871to the experimental conditions for the crystals A, B and C, respectively.The limited instrument resolution, however, implies that the measurements were carried out using a wavelength band rather than a well defined wavelength. From the instrument parameters a 1 = 20' (collimation of the white neutron beam), fl0 = 12' (mosaic spread of the monochromator) and a 2 > (a 2 + 4fl02) 1/2 (collimation between monochromator and sample) the wavelength spread per scan point can be estimated (see, for example, Kalus & Dorner, 1973). The resulting smearing in A is indicated by the full lines above and below the dotted line in Fig. 7 and it is listed in Table 5, expressed as AA/zc. For AA/zr < +½ the average value of R y depends on the exact value ofA 0, the mean A value. HAssuming that A 0 is known only within an uncertainty of + zr/2, we calculated the maximum deviation of R~, y averaged over the AA range, from the mean value Rmean = ze/2. From these deviations, expressed as ARY/RYmean in Table 5, the errors Sos c listed in Table 3 were derived. The Sos c values represent the maximum errors introduced into a by the oscillations of R~. References ALDRED, P. J. E. & HART, M. (1973

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