声化学法制备Y2BaCuO5纳米晶及其机理研究

Preparation and Kinetics Mechanism of Y2BaCuO5 Nano-CrystaUites Synthesized by Sonochemical Process

摘要:

以Y2O3，CuCl2和BaCl2等为起始原料，采用声化学方法制备了Y2BaCuOs纳米晶。研究了超声波功率对合成纳米Y2BaCuO5的结晶性能及合成活化能的影响。结果表明：在湿化学过程中施加超声辐射能明显降低合成YzBaCuO5的晶粒尺寸和合成活化能；超声功率从100w增加到300W，合成的纳米Y2BaCu05晶粒尺寸从50nm～60nm减小到20nm～30nm，其合成活化能由87．1kJ／mol降低到53．1kJ／mol。

Abstract:

Nanocrystalline Y2BaCuO5 was prepared by a wet sonochemical process using Y2O3, CuCl2 and BaCl2 as starting material. The influence of ultrasonic power on the crystallization and synthesized activation energy of Y2BaCuO5 were particularly investigated. Results show that the particle size and synthesized activation energy of Y2BaCuO5 decrease with the increase of ultrasonic power. Upon increasing of ultrasonic power from 100 W to 300 W, the particle size and synthesized activation energy of Y2BaCuO5 decrease from 50 nm to 30 nm and from 65 kJ/mol to 47 kJ/mol, respectively.