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Method for preparing large-size lanthanum gallium silicate crystals in batches

A technology of lanthanum silicate and large size is applied in the field of batch preparation of large size lanthanum silicate crystals to achieve the effects of reducing processing loss and man-hours, low equipment cost and low energy consumption

Active Publication Date: 2020-04-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing methods for preparing lanthanum gallium silicate crystals, the purpose of the present invention is to provide a relatively low-cost, stable and reliable method for preparing large-scale lanthanum gallium silicate crystals in batches, thereby promoting the development of lanthanum gallium silicate crystals. Wide application of crystals in the field of surface acoustic wave technology

Method used

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  • Method for preparing large-size lanthanum gallium silicate crystals in batches
  • Method for preparing large-size lanthanum gallium silicate crystals in batches
  • Method for preparing large-size lanthanum gallium silicate crystals in batches

Examples

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Effect test

Embodiment 1

[0040] High purity La 2 o 3 , Ga 2 o 3 and SiO 2 The molar ratio of the powder is 3:5(1+x):(1-y) ingredients (x=0~0.008, y=0~0.01), with alcohol and agate balls as the mixing medium, at 60 rpm Mixed by wet ball milling for 20 hours, then dried, isostatically pressed into a dense cylindrical block, and sintered at 1300°C for 15 hours. The obtained polycrystalline blocks were put into three platinum crucibles of Φ76.2×200mm respectively, the thickness of the crucible was 0.3mm, and the orientation seed crystal of Φ76.2×50mm was placed on the bottom of the crucible in advance, and placed in the descending furnace Position, the furnace temperature is controlled at 1510°C, the crucible drops at a rate of 0.4mm / h after the top of the seed crystal is melted and kept for 8 hours, and the furnace temperature is raised at a rate of 1.5°C / day. After 18 days of growth, all the raw materials crystallize and stop falling. The furnace temperature is slowly lowered to 400°C at a rate of...

Embodiment 2

[0042] High purity La 2 o 3 , Ga 2 o 3 and SiO 2 The molar ratio of the powder is 3:5(1+x):(1-y) ingredients (x=0~0.008, y=0~0.01), with alcohol and agate balls as the mixing medium, at 60 rpm Mixed by wet ball milling for 20 hours, then dried, isostatically pressed into a dense cylindrical block, and sintered at 1300°C for 15 hours. The obtained polycrystalline material blocks were put into three platinum crucibles of Φ76.2×200mm respectively, the thickness of the crucible was 0.3mm, and a Φ76.2×50mm The oriented seed crystal is placed in a proper position in the descending furnace, the furnace temperature is controlled at 1520°C, the top of the seed crystal is melted and kept for 5 hours, the crucible is lowered at a rate of 0.4mm / h, and the furnace temperature is raised at a rate of 1.5°C / day. After 18 days of growth, all raw materials crystallize and stop falling. The furnace temperature is slowly cooled to 400°C at a rate of 20°C / h, and then cooled to room temperatu...

Embodiment 3

[0044] High purity La 2 o 3 , Ga 2 o 3 and SiO 2 The molar ratio of the powder is 3:5(1+x):(1-y) ingredients (x=0~0.01, y=0~0.01), with alcohol and agate balls as the mixing medium, at 60 rpm Mixed by wet ball milling for 20 hours, then dried, isostatically pressed into a dense cylindrical block, and sintered at 1350°C for 10 hours. The obtained polycrystalline blocks were put into three platinum crucibles of Φ101.6×200mm respectively, the thickness of the crucible was 0.4mm, and the orientation seed crystal of Φ101.6×50mm was placed on the bottom of the crucible in advance, and placed in the descending furnace Position, the furnace temperature is controlled at 1510°C, the top of the seed crystal is melted and kept for 10 hours, the crucible is lowered at a rate of 0.35mm / h, and the furnace temperature is raised at a rate of 2°C / day. After 20 days of growth, all the raw materials crystallize and stop falling. The furnace temperature is slowly cooled to 400°C at a rate of...

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Abstract

The invention relates to a method for preparing large-size lanthanum gallium silicate crystals in batches. The method comprises the following steps of: (1) weighing La2O3 powder, Ga2O3 powder and SiO2powder according to a molar ratio of 3: 5(1 + x): (1-y), adding agate balls or zirconia balls and alcohol as a mixing medium, carrying out wet ball-milling mixing, drying, briquetting and sintering to obtain a raw material block, (2) putting seed crystals into the bottom of at least one crucible, then putting raw material blocks into the crucible, and sealing the crucible. (3) putting at least one crucible into a crucible descending furnace, and then keeping the temperature at 1500-1530 DEG C for 5-10 hours to melt the tops of the raw material blocks and the seed crystals, and (4) conductingreduction at a rate of 0.1-0.5 mm / h, keeping the growth temperature at a heating rate of 1-3 DEG C / min, stopping reducing until the raw material block is completely crystallized, and cooling to room temperature to obtain the large-size lanthanum gallium silicate crystal.

Description

technical field [0001] The invention relates to a method for preparing large-sized gallium lanthanum silicate crystals in batches, belonging to the field of crystal growth. Background technique [0002] Surface Acoustic Wave (SAW) is a type of elastic wave that propagates along the surface of an object, discovered by British physicist Rayleigh in the 1880s while studying seismic waves. With the deepening of people's understanding of this wave, especially the invention of the interdigital transducer that can excite surface acoustic waves on the surface of piezoelectric materials in 1965, it greatly promoted the development and application of surface acoustic technology. A variety of electronic devices have been produced using surface acoustic wave technology, and have been widely used in communications, radar, sonar, electronic countermeasures, and microwave relay. For example, the most commonly used filters in mobile phones and many wireless communication terminals are surf...

Claims

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Application Information

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IPC IPC(8): C30B29/34C30B15/08
CPCC30B15/08C30B29/34
Inventor 王升郑燕青熊开南涂小牛殷利斌孔海宽施尔畏
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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