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- W2100140749 abstract "Resonant absorption spectra (Mdssbauer effect) of 5?Fe in two synthetic orthopyroxenes with compositions Fe'ztl(Fe'?* * Mg) : x: 0.80 (opx6) and x : 0'51 (opx4) were studied at temperatures between 7 and 293 K. Opx6 showed a transition to a magrretic phase, the N6el point being ?* : 28 K. Opx4 did not reveal a 2. Instead, gradually increasing magnetic line broadening occurred below Z : 12 K because of paramagrretic relaxation. The temperature dependencies of the nuclear quadrupole splittings, AEo, of Fe'* at both Ml and M2 sites were determined. They are interpreted in terms of crystal field theory using the strong field scheme. Spin-orbit coupling and fourth-order terms were included in the calculation. For Fe2* at M2, a pseudosymmetry of mm2 was assumed. Using the covalency factor a2, ze2r21, and ze2ra) as adjustable parameters to fit the LEodata, a frequency of 817 cm-r was obtained for the 'A,-'A, transition. The calculation predicts a positive sign for the A,Eo, in agreement with the sign experimentally determined by Wiedenmann et al. (1986). For Fe2* at Ml, an effective axial crystal field was assumed. By adopting the experimentally known positive sign of V= in the AEo for M I , a pseudotetragonal distortion can be predicted. The ground-state sptitting A was used as an adjustable parameter, yielding A : 480 cm I. The fitted covalency factor was d2 : 0.72 for Ml as well as M2. The isomer shifts of Fe,*(Ml) and Fe'?*(M2) at 0 K were determined using the Debye approximation. The estimated Debye temperatures, do, for Ml and M2 are 325 + 25 K and 225 ! 25 K, respectively." @default.
- W2100140749 created "2016-06-24" @default.
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- W2100140749 date "1993-01-01" @default.
- W2100140749 modified "2023-09-27" @default.
- W2100140749 title "Local electronic states of Fe2+ ions in orthopyroxene" @default.
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