Preparation method of pyrochlore type rare-earth titanate powder

Abstract

The invention discloses a preparation method of pyrochlore type rare-earth titanate powder. The preparation method adopts a soft chemical sol-gel method to prepare and comprises the following specificsteps: (1) weighing rare-earth nitrate powder and alcoholate of titanium respectively according to a stoichiometric ratio; (2) dissolving the rare-earth nitrate raw material into absolute ethyl alcohol at room temperature to obtain a solution A; adding acetylacetone and the alcoholate of titanium into the absolute ethyl alcohol at the same time to obtain a solution B; mixing the solution A and the solution B to obtain transparent sol; dropwise adding a diluted nitric acid solution into the transparent sol under the condition that the temperature is 40 to 60 DEG C and continuously stirring; monitoring the pH (Potential of Hydrogen) value; stopping dropwise adding until the pH value is 4.0 to 5.0; standing for 15 to 30min to obtain transparent wet gel; (3) drying the wet gel for 12 to 24h under the condition that the temperature is 100 to 120 DEG C; grinding to obtain powder; (4) putting the powder into a muffle furnace; keeping heat for 2 to 4h under the condition that the temperatureis 750 to 850 DEG C, so as to obtain the pyrochlore type rare-earth titanate powder. The preparation method disclosed by the invention has the advantages of simple preparation technology and low energy consumption; the prepared powder has uniform chemical composition and high product purity.

Description

technical field [0001] The invention belongs to the field of optical materials, and relates to a rare earth titanate, in particular to a preparation method of a pyrochlore type rare earth titanate powder. Background technique [0002] Rare earth titanate (RE 2 Ti 2 o 7 ) is an important chemical product, which has a wide range of applications and researches in many fields such as photovoltaic devices, photocatalysts, water purification, and electrolytes. At present, the methods for synthesizing rare earth titanates mainly include high-temperature solid-phase synthesis, sol-gel method, ultrasonic spray pyrolysis, and pulsed laser deposition. Among them, the sol-gel method has always been popular as one of the most suitable techniques for synthesizing rare earth titanate powders. However, when using the sol-gel method to prepare titanate powder, it is difficult to control the gelation rate of the sol, and the ions cannot completely enter the network during the chemical rea...

AI Technical Summary

Problems solved by technology

However, when using the sol-gel method to prepare titanate powder, it is difficult to control the gelation rate of the sol, and the ions cannot completely enter the network during the chemical reaction complexation process, which affects the stoichiometric ratio and cannot achieve a pure phase powder. preparation of