Móssbauer spectra at 77°K have identified the precipitated gel formed by the interaction of TiCI3 and H3Fe(CN)6 solutions as a ferrocyanide, Ti4+[Fe(CN)6]4-, resulting from a redox reaction. The isomer shift (5 = -0.06 mm/sec) and quadrupole splitting ( 0) are identical (based on a computer curve-fit program) with those from a sample of Ti4+[Fe(CN)s]4-made by the direct interaction of TiCl, and H4Fe(CN)6 solutions. The precipitated gel formed from TiCl3 and [H4Fe(CN)6] gave = -0.01 and = 0, and corresponds to Ti3+4[Fe(CN)6]4-3, which is expected in the absence of a redox reaction. Móssbauer spectra for Fe2+3[Co(CN)6]3-2 exhibited double quadrupole splitting. The peak for = 2.81 is attributed to four Fei2+ ions in the 4b positions of Fm3m, whereas the peak for = 1.82 is attributed to two Fen2+ ions statistically distributed in the 8c positions. For the first time it has been shown that the two kinds of Fe2+ ions are actually in a different environment. Móssbauer spectra of the so-called Prussian and Turnbull's blue, which have been aged under water for 10 min or more and selectively enriched in 57Fe to obviate severely overlapping Móssbauer absorption peaks, have confirmed the work of earlier investigators on unenriched samples. Both of the blue gels which have contacted water for less than 30 min after the precipitation step have been found to be amorphous by electron diffraction, whereas longer aged samples are crystalline. It is suggested that Móssbauer spectra for such gels aged for periods much less than 10 min would throw light on this rapid aging phenomenon.
Snyder et al. [1963] have shown, on the basis of Mariner 2 data, that a positive relationship exists between solar wind velocity V, and the daily sum of the geomagnetic index :ZK•. A physical theory has been proposed by Dessler and Walters [1964] that predicts a power-law relationship between V, and the geomagnetic A• (or ap) index. Therefore, to compare the data with the above theory, we have replotted the data of Snyder et al. [1963] in the form V,
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