CN1609045A

CN1609045A - Prepn process of non-aggregate nanometer doped YAG powder

Info

Publication number: CN1609045A
Application number: CN 200310103712
Authority: CN
Inventors: 周有福; 许颜清; 洪茂椿; 陈长章; 李定
Original assignee: Fujian Institute of Research on the Structure of Matter of CAS
Current assignee: Fujian Institute of Research on the Structure of Matter of CAS
Priority date: 2003-10-23
Filing date: 2003-10-23
Publication date: 2005-04-27
Anticipated expiration: 2023-10-23
Also published as: CN100469735C

Abstract

The present invention belongs to the field of fine chemical technology, and features that the doped YAG powder is prepared with Y, Al and doping RE nitrate aqua as material and ammonium bicarbonate as precipitant and through precipitation, filtering, drying, and calcining at 900-1300 deg.c. The preparation process of the doped YAG powder with no aggregate, no hetero phase, high purity, narrow size distribution about 30 nm has the preparation process with no inorganic salt added, no surfactant added and no vacuum drying and freeze drying adopted. The preparation process is stable, low in cost, high in powder quality and suitable for large-scale production.

Description

A kind of preparation method who does not have reunion doped yttrium aluminum garnet nano-powder

Technical field

The invention belongs to field of fine chemical, especially relate to the preparation method of doped yttrium aluminum garnet nano-powder.

Background technology

Yttrium aluminum garnet (YAG) crystal is a kind of laser medium material of excellent property, and growth YAG crystal needs specific installation and complicated technology, and crystalline size is limited; Owing to dephlegmation, the concentration of doping active ions-rare earth ion can not be too big, influences the raising of laser-conversion efficiency simultaneously.The polycrystalline transparent ceramic cost is lower, prepares large size bulk and high-concentration dopant ion easily, thereby transparent YAG pottery becomes the very potential substituent of YAG crystalline.Prepare the high-quality doping YAG of transparent doping YAG pottery needs powder, i.e. little, the narrow diameter distribution of powder purity height, particle diameter, nothing reunion.Help reducing void content like this, improve the density and the optical property of pottery.YAG also has excellent high-temperature creep resistance except being widely used as laserable material, is a kind of very promising high temperature resistant structure ceramics.

The method for preparing the YAG powder both at home and abroad mainly contains mixed calcining method, hydrothermal method, sol-gel method, the precipitator method etc.But the method that lacks a kind of suitable scale operation.As the mixed calcining method is Y ₂O ₃And Al ₂O ₃Be mixed in proportion, just obtain the YAG powder 1800 ℃ of calcinings, its particle is big and reunite serious.Hydrothermal method yields poorly and purity difference.The sol-gel fado adopts alkoxide to make raw material, or adopts citric acid to make jelling agent, and cost is higher, is not suitable for scale operation.The precipitator method are the methods that early are used for preparing the YAG powder, and its advantage is that cost is low, but powder reuniting is serious, generally adopt ammoniacal liquor to make precipitation agent or urea is made coprecipitator, and often add tensio-active agent, vacuum-drying or lyophilize and overcome agglomeration traits.The bicarbonate of ammonia of employing is also arranged as precipitation agent, but do not introduce ammonium sulfate as auxiliary agent, effect is not ideal.

Summary of the invention

The purpose of this invention is to provide a kind of scale operation does not have the method for the doping YAG nano-powder of reunion, no dephasign.The present invention adopts following technical scheme:

1, the powder composition formula of the present invention's preparation is Y _3-XRe _XAl ₅O ₁₂, Re is a doped with rare-earth elements, and the inorganic salt solution of doping with rare-earth ions and yttrium, aluminum ions inorganic salt solution are mixed, and generates precipitation.

