NDLI: Thermal stability of the ‘cave’ mineral ardealite Ca$_{2}$(HPO$_{4}$)(SO$_{4}$)·4H$

Content Provider	Springer Nature Link
Author	Frost, Ray L. Palmer, Sara J. Pogson, Ross
Copyright Year	2011
Abstract	Thermogravimetry combined with evolved gas mass spectrometry has been used to characterise the mineral ardealite and to ascertain the thermal stability of this ‘cave’ mineral. The mineral ardealite Ca$_{2}$(HPO$_{4}$)(SO$_{4}$)·4H$_{2}$O is formed through the reaction of calcite with bat guano. The mineral shows disorder, and the composition varies depending on the origin of the mineral. Thermal analysis shows that the mineral starts to decompose over the temperature range of 100–150 °C with some loss of water. The critical temperature for water loss is around 215 °C, and above this temperature, the mineral structure is altered. It is concluded that the mineral starts to decompose at 125 °C, with all waters of hydration being lost after 226 °C. Some loss of sulphate occurs over a broad temperature range centred upon 565 °C. The final decomposition temperature is 823 °C with loss of the sulphate and phosphate anions.
Starting Page	549
Ending Page	553
Page Count	5
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	107
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-03-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Raman spectroscopy Phosphate Sulphate Ardealite Measurement Science and Instrumentation Polymer Sciences Inorganic Chemistry Physical Chemistry Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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