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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F13%3A43895568%21RIV14-MSM-22310___
rdf:type
skos:Concept n11:Vysledek
dcterms:description
The effect of hydrothermal conditions on process of kaolinite rehydroxylation at 180 °C and 230 °C and for soaking times from 1 to 200 hour was studied by thermal analysis (DTA, DSC, TG). It is shown that the kaolinite dehydroxylation of rehydroxylated samples shifts to lower temperatures compared to the original kaolinite. Amounts of kaolinite in rehydroxylated samples were calculated from TG curves. The curve of the kaolinite mass gain plotted against the time of hydrothermal treatment indicates a two stage process with a different mass gain rate representing short and long-time measurements. Multiple dehydroxylation was studied by repeated calcinations (2 h at 600 °C) and hydrothermal treatments (10 h at 230 °C). It was proved that values of activation energy (Ea) of multiple dehydroxylations decreased with the increasing number of repeated treatments. Conclusions of the study were applied for the investigation of kaolinite origin in archaeological samples from Roztoky near Prague. The effect of hydrothermal conditions on process of kaolinite rehydroxylation at 180 °C and 230 °C and for soaking times from 1 to 200 hour was studied by thermal analysis (DTA, DSC, TG). It is shown that the kaolinite dehydroxylation of rehydroxylated samples shifts to lower temperatures compared to the original kaolinite. Amounts of kaolinite in rehydroxylated samples were calculated from TG curves. The curve of the kaolinite mass gain plotted against the time of hydrothermal treatment indicates a two stage process with a different mass gain rate representing short and long-time measurements. Multiple dehydroxylation was studied by repeated calcinations (2 h at 600 °C) and hydrothermal treatments (10 h at 230 °C). It was proved that values of activation energy (Ea) of multiple dehydroxylations decreased with the increasing number of repeated treatments. Conclusions of the study were applied for the investigation of kaolinite origin in archaeological samples from Roztoky near Prague.
dcterms:title
Hydrothermal rehydroxylation of kaolinite studied by thermal analysis Hydrothermal rehydroxylation of kaolinite studied by thermal analysis
skos:prefLabel
Hydrothermal rehydroxylation of kaolinite studied by thermal analysis Hydrothermal rehydroxylation of kaolinite studied by thermal analysis
skos:notation
RIV/60461373:22310/13:43895568!RIV14-MSM-22310___
n11:predkladatel
n12:orjk%3A22310
n3:aktivita
n18:S
n3:aktivity
S
n3:cisloPeriodika
4
n3:dodaniDat
n14:2014
n3:domaciTvurceVysledku
n13:1707647 n13:8742499 n13:6667864
n3:druhVysledku
n16:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
78509
n3:idVysledku
RIV/60461373:22310/13:43895568
n3:jazykVysledku
n5:eng
n3:klicovaSlova
Archaeological ceramics; Rehydroxylation; Dehydroxylation; Thermal analysis; Kaolinite
n3:klicoveSlovo
n4:Rehydroxylation n4:Kaolinite n4:Dehydroxylation n4:Archaeological%20ceramics n4:Thermal%20analysis
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[77D6936D89BA]
n3:nazevZdroje
Ceramics-Silikáty
n3:obor
n6:AC
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n14:2013
n3:svazekPeriodika
57
n3:tvurceVysledku
Zemenová, Petra Kohoutková, Martina Kloužková, Alexandra Kloužek, Jaroslav
s:issn
0862-5468
s:numberOfPages
6
n17:organizacniJednotka
22310