Gd-Ba-Cu-O超导块材用原始粉Gd_2BaCuO_5(Gd211)粉的制备

The Syntheses of Gd_2BaCuO_5(Gd211) Precursor Powders for Gd-Ba-Cu-O Bulk Superconductor

分别采用3种方法在不同烧结温度下制备Gd211粉末。利用X射线衍射(XRD)、扫描电镜(SEM)、激光粒度分析等手段对3种制备方法进行比较研究。Gd211的成相温度约在900℃以上。随着烧结温度的升高,粉末的碳含量明显降低,但粒子尺寸逐渐增大,且由均匀的球形颗粒变成越来越不规则的大颗粒。3种制备方法相比,草酸盐共沉淀法相对复杂,但合成的材料颗粒较细且均匀,碳含量很低,是最理想的制备Gd211的方法。

Different preparation techniques of Gd211 powders have been studied. The Gd211 powders prepared by three different processes were calcined at different temperatures between 860°C and 960°C. The single phase of Gd211 was formed above 900°C. With calcined temperature increasing, the carbon content of the Gd211 powders reduced, but the Gd211 particle size increased, and the particles being spherical in shape at low calcined temperature became more anomalous. Study of the three preparation processes indicated that the coprecipitation process is complex. But the particles of Gd211 powders prepared by it are fine and homogeneous. The carbon content of the Gd211 powders is small. So the coprecipitation process is the best preparation process of Gd211 powders in the three preparation process.