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Study of ground and unground leached vermiculite II. Thermal behaviour of ground acid-treated vermiculite

SYSNO ASEP	0358368
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Study of ground and unground leached vermiculite II. Thermal behaviour of ground acid-treated vermiculite
Author(s)	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, SAI}
Source Title	Applied Clay Science. - : Elsevier - ISSN 0169-1317 Roč. 51, č. 3 (2011), s. 274-282
Number of pages	9 s.
Language	eng - English
Country	NL - Netherlands
Keywords	vermiculite ; annealing ; amorphous silica
Subject RIV	CA - Inorganic Chemistry
R&D Projects	LC523 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z40320502 - UACH-T (2005-2011)
UT WOS	000287893000009
DOI	10.1016/j.clay.2010.11.031
Annotation	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.
Workplace	Institute of Inorganic Chemistry
Contact	Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
Year of Publishing	2012

Number of the records: 1