Yttrium, aluminium and doping with rare-earth ions are selected analytical pure inorganic salt separately for use, and the inorganic salt of yttrium can be with 99.99% Y ₂O ₃Be dissolved in dense HNO ₃In and make.Do not select hydrochloride for use, can avoid its chlorion to increase the reunion of powder.The metal ion mol ratio of these three kinds of ionic inorganic salt solutions is 3-X: X: 5 (0≤X≤1), the concentration of yttrium, aluminium and doping with rare-earth ions is 0.5-0.005mol/L.The concentration of above-mentioned three kinds of ionic inorganic salt solutions should be controlled at certain limit, and the excessive concentration powder is easy to generate reunion, and it is low that concentration is crossed low-yield.

Aforementioned doping with rare-earth ions, yttrium and the aluminum ions inorganic salt solution preferably nitrate aqueous solution.

Do not add any auxiliary agent and can obtain the nanoscale powder yet, can improve the precipitation dispersiveness, reduce diameter of particle but add ammonium sulfate.Addition is about the 0-20% of ruthenium ion molar weight.

2, the pH value is controlled at 5-9 in the precipitation process, and stirs, and guarantees rare earth ion and aluminum ion precipitation fully.Precipitation agent adopts ammonium bicarbonate aqueous solution, and concentration is 0.5-0.005mol/L.

3, sedimentary suction filtration: earlier using deionized water wash in the suction filtration process, is in order to remove impurity, as chlorion etc., chlorion can increase the reunion of powder, organic solvent washing is used in washing back, is in order to reduce the hydroxide ion of absorption, and hydroxide ion can increase the reunion of powder.The present invention selects for use dehydrated alcohol to make the organic solvent lotion.

4, drying: the exsiccant purpose is in order to remove the moisture and the organic solvent of precipitation absorption, in a conventional oven temperature 100-120 ℃ dry 2-6 hour.

5, calcining: calcining is in order to be transformed into oxide compound generating carbonate and class carbonate deposition, thermal treatment temp is low excessively, YAG changes not exclusively mutually, produce dephasign, thermal treatment temp is too high, the YAG grain growing, and it is big that particle scale becomes, therefore thermal treatment temp is controlled at 900-1300 ℃, and the time was controlled at 2-6 hour.

Use method provided by the invention, the particle diameter of the no reunion doped yttrium aluminum garnet nano-powder of preparation is the 20-100 nanometer.

Fig. 1 is that median size is the powder x-ray diffraction figure of the neodymium-doped YAG powder of 30 nanometers, compares with following YAG crystal mimic powder x-ray diffraction figure, and all characteristic peaks are Y ₃Al ₅O ₁₂Y does not appear in phase ₄Al ₂O ₉And YAlO ₃Wait other dephasign; Fig. 2 is that median size is the electron diffraction photo of the neodymium-doped YAG powder of 30 nanometers, and point diffraction is clear, shows YAG phase complete in crystal formation; Fig. 3 is that median size is the transmission electron microscope photo of the neodymium-doped YAG powder of 30 nanometers, essentially no reunion.

Compared with prior art, the present invention has following advantage: preparation technology is simple, and is low for equipment requirements, and processing parameter is easy to control, needn't vacuum-drying; Raw material is nitrate, and cost is low, compares with the hydrochloride raw material, has reduced the degree of powder reuniting; The purity height of powder, particle diameter is little, does not have and reunites; Doping with rare-earth ions is easy, and is effective.

Description of drawings

Fig. 1 is that median size is the comparison of the neodymium-doped YAG powder and the YAG crystal mimic powder x-ray diffraction figure of 30 nanometers, wherein goes up the powder x-ray diffraction figure of collection of illustrative plates for the neodymium-doped YAG powder of measurement, and following collection of illustrative plates is YAG crystal mimic powder x-ray diffraction figure.

Fig. 2 is that median size is the electron diffraction photo of the neodymium-doped YAG powder of 30 nanometers.

Fig. 3 is that median size is the transmission electron microscope photo of the neodymium-doped YAG powder of 30 nanometers.

