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- W2290116984 abstract "Ribbe and Lumpkin (1983) have drawn our attention to some errors in our paper Annersten et al. (1982). We have reexamined the sample H 11, having X{f = O.5Z and the new cell parameters of the powder sample used in our Mtissbauer investigations are, a : 4.749(5), b : 10.335(7), c : 6.004(8)A, and v = 294.7(7;A3. the standard deviation in the measured cell parameters of this sample is, however, still large. The correction factors we applied to the observed intensities of the absorption doublets take care of the different Debye temperatures of 57Fe in Ml and M2 sites in olivine (Gibb and Greenwood, l97l); they are small, and the empirical values are obtained from spectra measured at diferent temperatures. It can of course be argued that other errors such as bad resolution, thickness efects, etc. will dominate over the simple assumption of equal recoil free fractions. These corrections are rarely considered in M<issbauer spectroscopy, although the difference in recoil free fraction is enhanced at elevated temperature. It is very interesting to compare the different methods in probing the order-disorder situation in olivines developed by Ribbe and Lumpkin. We have plotted our M<issbauer data (Annersten et al., 1982) in the a-b plot (see Fig. 1) and the agreement with the observed cell parameters is apparently good, since both types of data cluster around the same curve (Kp : 0. l0). However, the Mcissbauer results indicate a higher degree of order than the a and b parameters do. This may indicate that particularly the b-dimensions do not fully account for the order-disorder in olivine. One reason for this may be the non-linear behavior of the b-dimension with increasing octahedral substitution. Present work on the Fe-Mn olivines by Annersten et al. (1984) will support this idea. Finally we apologize for the apparent,mistakes appearX o ,b obserYed fo r l t { i ,F€)S i0 ! o ibssboue. dolo lAnnerslen et ot 19821" @default.
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- W2290116984 date "1984-01-01" @default.
- W2290116984 modified "2023-09-24" @default.
- W2290116984 title "Cation ordering in Ni-Fe olivines: reply" @default.
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