The thermal behaviour of sacrofanite, the ABCABACACABACBACBACABABACABC 28-layer member of the cancrinite−sodalite supergroup has been investigated in situ using laboratory focussing-beam X-ray powder diffraction data. Thermal expansion has been analysed from 303 to 873 K. A moderate anisotropy has been observed at T > 473 K, the c-parameter being softer than the a-parameter. At ca. 800 K the unit cell starts to compress owing to (partial) dehydration. Comparison of the heat-induced properties of cancrinite−sodalite supergroup minerals has shown no clear relationship between crystal chemical and structural features and their thermal behaviour. Only K-rich pitiglianoite shows a significant negative expansion that has been attributed to the occurrence, as in the case of the zeolite erionite, of a sort of “internal cation exchange” process involving the substitution by K of H2O residing at the centre of the cancrinite cage. The same behaviour has been invoked to account for the small cell compression of sacrofanite at T > 773 K.
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Research Article|
May 01, 2018
The thermal behaviour of sacrofanite Available to Purchase
Paolo Ballirano
Dipartimento di Scienze della Terra, Sapienza Università di Roma
, P.le Aldo Moro 5, 00185Roma, Italy
e-mail: [email protected]
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e-mail: [email protected]
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
26 Jun 2017
Revision Received:
05 Aug 2017
Accepted:
14 Aug 2017
First Online:
14 May 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart
European Journal of Mineralogy (2018) 30 (3): 507–514.
Article history
Received:
26 Jun 2017
Revision Received:
05 Aug 2017
Accepted:
14 Aug 2017
First Online:
14 May 2018
Citation
Paolo Ballirano; The thermal behaviour of sacrofanite. European Journal of Mineralogy 2018;; 30 (3): 507–514. doi: https://doi.org/10.1127/ejm/2018/0030-2733
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Index Terms/Descriptors
- alkali metals
- cell dimensions
- compression
- crystal chemistry
- crystal structure
- erionite
- feldspathoids
- framework silicates
- high temperature
- ion exchange
- metals
- physical properties
- potassium
- Rietveld refinement
- silicates
- substitution
- temperature
- thermal expansion
- thermal properties
- unit cell
- volume
- water
- X-ray diffraction data
- zeolite group
- davyne
- afghanite
- liottite
- microsommite
- sacrofanite
- cancrinite-sodalite supergroup
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