The invention discloses a preparation method of pyrochlore-type rare earth titanate powder, which is prepared by soft-chemical sol-gel method. The specific steps are: (1) weighing rare earth nitrate powder and titanium alkoxide according to stoichiometric ratio respectively; (2) dissolving rare earth nitrate raw material in anhydrous ethanol at room temperature to obtain solution A; and (2) preparing acetylacetone by dissolving rare earth nitrate raw material into anhydrous ethanol. Titanium alkoxide was added to anhydrous ethanol at the same time to obtain solution B; solution A and solution B were mixed to obtain transparent sol; dilute nitric acid solution was dripped into transparent sol at 40-60 ~C, stirred continuously, and pH value was monitored, when pH was 4.0-5.0, the dripping was stopped and the transparent wet gel was obtained after standing for 15-30 minutes; (3) Wet gel was obtained. The gel was dried at 100-120 C for 12-24 hours and then grinded to obtain powder. (4) The pyrochlore-type rare earth titanate powder was prepared by placing the powder in a muffle furnace and holding it for 2-4 hours at 750-850 C. The invention has simple preparation process, low energy consumption, uniform chemical composition of the powder and high purity of the product.
【技术实现步骤摘要】
一种烧绿石型稀土钛酸盐粉体的制备方法
本专利技术属于光学材料领域,涉及一种稀土钛酸盐,具体涉及一种烧绿石型稀土钛酸盐粉体的制备方法。
技术介绍
稀土钛酸盐(RE2Ti2O7)是一种重要的化工产品,其在光伏器件、光催化剂、水净化、电解液等诸多领域都有着广泛的应用和研究。目前合成稀土钛酸盐的方法主要有高温固相合成法、溶胶凝胶法、超声波喷雾热解以及脉冲激光沉积等。其中,溶胶凝胶法作为合成稀土钛酸盐粉末的最适合的技术之一,一直受到人们的欢迎。然而在采用溶胶-凝胶法制备钛酸盐粉体时,溶胶凝胶化速率难以控制,其化学反应络合过程中离子不能完全进入网络,从而影响化学计量配比,无法实现纯相粉体的制备。
技术实现思路
本专利技术的目的是提供一种烧绿石型稀土钛酸盐粉体的制备方法,工艺简单,易于操作,制备周期短,所制得粉体化学组成均一。为了实现上述目的,本专利技术采用的技术方案是:一种烧绿石型稀土钛酸盐粉体的制备方法,采用软化学溶胶-凝胶法制备,其具体制备步骤如下:(1)称量:按化学通式RE2Ti2O7中各元素的化学计量比,分别称取稀土硝酸盐粉体和钛的醇盐,其中稀土硝酸盐原料的纯度高于99.99%;(2)溶胶凝胶化:①室温下,将稀土硝酸盐原料溶于无水乙醇中,稀土硝酸盐与无水乙醇的质量体积比为0.1~0.5mol:1L,搅拌20~30min,得到溶液A;②室温下,将乙酰丙酮、钛的醇盐同时加到无水乙醇中,乙酰丙酮与无水乙醇的质量体积比为0.1~0.2mol:1L,钛的醇盐与无水乙醇的质量体积比为0.05~0.15mol:1L,搅拌20~30min,得到溶液B;③将溶液A、溶液B混合,搅拌 ...
【技术保护点】
1.一种烧绿石型稀土钛酸盐粉体的制备方法,其特征在于,采用软化学溶胶‑凝胶法制备,其具体制备步骤如下:(1)称量:按化学通式RE2Ti2O7中各元素的化学计量比,分别称取稀土硝酸盐粉体和钛的醇盐,其中稀土硝酸盐原料的纯度高于99.99%;(2)溶胶凝胶化:①室温下,将稀土硝酸盐原料溶于无水乙醇中,稀土硝酸盐与无水乙醇的质量体积比为0.1~0.5mol:1L,搅拌20~30min,得到溶液A;②室温下,将乙酰丙酮、钛的醇盐同时加到无水乙醇中,乙酰丙酮与无水乙醇的质量体积比为0.1~0.2mol:1L,钛的醇盐与无水乙醇的质量体积比为0.05~0.15mol:1L,搅拌20~30min,得到溶液B;③将溶液A、溶液B混合,搅拌10~15min,得到透明溶胶;④将浓度为1~3mol/L稀硝酸溶液滴加到透明溶胶中,持续搅拌,并监测pH值,至pH为4.0~5.0时停止滴加,静置15~30min,得到透明湿凝胶,溶胶凝胶过程中保持体系温度为40~60℃;(3)干燥:将步骤(2)所得湿凝胶置于干燥箱内,在100~120℃条件下干燥12~24h,研磨后得到粉末;(4)煅烧:将步骤(3)所得粉末置于马弗 ...
【技术特征摘要】
1.一种烧绿石型稀土钛酸盐粉体的制备方法,其特征在于,采用软化学溶胶-凝胶法制备,其具体制备步骤如下:(1)称量:按化学通式RE2Ti2O7中各元素的化学计量比,分别称取稀土硝酸盐粉体和钛的醇盐,其中稀土硝酸盐原料的纯度高于99.99%;(2)溶胶凝胶化:①室温下,将稀土硝酸盐原料溶于无水乙醇中,稀土硝酸盐与无水乙醇的质量体积比为0.1~0.5mol:1L,搅拌20~30min,得到溶液A;②室温下,将乙酰丙酮、钛的醇盐同时加到无水乙醇中,乙酰丙酮与无水乙醇的质量体积比为0.1~0.2mol:1L,钛的醇盐与无水乙醇的质量体积比为0.05~0.15mol:1L,搅拌20~30min,得到溶液B;③将溶液A、溶液B混合,搅拌10~15min,得到透明溶胶;④将浓度为1~3mol/L稀硝酸溶液滴加到透明溶胶中,持续搅拌,并监测pH值,至pH为4.0~5.0时停止滴...
【专利技术属性】
技术研发人员:张乐,顾灵诚,邵岑,周天元,高光珍,王骋,陈浩,
申请(专利权)人:江苏师范大学,
类型:发明
国别省市:江苏,32
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