resonators) nuclear selection devices (filters), and are key components in electronic equipment, telemetry navigation and communication systems. The series of crystals include La 3 Ga 5.5 Nb 0.5 o 14 (LGN), La 3 Ga 5.5 Ta 0.5 o 14 (LGT), La 3 Ga 5 SiO 14 (LGS). Regarding the growth of this series of crystals, the current methods and previous reports are mostly: (1) high-purity oxides are directly mixed and heated to form a high-temperature melt, and then crystal growth is carried out; (2) solid-state reaction method at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C01G33/00C01G15/00
Inventor 袁多荣于法鹏段秀兰郭世义程秀凤王丽华
Owner SHANDONG UNIV
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