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- W2152008110 abstract "Abstract In this study, we examined the annealing effect on the material obtained after acid treatment of ground vermiculite which constituted amorphous silica and β-FeOOH. The XRD patterns of the starting sample measured at temperatures from 30 to 1200 °C showed that the crystalline phase was present until ~ 300 °C; whereas the sample heated between 300 and 800 °C was practically amorphous. This is in agreement with previous observations that β-FeOOH decomposes to amorphous or poorly crystalline phase, β-Fe 2 O 3 , and transforms only slowly to crystalline α-Fe 2 O 3 . At 850 °C the sample showed the first signs of a crystalline phase which was fully developed at 1050 °C. The XRD, HRTEM and Mossbauer spectroscopy showed, after heating at 1050 °C, the presence of crystalline phase, consisting of quartz, cristobalite, α-Fe 2 O 3 and e-Fe 2 O 3 . This effect showed in fact that well crystallized iron oxide nanoparticles embedded into the silica matrix are usually formed at relative high temperatures (~ 1000 °C), which is in contrast to silica-free material. Element mapping of one particle of the composite obtained by annealing the sample at the highest temperature showed well-separated Fe 2 O 3 and SiO 2 particles in a composite material. Impurities of Al and Mg (from the original vermiculite) accompanied the silica components and TiO 2 associated with Fe 2 O 3 grains was also detected." @default.
- W2152008110 created "2016-06-24" @default.
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- W2152008110 date "2011-02-01" @default.
- W2152008110 modified "2023-09-24" @default.
- W2152008110 title "Study of ground and unground leached vermiculite II. Thermal behaviour of ground acid-treated vermiculite" @default.
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- W2152008110 doi "https://doi.org/10.1016/j.clay.2010.11.031" @default.
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