A method for preparing indium-niobium co-doped titanium dioxide powder by co-precipitation

Abstract

The invention relates to a method for preparing indium niobium co-doped titanium dioxide powder through a co-precipitation method. The method comprises the following steps: (1) preparing a solution, weighting InCl3.4H2O and NbCl and respectively dissolving in absolute ethyl alcohol, thereby obtaining an InCl3 solution and a NbCl5 solution; (2) weighting TiCl4 and dissolving in absolute ethyl alcohol, thereby obtaining a TiCl4 absolute ethyl alcohol solution; (3) dropwise adding the InCl3 solution into the NbCl5 solution, thereby obtaining a mixed solution A; (4) dropwise adding the TiCl4 absolute ethyl alcohol solution into the mixed solution A, thereby obtaining a mixed solution B; (5) using ammonium hydroxide for adjusting pH of the mixed solution B till pH is more than or equal to 11, thereby forming a suspension; (6) performing suction filtration on the suspension, drying the obtained precipitate, grinding and sieving, thereby obtaining precursor powder; (7) roasting the precursor powder prepared in the step (6) at 1100-1200 DEG C, thereby obtaining the indium niobium co-doped titanium dioxide powder.

Description

technical field [0001] The invention belongs to the technical field of powder preparation by wet chemical method, in particular to a method for preparing indium niobium co-doped titanium dioxide powder by co-precipitation method. Background technique [0002] In recent years, modern communication technology, Internet, local area network and microelectronic technology have been continuously developed, and electronic technology has been widely used in national defense, science, industry, medicine, communication (information processing, transmission and communication), radio, television, aviation, navigation, radio Various fields such as positioning, automatic control, remote control and telemetry, computer and cultural life play an important role in promoting the development of the national economy. This rapid development has put forward higher requirements for the size and performance of capacitive devices such as capacitors and memories. The dielectric material is becoming t...

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Problems solved by technology

[0009] (1) The solid-state reaction generally needs to be carried out at a higher temperature, which wastes energy, and the fusion and growth of particles will also occur, which is not conducive to the formation of ultrafine powder;

[0010] (2) Since the solid phase reaction is carried out on the particle interface, the reaction is often incomplete and the composition is not uniform;

[0011] (3) Solid-phase doping is difficult to be uniform, especially when a small amount of doping (0.1% to 1%), it is impossible to achieve complete uniformity;

[0012] (4) The traditional solid-phase method is easy to introduce other impurities, resulting in very low purity of the obtained powder;

[0013] (5) The powder produced by solid state reaction is prone to agglomeration

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