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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F12%3A10128256%21RIV13-GA0-11310___
rdf:type
n5:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1007/s11200-011-9011-y
dcterms:description
Frequency-dependent magnetic susceptibility, its anisotropy (AMS), its temperature variation, natural remanent magnetization and time-dependent isothermal remanent magnetization as well as Mossbauer spectroscopy of a small collection of Celtic and Mediaeval graphitic pottery from Southern Bohemia were investigated. The mineral composition of the pottery is dominated by fragments of quartz, accompanied mainly by various silicates from granitoids and paragneisses, or by calcite, within the plastic component being probably illite but also graphite. No ferrimagnetic minerals were found in optical microscope, among Fe-oxides only limonite was observed, even though the bulk susceptibility of the pottery varies in the orders of 10(-4) to 10(-2) [SI]. This may indicate presence of ferromagnetic particles in the ultrafine (superparamagnetic, SP) state, which is confirmed by frequency-dependent susceptibility ranging from 3% to almost 16%. The low temperature susceptibility vs. temperature curves are only moderately sloped, showing the Verwey transition only in one case. The high temperature curves mostly show presence of two magnetic phases, maghemite and magnetite. Cooling curves show distinctly lower susceptibilities than the heating curves indicating instability of the assemblage of ferrimagnetic minerals, particularly in temperatures slightly under 700 A degrees C. Mossbauer spectroscopy confirmed the results of the frequency-dependent susceptibility, showing the increase of ferrimagnetic sextets in the spectra measured at 4.2K, likely indicating maghemite as the distinct ferrimagnetic phase. The frequency-dependent AMS indicates preferred orientation of SP1,16 particles, coaxiality between SP1,16 grain AMS and whole specimen AMS indicate that all grains, ultrafine and coarser ones, were oriented by the same process, i.e. copying the pottery structure created during wheel-turning. Frequency-dependent magnetic susceptibility, its anisotropy (AMS), its temperature variation, natural remanent magnetization and time-dependent isothermal remanent magnetization as well as Mossbauer spectroscopy of a small collection of Celtic and Mediaeval graphitic pottery from Southern Bohemia were investigated. The mineral composition of the pottery is dominated by fragments of quartz, accompanied mainly by various silicates from granitoids and paragneisses, or by calcite, within the plastic component being probably illite but also graphite. No ferrimagnetic minerals were found in optical microscope, among Fe-oxides only limonite was observed, even though the bulk susceptibility of the pottery varies in the orders of 10(-4) to 10(-2) [SI]. This may indicate presence of ferromagnetic particles in the ultrafine (superparamagnetic, SP) state, which is confirmed by frequency-dependent susceptibility ranging from 3% to almost 16%. The low temperature susceptibility vs. temperature curves are only moderately sloped, showing the Verwey transition only in one case. The high temperature curves mostly show presence of two magnetic phases, maghemite and magnetite. Cooling curves show distinctly lower susceptibilities than the heating curves indicating instability of the assemblage of ferrimagnetic minerals, particularly in temperatures slightly under 700 A degrees C. Mossbauer spectroscopy confirmed the results of the frequency-dependent susceptibility, showing the increase of ferrimagnetic sextets in the spectra measured at 4.2K, likely indicating maghemite as the distinct ferrimagnetic phase. The frequency-dependent AMS indicates preferred orientation of SP1,16 particles, coaxiality between SP1,16 grain AMS and whole specimen AMS indicate that all grains, ultrafine and coarser ones, were oriented by the same process, i.e. copying the pottery structure created during wheel-turning.
dcterms:title
Frequency-dependent susceptibility and other magnetic properties of Celtic and Mediaeval graphitic pottery from Bohemia: an introductory study Frequency-dependent susceptibility and other magnetic properties of Celtic and Mediaeval graphitic pottery from Bohemia: an introductory study
skos:prefLabel
Frequency-dependent susceptibility and other magnetic properties of Celtic and Mediaeval graphitic pottery from Bohemia: an introductory study Frequency-dependent susceptibility and other magnetic properties of Celtic and Mediaeval graphitic pottery from Bohemia: an introductory study
skos:notation
RIV/00216208:11310/12:10128256!RIV13-GA0-11310___
n5:predkladatel
n6:orjk%3A11310
n3:aktivita
n15:P n15:I n15:Z
n3:aktivity
I, P(GAP210/10/0249), Z(MSM0021620855)
n3:cisloPeriodika
3
n3:dodaniDat
n18:2013
n3:domaciTvurceVysledku
n12:5646057 n12:1597779
n3:druhVysledku
n17:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
137250
n3:idVysledku
RIV/00216208:11310/12:10128256
n3:jazykVysledku
n4:eng
n3:klicovaSlova
superparamagnetic particles; Celtic and Mediaeval graphitic pottery; magnetic properties
n3:klicoveSlovo
n7:Celtic%20and%20Mediaeval%20graphitic%20pottery n7:magnetic%20properties n7:superparamagnetic%20particles
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[C8A14F768A8B]
n3:nazevZdroje
Studia Geophysica et Geodaetica
n3:obor
n19:DB
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
6
n3:projekt
n9:GAP210%2F10%2F0249
n3:rokUplatneniVysledku
n18:2012
n3:svazekPeriodika
56
n3:tvurceVysledku
Laufek, František Procházka, Václav Nižňanský, Daniel Petakova, Zdenka Chlupacova, Marta Hrouda, František
n3:wos
000306215200010
n3:zamer
n21:MSM0021620855
s:issn
0039-3169
s:numberOfPages
23
n14:doi
10.1007/s11200-011-9011-y
n22:organizacniJednotka
11310