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�������պ����ѧѧ�� 2004, Vol. 30 Issue (09) :822-825    DOI:
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Electromagnetic characteristics of different shape ZnO composite
Liu Jianhua, Sun Jie, Li Songmei, Chen Dongmei*
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ����̼��ԭ�����Ʒ��Ʊ���������ϵ��п��ṹ�Ľ�״����п����,ʹ��Ӳ֬���ܽ�-����(sol-gel)ȼ�շ��Ʊ�����������п���׾���.ʹ�ò����������õ��IJ����Լ���������п���Ͻ����˴ŵ��ʺͽ�糣���IJ���.�������,��8~12?GHz�IJ��Է�Χ��,�Ľ�״����п���롢����п���׾����Լ���������п�Ľ�������Ƶ�ʵ����ӱ仯������.΢����������������,�Ľ�״����п�����Լ�����п���׾�����һ�ֽ����IJ���,����һ����΢����������,�����Ľ�״����п����Ľ����Ĵ�������п���׾���.��������п���������Ƶ�ʷ�Χ�ڻ���û�е�����.
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Abstract�� Tetrapod-shaped ZnO whiskers (T-ZnO) with the structure of hexagonal cross sections were prepared by using the control method of carbon-reducing agent. The spherical-shaped ZnO nanocrystals were synthesized by using stearic acidsol-gel combustion technique. The dielectric constants and magnetic constants of the products were studied by using the waveguide method of electromagnetic characteristics. It was shown that the increments of both dielectric loss and magnetic loss of tetrapod-shaped ZnO (T-ZnO) whiskers and the ZnO nanocrystals were not obvious with the frequency in the range of 8~12?GHz. It was demonstrated that the tetrapod-shaped ZnO (T-ZnO) whiskers and the ZnO nanocrystals were the materials with the performance of dielectric dissipation by the experiment of microwave electromagnetic characteristics, and the dielectric dissipation of T-ZnO was higher than that of nanosized ZnO. It was not found that the bulk materials of ZnO had the electromagnetic dissipation performance in the range of frequency 8~12?GHz.
Keywords�� zinc oxide   microwave absorbing materials   nanocrystals   tetrapod-shaped whiskers     
Received 2003-06-17;
Fund:

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About author: ������(1957-),��,���ϳ�����,����, liujh@buaa.edu.cn.
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������, ���, ����÷, �¶�÷.��ͬ��ò����п��΢����������о�[J]  �������պ����ѧѧ��, 2004,V30(09): 822-825
Liu Jianhua, Sun Jie, Li Songmei, Chen Dongmei.Electromagnetic characteristics of different shape ZnO composite[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(09): 822-825
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