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Study of ground and unground leached vermiculite II. Thermal behaviour of ground acid-treated vermiculite
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SYSNO ASEP 0358368 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Study of ground and unground leached vermiculite II. Thermal behaviour of ground acid-treated vermiculite Tvůrce(i) Perez-Rodriguez, J. L. (ES)
Maqueda, C. (ES)
Murafa, Nataliya (UACH-T) RID, SAI
Šubrt, Jan (UACH-T) SAI, RID
Balek, Vladimír (UACH-T)
Pulišová, Petra (UACH-T) RID, SAI
Lančok, Adriana (UACH-T) ORCID, RID, SAIZdroj.dok. Applied Clay Science. - : Elsevier - ISSN 0169-1317
Roč. 51, č. 3 (2011), s. 274-282Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova vermiculite ; annealing ; amorphous silica Vědní obor RIV CA - Anorganická chemie CEP LC523 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z40320502 - UACH-T (2005-2011) UT WOS 000287893000009 DOI 10.1016/j.clay.2010.11.031 Anotace 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-Fe2O3, and transforms only slowly to crystalline α-Fe2O3. At 850 °C the sample showed the first signs of a crystalline phase which was fully developed at 1050 °C. The XRD, HRTEM and Mössbauer spectroscopy showed, after heating at 1050 °C, the presence of crystalline phase, consisting of quartz, cristobalite, α-Fe2O3 and ε-Fe2O3. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2012
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