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  • 1 University of Hamburg Martin Institute of Inorganic and Applied Chemistry Luther-King-Platz 6 2000 Germany
  • | 2 Mettler-Toledo AG, Im langacher CH-8606 Greifensee Switzerland
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The thermal reactivity of the naturally occurring silicates jadeite, NaAl[Si2O6], and nephrite, a variety of actinolite, Ca2 (Mg,Fe)5[(OH,F)Si4O11]2, have been investigated by thermogravimetric and thermomechanical analysis as well as temperature-dependent X-ray diffraction and analytical electron microscopy. TG shows that nephrite undergoes a weight loss at around 900°C. Mass spectrometry reveals that this irreversible reaction corresponds to the evolution of H2O, and XRD shows that a phase related to diopside CaMg[Si2O6] is formed. Jadeite does not undergo and observable weight changes up to 1000°C. Thermomechanical analysis indicates a reversible phase transition at about 950°C. Temperature-dependent X-ray diffraction shows that jadeite is again present on cooling (peak temperature: 1000°C), but that this is accompared by an additional unidentified phase. The mechanism of this process is not yet clear although it has been observed in several samples from different origins and with different metal impurities.

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  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
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  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
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Founder Akadémiai Kiadó
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)