Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 99: Issue 2
A low-temperature heat capacity study of natural lithium micas
Heat capacity of zinnwaldite
Authors:
I. Paukov Institute of Inorganic Chemistry SB RAS pr. Ac. Lavrentieva 3 630090 Novosibirsk Russia

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Yulia Kovalevskaya Institute of Inorganic Chemistry SB RAS pr. Ac. Lavrentieva 3 630090 Novosibirsk Russia

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Irina Kiseleva M.V. Lomonosov Moscow State University, Leninskie Gory Geological Department 119991 Moscow Russia

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Tatiana Shuriga All-Russian Institute of Mineral Resources 31, Staromonetny per 119017 Moscow Russia

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Pages:
709–712
Online Publication Date:
28 Aug 2009
Publication Date:
01 Feb 2010
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-009-0210-5
Keywords:
Micas; Adiabatic calorimetry; Heat capacity; Entropy; Enthalpy
Restricted access

Abstract

Low-temperature heat capacity of natural zinnwaldite was measured at temperatures from 6 to 303 K in a vacuum adiabatic calorimeter. An anomalous behavior of heat capacity function Cp(T) has been revealed at very low temperatures, where this function does not tend to zero. Thermodynamic functions of zinnwaldite have been calculated from the experimental data. At 298.15 K, heat capacity Cp(T) = 339.8 J K−1mol−1, calorimetric entropy So(&) – So(6.08) = 329.1 J K−1 mol−1, and enthalpy &o(&) − &o(6.08) = 54,000 J mol−1. Heat capacity and thermodynamic functions at 298.15 K for zinnwaldite having theoretical composition were estimated using additive method of calculation.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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