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Journal of Electron Microscopy 47(4): 345-350 (1998)
© 1998 Oxford University Press

Coherent bremsstrahlung in ferrite observed by an analytical transmission electron microscope

Takafumi Satoh1,*, Etsuo Otsuki1 and Daisuke Shindo2

1Tokin Corporation Koriyama 6-7-1, Taihaku-ku, Sendai 982–8510
2Institute for Advanced Materials Processing, Tohoku University Katahira 2-1-1, Aoba-ku, Sendai 980¯8577, Japan

*To whom correspondence should be addressed. E-mail: 79001{at}tokin.co.jp

Energy dispersive X-ray spectra of ferrite were observed with an analytical transmission electron microscope (TEM) with the accelerating voltages from 100 to 300 kV, and coherent bremsstrahlung (CB) peaks have been investigated in detail. The energy and intensity of the CB peaks have been measured by changing the incident beam direction and the accelerating voltage. It was found that in addition to the shift of CB peaks to higher energy, the intensities of CB peaks generally tend to become higher with increasing the accelerating voltage. It was also found that the shapes in most CB peaks were asymmetrical and the intensities of CB peaks were generally different in each spectrum. The peak energy of CB basically agreed with the calculated values. Furthermore, it was pointed out that since the CB peaks could be confused with the characteristic X-ray peaks of small amounts of added elements such as Si and Ca in ferrite, it was necessary to analyse away from major zone axes.

Keywords     coherent bremsstrahlung, analytical TEM, ferrite

Received     16 December 1997, accepted 16 April 1998


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