COHERENT BREMSSTRAHLUNG IN FERRITE OBSERVED BY AN ANALYTICAL TRANSMISSION ELECTRON-MICROSCOPE

Energy dispersive X-ray spectra of ferrite were observed with an analy tical transmission electron microscope (TEM) with the accelerating vol tages 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 acc elerating voltage. It was found that in addition to the shift of CB pe aks to higher energy, the intensities of CB peaks generally tend to be come higher with increasing the accelerating voltage. It was also foun d that the shapes in most CB peaks were asymmetrical and the intensiti es of CB peaks were generally different in each spectrum. The peak ene rgy of CB basically agreed with the calculated values. Furthermore, it was pointed out that since the CB peaks could be confused with the ch aracteristic 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 a xes.