期刊
AMERICAN MINERALOGIST
卷 94, 期 8-9, 页码 1262-1270出版社
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2009.3163
关键词
Oregon erionite; erionite-K; crystal structure; iron topochemistry; field emission; scanning electron microscopy; laboratory parallel-beam transmission powder diffraction; Rietveld refinement; Fe-57 Mossbauer spectroscopy
资金
- Aramec Foundation
- Universita di Roma La Sapienza
A complete crystal-chemical characterization of erionite-K from Rome, Oregon, was obtained by combining field emission scanning electron microscopy, laboratory parallel-beam transmission powder diffraction, and Fe-57 Mossbauer spectroscopy. Rietveld refinement results evidenced that the most striking difference in comparison with the structure of erionite-Ca is significant K at a K2 site ((1)/(2), 0, 0), which is empty in erionite-Ca. In addition, site Ca1 shows low occupancy and Ca3 is vacant. The oxidation and coordination state of Fe, whose occurrence was revealed by chemical analysis, have been clarified by exploiting room- and low-temperature Fe-57 Mossbauer spectroscopy. The majority of Fe (95%) was attributed to Fe3+-bearing, superparamagnetic, oxide-like nanoparticles with dimensions between 1 and 9 nm, and the remaining 5% was attributed to hematite particles with size >= 10 nm, both located on the crystal surface.
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