Embodiment

Example 1:

Y (NO ₃) ₃And Al (NO ₃) ₃Be dissolved in respectively in the distilled water, yttrium and aluminum ions concentration are respectively 0.3mol/L and 0.5mol/L, are these two kinds of solution mixing in 3: 5 by metal ion mol ratio, stir down, be added dropwise to (concentration is 0.5mol/L) in the excessive ammonium bicarbonate soln, get gelatinous precipitate after finishing, the pH value is about 8.Suction filtration, distillation washing 2 times, dehydrated alcohol is washed 2 times, 110 ℃ of dryings 4 hours, grinds, and sieves, be placed on then in the High Temperature Furnaces Heating Apparatus, 1200 ℃ of calcinings 4 hours, the median size that obtains pure YAG powder is 50 nanometers.

Example 2:

Y (NO ₃) ₃, Nd (NO ₃) ₃And Al (NO ₃) ₃Be dissolved in the distilled water respectively, yttrium, neodymium and aluminum ions concentration are respectively 0.3mol/L, 0.1mol/L and 0.5mol/L, is these three kinds of solution mixing in 2.9: 0.1: 5.0 by metal ion mol ratio, stir down, be added dropwise to (concentration is 0.5mol/L) in the excessive ammonium bicarbonate soln, get gelatinous precipitate after finishing, the pH value is about 8.Suction filtration, distillation washing 2 times, dehydrated alcohol is washed 2 times, 110 ℃ of dryings 4 hours, grinds, and sieves, be placed on then in the High Temperature Furnaces Heating Apparatus, 1200 ℃ of calcinings 4 hours, the median size that obtains neodymium-doped YAG powder is 50 nanometers.X-ray fluorescence analysis (XRF) shows molar concentration rate (atom%) Y of yttrium and neodymium element in the powder: Nd is about 30: 1.

Example 3:

Y (NO ₃) ₃, Nd (NO ₃) ₃And Al (NO ₃) ₃Be dissolved in the distilled water respectively, yttrium, neodymium and aluminum ions concentration are respectively 0.3mol/L, 0.1mol/L and 0.5mol/L, is these three kinds of solution mixing in 2.9: 0.1: 5.0 by metal ion mol ratio, and add 0.1mol/L ammoniumsulphate soln (addition be about ruthenium ion molar weight 10%), and stir down, be added dropwise to (concentration is 0.5mol/L) in the excessive ammonium bicarbonate soln, get gelatinous precipitate after finishing, the pH value is about 8.Suction filtration, distillation washing 2 times, dehydrated alcohol is washed 2 times, 110 ℃ of dryings 4 hours, grinds, and sieves, be placed on then in the High Temperature Furnaces Heating Apparatus, 1200 ℃ of calcinings 4 hours, the median size that obtains neodymium-doped YAG powder is 30 nanometers.X-ray fluorescence analysis (XRF) shows molar concentration rate (atom%) Y of yttrium and neodymium element in the powder: Nd is about 30: 1.

Claims

1, a kind of preparation method who does not have reunion doped yttrium aluminum garnet nano-powder, it comprises precipitation, suction filtration, drying, calcination process, it is characterized in that:

(1) composition formula of doped yttrium aluminum garnet is Y _3-XRe _XA _L5O ₁₂Re is a doped with rare-earth elements, selecting the corresponding separately inorganic salt solution of yttrium, aluminium and doping with rare-earth ions for use is raw material, and the concentration of yttrium, aluminium and doping with rare-earth ions is 0.5-0.005mol/L, and the metal ion mol ratio of these three kinds of inorganic salt solutions is 3-X: X: 5 (0≤X≤1);

(2) adopting ammonium bicarbonate aqueous solution is precipitation agent, and concentration is 0.5-0.005mol/L;

(3) precipitation process is followed stirring, and control pH value is 5-9.

2, preparation method as claimed in claim 1 is characterized in that: described precipitation process adopts ammonium sulfate as auxiliary agent, and addition is the 0-20% of ruthenium ion molar weight.

3, preparation method as claimed in claim 1 is characterized in that: described inorganic salt solution is the nitrate aqueous solution of yttrium, aluminium and doping with rare-earth ions, does not adopt its aqueous chloride solution.