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RMS Annual Session combined with the Fedorov Session 2012
Saint Petersburg, Russia
8-10 October 2012
2012minsoc.ru
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Ir-spectroscopic, x-ray and thermochemical study of dioctahedral smectites of different composition

RMS-DPI code:  2012-1-132-0
Scientific session:  M4. Progress in analytical techniques in mineral, ore and rocks investigation
Author listing:  Kiseleva I.A., Ogorodova L.P., Vigasina M.F., Melchakova L.V., Krupskaya V.V.
Principal author:  Kiseleva Irina A.
Language:  Russian
Abstract - Summary 
(short description):
Physico-chemical study of dioctahedral smectites from deposits of various origins carried out by X-ray fluorescent, X-ray diffraction, infrared spectroscopy, thermogravimetric and thermochemical methods. Na-montmorillonites, Ca-montmorillonites, Zn-containing montmorillonite, nontronites, and volkonskoite were identified as a result of complex study of the composition and structure of smectites. Thermochemical study of the processes of dehydration of the studied smectites found that the enthalpy of the removal of adsorbed and interlayer water ranges from 6 to 16 kJ per mole of H2O, the dehydroxylation of
montmorillonites (removal of constitutional water OH-groups) is significantly more energy-capacious process (166 10 kJ per1 mole of H2O). By high-temperature melt solution calorimetry the standard enthalpies of formation for hydrous and dehydrated hydroxyl-containing smectites were determined. From experimental data obtained for natural samples the enthalpies of formation of the smectite end members with theoretical composition were estimated.

 
Date of presentation:  09/10/2012
Presentation Place:  Mining University, foyer of the Assembly Hall
 
RMS-DPI code:  2012-1-132-0
Proceeedings volume 
in the RMS catalogue:
 
Mineralogy in whole space of the word.
File of proceedings 
(PDF): 
 244 K
Status:  printed
Accepted:  28/08/2012
Published on-line:  05/11/2012
Permanent address of publication:  http://www.minsoc.ru/2012-1-132-0/
Contact author(s):  Kiseleva, Irina A.
 

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