Neutron Scattering

Quartz HK407
ô
m
6
Fig .
20 . . . . . . . . . . . 0. . . . . . . . . . 0 . . . . . . . . . . 0
. . . . . . . . .
2 theta
18 .25 : Experimental neutron diffraction pattern (points)of a quartzite specimen as mean
diagram ofabout 500 différent sample orientations during polefigure scanning andfullpattern
profilefit (solid line)for separation ofoverlapping peaks (dotted curves) . The
indexing is acoording to the hexagonal quartz structure.
The pole figure data processing, which is adapted to the special potential of the positionsensitive
detector and the automatic recording of complete diffraction patterns for each
sample orientation, is performed stepwise in a semi-automatic way by (1) adding up all
diagrams and preparing a mean diagram of all sample orientations, (2) profile fitting the sum
diagram (Fig . 18 .25) in order to separate overlapping reflections and to determine orientationindependent
reflection parameters, i .e . pealç positions and halfwidths, (3) profile fitting the
individual diagrams for the determination of the integrated pealç intensities, i .e . the orientation
Fig . 18.26 : Experimental pole figures of a naturally deformed quartzite . A total of 14 pole
figures is obtained simultaneously from a single pole figure scan at the texture diffractometer
SV7-b at the FRJ-2 reactor in Jülich. The instrument is equipped with a large linear detector.
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