Batch synthesis method of lithium niobate uniformly-doped polycrystal material

A technology of magnesium lithium niobate, chemical synthesis, applied in niobium compounds, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of soil environmental pollution, cumbersome preparation process, unsuitable for batch crystal production, etc. The effect of volatilization, low sintering temperature and energy saving

Active Publication Date: 2014-07-16
SHANDONG UNIV
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Problems solved by technology

This method can realize the uniform doping of magnesium ions in the basic research stage of high-quality magnesium-doped lithium niobate crystals, which has a great effect on the improvement of crystal quality, but because the preparation process is cumbersome, it needs to be dissolved with high-temperature hydrochloric acid Niobium oxide is neutralized with a large amount of ammonia water, resulting in high preparation costs for polycrystalline materials, which are not suitable for batch crystal production, and will cause certain pollution to the soil environment

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  • Batch synthesis method of lithium niobate uniformly-doped polycrystal material

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Embodiment 1

[0024] Synthesis of 1mol% Magnesium Doped Stoichiometric Lithium Niobate Polycrystalline Material

[0025] (1) Weigh 0.303g of MgO powder, add it to 30mL of 1mol / L citric acid solution, heat and stir until boiling, so that MgO is fully dissolved, and a stable transparent solution is obtained.

[0026] (2) Add deionized water to the solution obtained in step (1) until the total liquid volume is 200mL, add 1.5mL dispersant Tween 80 after cooling, and then adjust the pH value to 10 by adding ammonia water dropwise.

[0027] (3) Weigh 100g of niobium oxide and 38.388g of lithium carbonate, add them to the solution obtained in step (2), and ball mill the obtained suspension for 2 hours (the balls are selected as lithium niobate crystal balls) to achieve two solid phases Uniform and stable mixing of powder and magnesium ion solution. Using spray drying technology, the uniformly mixed solid phase and liquid phase substances are solidified (the temperature of the air inlet during spr...

Embodiment 2

[0030] Synthesis of 5mol% Mg-doped lithium niobate polycrystalline material with the same composition

[0031] (1) Weigh 1.516g of MgO powder, add it to 150mL of 1mol / L citric acid solution, heat and stir until boiling, so that MgO is fully dissolved, and a stable transparent solution is obtained.

[0032] (2) Add deionized water to the solution obtained in step (1) until the total liquid volume is 200mL, add 2mL dispersant Tween 80 after cooling, and then adjust the pH value to 10 by adding ammonia water dropwise.

[0033] (3) Weigh 100g of niobium oxide and 26.284g of lithium carbonate, add them to the solution obtained in step (2), and conduct ball milling on the obtained suspension for 5 hours (the balls are selected as lithium niobate crystal balls) to achieve two solid phases Uniform and stable mixing of powder and magnesium ion solution. Using spray drying technology, the uniformly mixed solid phase and liquid phase substances are solidified (the temperature of the air...

Embodiment 3

[0036] Synthesis of 6mol% Mg-doped lithium niobate polycrystalline material with the same composition

[0037](1) Weigh 1.819g of MgO powder, add it into 180mL of 1mol / L citric acid solution, heat and stir until boiling, so that MgO is fully dissolved, and a stable transparent solution is obtained.

[0038] (2) Add deionized water to the solution obtained in step (1) until the total liquid volume is 200mL, add 1.0mL dispersant Tween 80 after cooling, and adjust the pH value to 11 by adding ammonia water dropwise.

[0039] (3) Weigh 100g of niobium oxide and 26.284g of lithium carbonate, add them to the solution obtained in step (2), and ball mill the obtained suspension for 4 hours (the balls are selected as lithium niobate crystal balls) to achieve two solid phases Uniform and stable mixing of powder and magnesium ion solution. Using spray drying technology, the uniformly mixed solid phase and liquid phase substances are solidified (the temperature of the air inlet during sp...

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Abstract

The invention relates to a batch synthesis method of a lithium niobate uniformly-doped polycrystal material, belonging to the field of inorganic material preparation. The method comprises the following steps of dissolving magnesium oxide into organic acid to sufficiently react with organic acid to form colorless and transparent solution; then adding a certain proportion (stoichiometric or identical component) of niobium oxide and lithium carbonate nano particles, uniformly mixing by using a ball-milling technology to form a suspension; carrying out spray drying on the suspension to obtain doped lithium niobate polycrystal precursor, wherein the precursor particle is a nano particle formed by uniformly doping magnesium ions into niobium oxide and lithium carbonate; and finally, carrying out low-temperature sintering on the precursor to obtain granular lithium niobate uniformly-doped polycrystal material with uniform components. According to the invention, used raw materials are conventional materials, and niobium oxide and lithium carbonate are more uniformly mixed in the solution. The method is suitable for synthesis of other doped raw materials and has universality.

Description

technical field [0001] The invention relates to a method for synthesizing polycrystalline raw materials doped with lithium niobate, in particular to a method for synthesizing polycrystalline materials uniformly doped with lithium niobate, which belongs to the field of inorganic material preparation. Background technique [0002] Lithium niobate crystal is an excellent multifunctional crystal with excellent piezoelectric properties, electro-optic effect, photorefractive effect, pyroelectric effect and nonlinear optical properties. Various functional devices can be prepared according to their different properties, such as surface filters, electro-optical switches, holographic memory, pyroelectric detectors in infrared technology, etc. Lithium niobate crystal is also a ferroelectric crystal, and the periodically polarized domain structure prepared according to the principle of quasi-phase matching can realize the frequency conversion function from ultraviolet light to mid-infra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 桑元华孙德辉康学良梁龙跃王东周冯彧乔永军刘宏
Owner SHANDONG UNIV
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