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本文介绍了一种用于合成平均尺寸小于 1μm的超细YBa2 Cu3O7-δ(Y 12 3)粉末的固态反应法 .合成Y 12 3粉末的传统方法是利用BaCO3、Y2 O3和CuO粉末直接固态烧结反应 .本文介绍的方法则利用BaCuO2 ( 0 11)、Y2 O3和CuO粉末之间的固态反应 .本方法不包括传统反应法中限制反应速率的BaCO3分解反应 ,因而与传统固态反应法相比 ,其合成温度及保温时间大大降低 ,从而可以合成超细粉末 .将 0 11、Y2 O3 和CuO粉末按 4∶1∶2的摩尔比混合后在90 0℃于流通氧气中烧结 15小时 ,此时反应刚好完成而生成的Y 12 3粉末又不过分长大 ,得到的粉末平均尺寸小于 1μm .
This paper presents a solid-state reaction method for the synthesis of ultrafine YBa2 Cu3O7-δ (Y12 3) powder with an average size of less than 1 μm.The conventional method of synthesizing Y 12 3 powder is to use direct solid-state sintering of BaCO3, Y2 O3 and CuO powders The method described in this paper makes use of the solid state reaction between BaCuO 2 (0 11), Y 2 O 3 and CuO powders.This method does not include the BaCO3 decomposition reaction which limits the reaction rate in the conventional reaction method, so compared with the traditional solid state reaction method, The synthesis temperature and holding time is greatly reduced, so that ultrafine powder can be synthesized.O 11, Y 2 O 3 and CuO powders are mixed in a 4: 1: 2 molar ratio and sintered in flowing oxygen at 90 ° C. for 15 hours, at this time, the reaction The Y123 powder that was formed just after it was formed was not excessively grown, and the average size of the resulting powder was less than 1 m.