Dual-niobium-source alkali metal niobate micro-nano wire material and preparation method thereof
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An alkali metal niobate and micro-nano technology, which is applied in the field of micro-nano materials, can solve problems such as high energy consumption, equipment requirements, production safety issues, affecting powder activity, and increased production costs, so as to shorten the holding time, Improve crystallinity and save cost
Active Publication Date: 2019-03-01
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
[0005] 1. Due to the early experimental experience in this field, it was found that using pure water as the ball milling medium will cause agglomeration and affect the activity of the powder. Therefore, the conventional method in this field is to use absolute ethanol as the ball milling medium, and absolute ethanol as the ball milling medium The medium directly leads to the increase of production cost, safety hazards in the production process, and environmental pollution problems;
[0006] 2. The pre-burning temperature is relatively high, which needs to reach 700-900 ℃. Obviously, higher temperature conditions bring higher energy consumption, equipment requirements and production safety issues
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Embodiment 1
[0030] A preparation method of a double niobium source alkali metal niobate micro-nano wire material:
[0031] Step (1) All raw materials K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 、C 10 h 5 NbO 20 、BaCO 3 、 Bi 2 o 3 Before weighing the ingredients, they are all placed in an oven for drying, and the drying temperature is 120°C;
[0032] Step (2) according to the chemical formula (1- y )K z Na 1-z Nb (c)xNb(N)1-x o 3 - y BaBiO 3 Component mass ratio Weighing raw materials, where Nb （C） means from C 10 h 5 NbO 20 Nb element; Nb （N） means from Nb 2 o 5Nb element of ; x = 0.01, y = 0.05, z = 0.54. Put it into a ball mill bottle, and use purified water and zirconia balls as the medium for ball milling for 24 hours;
[0033] Step (3) The powder after ball milling is taken out, dried, and pre-fired. The pre-fired temperature is 200°C for 3 hours, then raised to 500°C for 3 hours, and the heating rate is 1min / °C;
[0034] Step (4) Then put the pre-fired powder into the ...
Embodiment 2
[0039] A preparation method of a double niobium source alkali metal niobate micro-nano wire material:
[0040] The steps that are not specifically described are the same as the preparation method of Example 1, except that in step (6), the heat preservation treatment is carried out for 18 hours.
[0041] Through SEM detection, the obtained double niobium source alkali metal niobate micro-nano wire material.
Embodiment 3
[0043] A preparation method of a double niobium source alkali metal niobate micro-nano wire material:
[0044] The steps that are not specifically described are the same as the preparation method of Example 1, except that in step (6), the heat preservation treatment is carried out for 24 hours.
[0045] After SEM detection, the obtained double niobium source alkali metal niobate micro-nano wire material is as follows: image 3 shown.
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Abstract
The invention discloses a dual-niobium-source alkali metal niobate micro-nano wire material. The micro-nano wire material is synthesized through a traditional ceramic solid-phase sintering process byusing K2CO3, Na2CO3, Nb2O5, C10H5NbO20, BaCO3 and Bi2O3 as raw materials which are blended according to a chemical formula of (1-y)K<z>Na<1-z>Nb<(C)x>Nb<(N)1-x>O<3-y>BaBiO<3>, wherein Nb<(C)> is an element Nb from a niobium source C<10>H<5>NbO<20>, Nb<(N)> is an element Nb from a niobium source Nb<2>O<5>, x is greater than 0 and less than or equal to 0.1, y is greater than 0 and less than 0.1, andz is greater than or equal to 0.4 and less than or equal to 0.6. A preparation method of the dual-niobium-source alkali metal niobate micro-nano wire material comprises the following steps of (1) rawmaterial drying; (2) raw material weighing and ball-milling; (3) pre-sintering of powder obtained after ball-milling; (4) secondary ball-milling of pre-sintered powder; (5) pressing of powder obtained after secondary ball-milling into a round billet; (6) heat preservation treatment of the round billet. The dual-niobium-source alkali metal niobate micro-nano wire material and the preparation method thereof have the advantages that after the double niobium sources are adopted, the crystallinity of pressed billet powder and the growth speed of micro-nano wires can be effectively increased; meanwhile, purified water can be used as a ball-milling medium, no absolute ethyl alcohol is needed, and thus the cost is greatly saved and environment pollution and potential safety hazards in the dryingprocess are reduced; the pre-sintering temperature is lowered by 150-425 DEG C, and heat preservation time is shortened.
Description
technical field [0001] The invention relates to the field of micro-nano materials and technology, in particular to a double niobium source alkali metal niobate micro-nano wire material and a preparation method thereof. Background technique [0002] One-dimensional lead-free perovskite materials, including nanowires, nanorods, and nanotubes, have shown unprecedented application prospects in various fields of environmental protection, energy, biomedicine, national defense, and daily life. At present, many nanomaterials have been synthesized by various methods, such as nanowires, nanorods, nanorods, and nanobelts. The methods for synthesizing micro-nano materials mainly include hydrothermal method, molten salt method, sol-gel method, template method, etc., but each method has certain problems. The template growth method can control the shape and size of nanomaterials, the synthesis method is simple, and it is suitable for mass production, etc., but impurities are easily introd...
Claims
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