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Changes of atomic structure on annealing Fe90 Zr7 B3 Because of very good soft magnetic properties, much attention has been paid to amorphous Fe-Zr-B alloys which form an -Fe nanocrystalline structure on primary crystallization [23]. Atomic structure changes on annealing have been studied [12] in order to investigate the role of the amorphous matrix in constraining the growth of -Fe particles in the crystallization stage [24]. Specimens were annealed at 693, 733 and 923 K for 1 h, followed by electron diffraction intensity measurements, pair distribution function analysis and reverse Monte Carlo simulation to determine changes in local atomic arrangements on annealing.

Diffraction rings from randomly oriented bcc -Fe nanoparticles are seen. (c) and (d) are Fourier-transformed patterns from areas I and J, respectively. The patterns in (c) and (d) correspond to those of Fe3 Zr [210] and Fe2 Ze [111] lattice images, respectively. liquid region [13] by electron microscopy and diffraction, using a specimen heating stage, an image plate to record diffraction intensities and highresolution images, and an in-column type energy filter. 02 K/s. 15 shows a series of reduced interference functions FðQÞ obtained from in-situ electron diffraction during annealing in a transmission electron microscope.

It is important to note that, for precise electron diffraction pair distribution function analysis, the most important procedure is to obtain diffraction intensity profiles under conditions as close as possible to kinematical diffraction, with insignificant inelastic scattering or multiple scattering, and with good linearity in the intensity recording. For kinematical conditions, the background intensity BGðQÞ lies almost along the h f 2 i curve. The following procedure is used to obtain the experimental pair distribution function.

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