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Thermal Stability of Barrerite and Na-Exchanged Barrerite: An In Situ Single Crystal X-ray Diffraction Study

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The thermal stability of barrerite (Na8.2K3.0Ca2.2Mg0.2Al17Si55O144 · 50H2O) from Kuiu Island, Alaska, was investigated from 25 °C to 500 °C by In Situ single crystal X-ray diffraction. The same experiments were performed on a Na-exchanged barrerite Na17Al17Si55O144 · 45H2O from the same locality. The results found for the natural sample were in agreement with previous findings, but the high temperature phase modification (phase D) was not observed. In contrast to natural barrerite (space group Amma), Na-exchanged barrerite was found to be monoclinic F2/m at room temperature. Its dehydration trend was characterized by the same structural modifications occurring in natural barrerite in spite of the lower symmetry. The structure of D phase in this sample was determined by ex situ experiments and corresponds to the one reported in literature for natural barrerite.
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Keywords: Barrerite; Na-Exchanged Barrerite; Thermal Stability; X-ray Diffraction

Document Type: Research Article

Affiliations: 1: Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Baltzerstr. 1-3, 3012 Bern, Switzerland 2: Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi 753-8512, Japan

Publication date: 2017-06-01

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