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- W2262824009 abstract "Laihunite is an olivine mineral with ideal composition Fe2+Fer+(Sion)r. Alternate M1 sites are occupied by Fe2* whereas Fe3+ occupies the M2 sites. Small (-1mm) crystals from Laihe, N.E. China exhibit thermally-activated electrical conduction in the range 290-500 K with an activation energy of 0.53 eV. Resistivity at 290 K is 2.2 x 105 Qm. Mdssbauer data show that ferric iron begins to order magnetically below 160+5 K, but that hyperfine splitting for ferrous iron only appears below 100 K. An antiferromagnetic structure ir p.oposed which is consistent both with the crystal structure and with the magnetization curves that indicate antiferromagnetic interactions. Magnetization measurements also show that magnetite inclusions account for less than 0.5 wt.Vo of the sample. Analysis of the 4.2 K Mcissbauer spectrum suggests that there is a distortion of the structure at low temperatures which leads to inequivalent Ml and M2 sites, each with relative populations oi 2'1. In addition, 5+2% of the total iron is identified as Fe2* onM2 sites. This supports evidence from X-ray diffraction which indicated that roughly lO% of the crystal is composed of twin boundary regions with a concentration of divalent ions approaching that of fayalite." @default.
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- W2262824009 date "1985-06-01" @default.
- W2262824009 modified "2023-09-30" @default.
- W2262824009 title "Mössbauer spectra, magnetic and electrical properties of laihunite, a mixed valence iron olivine mineral" @default.
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