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- W2165883071 abstract "Several apparent errors and one major inconsistency have been discovered in our examination of the relationships among the unit cell dimensions, bulk compositions and octahedral site occupancies of the Ni-Fe olivines synthesized and studied by Annersten et al. (1982). The first but probably least important ofthese discrepancies involves nonconformity among bulk compositions (XTf), ttre Ml and M2 site occupancies (Xff) calculated from fitted, high-temperature M<irssbauer spectra, and the areas themselves. The spectra were corrected for difrerent recoil-free fractions of iron in the Ml and M2 sites, and although it is not clear to the nonspecialist how (or why) these corrections were applied, they may account for some but not all of the discrepancies reported in Table 3 of Annersten et al. For their sample Hl4, reported values Xfi1 : 0.87 and Xfr? : 0.99 add up to X5i : 0.93 (not 0.91, as given), but ifthe areas ofthe deconvoluted Mdssbauer spectra from Fe in Ml and M2 are assumed to be correct and are used unmodified to recalculate Xfi1 and Xft2, the new values are 0.83 and 0.99. A similar conflict arises with sample 15: (Xfii + X#)12: 0.865, in slight disagreement with the given value of Xff = O.SS. Recalculated from bulk composition and the areas, Xfie, : 0.79 and X{f, = 1.00, not 0.77 and 0.96, as given. In sample 16 ffi and Xff are consistent, but the areas yield somewhat different values for Xfii and Xfti than those reported (0.67 and 0.99 rather than 0.69 and 0.96). By contrast, the data for Hll ale apparently free from inconsistencies. There is an error of a different sort in the reported values of XTi and Xfti for sample Hlz. lt the bulk composition of 0.25 is correct, then the chemical formula is Ni1 5Fee5SiOa. The Mcissbauer spectrum of Hl2 (their Fig. 3) is interpreted to indicate that all the iron is in the M2 site, and thus Xft2 : 0.5, not 0.25 as reported and plotted in their Figure 4. Revised (new) Xfri and Xft2 values are collected in Table I, to-" @default.
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- W2165883071 date "1984-01-01" @default.
- W2165883071 modified "2023-09-26" @default.
- W2165883071 title "Cation ordering in Ni-Fe olivines: corrections and discussion" @default.
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