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经不同温度退火处理的纳米纤锌矿氮化硼的结构变化及长大规律

CHANGE OF NANO-wBN IN STRUCTURE AND PARTICLE SIZE WITH TEMPERATURE

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【Author】 JU XIN SU YI-XI CHI YUAN-BIN WEI KUN SHI CHAD-SHU1) (Department of Modern Physics, University of Sicence and Technolgy of China, Hefei 230026)2) (Department of Physics, University of Sicence and Technolgy of China, Hefei 230026)3) (Superhard Material National Laboratory, Jilin University, Changchun 130023)(Received 8 September 1993; revised manuscript received 5 April 1993)

【机构】中国科学技术大学近代物理系；中国科学技术大学物理系；吉林大学超硬材料国家实验室合肥230026；合肥230026；长春130023；

【摘要】用冲击波法合成了纤锌矿氮化硼(wBN)超微粉,粉末X射线衍射(PXRD)和透射电子显微镜(TEM)的研究指出:所合成的wBN是由尺寸为10—100nm的薄片状微晶构成,其平均尺寸约为16nm,同时发现随着样品退火温度的增加,颗粒尺寸缓慢长大.从500℃开始有较快的增长,晶形趋于完整,无结构上的变化.更多还原

【Abstract】 In this paper, we investigate the changes of wBN ultrafine particles prepared by shock-wave method in structure and particle size with temperature by PXRD and TEM experiments. It is found that all wBN samples are of wurtzite structure, and the average particle size of the unheat-treated sample is about 16nm. The changes of structure of wBN heat-treated at 100,300,500,600 and 800℃ have not been observed, and the average particle size of wBN heat-treated below 500℃ is about 20nm, and that above this temperature exceeds 30nm.更多还原

【关键词】氮化硼；纤锌矿；退火温度；平均尺寸；无结构；透射电子显微镜；晶形；颗粒尺寸；烧结活性；薄片状；

【基金】国家自然科学基金

【文献出处】物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,1995年09期

【分类号】TQ174
【下载频次】86

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