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- W2200996951 abstract "Periodico di Mineralogia (2011), 80, 1 (Special Issue), 39-55 - DOI: 10.2451/2011PM0004 Special Issue in memory of Sergio Lucchesi Synthesis and Mossbauer characterization of Fe 1+x Cr 2-x O 4 (0 ≤ x ≤ 2/3) spinel single crystals Marco Quintiliani 1 , Giovanni B. Andreozzi 1,* and Henrik Skogby 2 1 Dipartimento di Scienze della Terra, Sapienza Universita di Roma, Italy 2 Department of Mineralogy, Swedish Museum of Natural History, Stockholm, Sweden *Corresponding author: gianni.andreozzi@uniroma1.it Abstract Spinel single crystals belonging to the FeCr 2 O 4- Fe 3 O 4 join were synthesized by a flux growth method (Na 2 B 4 O 7 as flux, temperature range of 1200-900 °C and cooling rate of 4 °C/h). Crystals with compositions corresponding to Fe 1+x Cr 2-x O 4 (0 ≤ x ≤ 2/3) were obtained and successively investigated by a combined microchemical, diffractometric and spectroscopic approach. Fe-Cr-spinel single crystals produced are of different quality (in terms of size and shape). The flux content in the starting mixture showed to have the most relevant influence on the quality of synthetic products. Electron microprobe analysis evidenced a chemical heterogeneity for crystals of the same batch, with small crystals (down to 50 μm) being more homogeneous than the large ones. Mossbauer spectroscopy was used to determine the actual Fe 3+ /Fe tot ratios and highlighted the absence of magnetic phases. The combined chemical and spectroscopic approach allowed to exclude any deviation from stoichiometry due to oxidation. In contrast with most of the existing literature, Mossbauer spectroscopy indicated the Fe 2.5+ valence state to be present even for iron poor samples with composition close to the end member chromite. Key words : chromite-magnetite solid solution; synthesis, spinel single crystals; Mossbauer spectroscopy." @default.
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- W2200996951 date "2011-04-01" @default.
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- W2200996951 title "Synthesis and Mössbauer characterization of Fe 1+x Cr 2-x O 4 (0 ≤ x ≤ 2/3) spinel single crystals" @default.
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