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A technology of magnesium niobate and magnesium oxide, which is applied in chemical instruments and methods, niobium compounds, inorganic chemistry and other directions, can solve the problems of low efficiency of synthesis process, insufficient power, low yield and the like, and achieves simple preparation method, low cost and high efficiency. high effect
Inactive Publication Date: 2009-02-18
EAST CHINA NORMAL UNIV
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However, the traditional high-energy ball milling mechanochemical method, based on the design of crushing theory, seems powerless in the synthesis of new inorganic non-metallic materials. Synthesizing an inorganic non-metallic solid material often requires tens of hours of ball milling
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Embodiment 1
[0011] a), weigh MgO 10.0689g, Nb 2 o 5 66.3723 g.
[0012] b) Grind and mix the above-mentioned substances in a mortar evenly.
[0013] c), put it into the screw grinder, set the inverter frequency parameter to 30HZ, grind for 11 hours to get MgNb 2 o 6 .
Embodiment 2
[0015] a), weigh MgO 10.1256g, Nb 2 o 5 66.8547g.
[0016] b) Add 20ml of deionized water as a solvent to the above-mentioned substances (the amount added should be such that the mixture can be uniformly dispersed), and grind and mix them evenly in a mortar.
[0017] c) Put the mixture into an oven and bake at 80° C. for 2 hours.
[0018] d), put it into the screw grinder, set the inverter frequency parameter to 40HZ, grind for 8 hours to get MgNb 2 o 6 .
Embodiment 3
[0020] a), weigh MgO 10.2564g, Nb 2 o 5 66.5782 g.
[0021] b) Add 20ml of deionized water as a solvent to the above-mentioned substances (the amount added should be such that the mixture can be uniformly dispersed), and grind and mix them evenly in a mortar.
[0022] c) Put the mixture into an oven and bake at 100° C. for 1.5 hours.
[0023] d), put it into the screw grinder, set the inverter frequency parameter to 50HZ, grind for 5 hours to get MgNb 2 o 6 .
[0024] From attached Figure 1-2 It can be seen that the obtained MgNb 2 o 6 The reaction time is short, the phase is pure, the particles are small, and the dispersion is good.
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Abstract
The invention discloses a method for preparing magnesium niobium oxide, which comprises the following steps: magnesium oxide (MgO) is mixed with niobium pentaoxide (Nb2O5) according to the dose of the mole ratio of 1:1, and the mixture is arranged inside a screw grinding machine to be ground for 6 to 11 hours; or after the magnesium oxide (MgO) is mixed with niobium pentaoxide (Nb2O5) at the same proportional ratio, the mixture is added with de-ionized water that can dip the mixture, and after the mixed solution is ground and uniformly mixed in a mortar, and the mixture is arranged into an oven to be dried until the mixture is slightly dry in the temperature of 80 to 100 DEG C; the slight dried mixture is ground in the screw grinding machine for 5 to 8 hours to get the magnesium niobium oxide with the ordinary chemical formula of MgNb2O6. The prepared magnesium niobium oxide can be reacted with lead monoxide to synthesize the magnesium niobium oxide lead iron electrical material, thus can greatly shorten the reaction time of the synthesis, and also can effectively prevent the volatilization of the lead composition in the reaction process, and can realize the pollution-free chemical reaction. The invention has the advantages of simple craftwork, easy operation, short preparation time, pure material phase, good dispersion, uniform particles, and the like.
Description
technical field [0001] The invention relates to the preparation of ferroelectric materials, in particular to a preparation technology of magnesium niobate. Background technique [0002] Magnesium niobate (MN) is the precursor in the porcelain powder of lead magnesium niobate base MLCC, in the prior art, it is passed niobium pentoxide (Nb 2 o 5 ) and basic magnesium carbonate high temperature solid state reaction synthesis. Not only the reaction temperature is high (~1050°C), the energy consumption is high, the process is cumbersome, and the production cost is high; and the product quality is often affected by raw materials (such as Nb 2 o 5 ) purity, particle size, so that the reaction is not complete, leading to the generation of pyrochlore phase in the next step of synthesis, and ultimately lead to the instability of the performance of the element. [0003] The mechanochemical method uses mechanical energy to activate raw materials, resulting in changes in the structur...
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