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Peer-reviewed Lead author Corresponding author
Dec, 2020

CO2 distribution in CO2-rich melanophlogite from Fortunillo, Tuscany, Italy

JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES
  • Masami Kanzaki

Volume
115
Number
6
First page
471
Last page
478
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.2465/jmps.200611
Publisher
JAPAN ASSOC MINERALOGICAL SCIENCES

CO2 distribution in M-12 and M-14 cages of CO2-rich melanophlogite from Fortunillo, Tuscany, Italy was studied using synchrotron powder X-ray diffraction. Original and two heat-treated samples at 500 and 1000 degrees C were studied at room temperature. The diffraction patterns of these samples can be indexed as a cubic cell (Pm (3) over barn). For the non-heated sample, CO2 occupancy for M-14 cage is close to unity, whereas about 0.85 for M-12 cage. For the 500 degrees C heated sample, the occupancies for M-14 and M-12 cages are reduced to 0.79 and 0.57, respectively. Present study showed that CO2 has preference to M-14 cage, but substantial CO2 occupies M-12 cage. The electron distributions obtained by MEM analysis clearly reveal orientationally ordered CO2 distribution in M-12 and M-14 cages. Present result is also used to clarify a recently proposed interpretation for the splitting of CO2 Raman vibrational peak for the heat-treated melanophlogite.

Link information
DOI
https://doi.org/10.2465/jmps.200611
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000603516400004&DestApp=WOS_CPL
ID information
  • DOI : 10.2465/jmps.200611
  • ISSN : 1345-6296
  • eISSN : 1349-3825
  • Web of Science ID : WOS:000603516400004

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