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  On the nature of the phase transitions of aluminosilicate perrhenate sodalite

Petersen, H., Robben, L., & Gesing, T. M. (2020). On the nature of the phase transitions of aluminosilicate perrhenate sodalite. Zeitschrift für Kristallographie-Crystalline Materials, 235(6-7), 213-223. doi:10.1515/zkri-2020-0027.

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 Creators:
Petersen, Hilke1, 2, 3, Author              
Robben, Lars1, 2, Author
Gesing, Thorsten M.1, 2, Author
Affiliations:
1University of Bremen, Institute of Inorganic Chemistry and Crystallography, Leobener Str. 7, 28359 Bremen, Germany, ou_persistent22              
2University of Bremen, MAPEX Center for Materials and Processes, Bibliotheksstr. 1, 28359 Bremen, Germany, ou_persistent22              
3Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              

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Free keywords: high-temperature in-situ X-ray diffraction; low-temperature in-situ X-ray diffraction; perrhenate sodalite; phase transitions
 Abstract: The temperature-dependent structure-property relationships of the aluminosilicate perrhenate sodalite |Na8(ReO4)2|[AlSiO4]6 (ReO4-SOD) were analysed via powder X-ray diffraction (PXRD), Raman spectroscopy and heat capacity measurements. ReO4-SOD shows two phase transitions in the investigated temperature range (13 K < T < 1480 K). The first one at 218.6(1) K is correlated to the transition of dynamically ordered P4̅ 3n (> 218.6(1 K) to a statically disordered (<218.6(1) K) SOD template in P4̅ 3n. The loss of the dynamics of the template anion during cooling causes an increase of disorder, indicated by an unusual intensity decrease of the 011-reflection and an increase of the Re-O2 bond length with decreasing temperature. Additionally, Raman spectroscopy shows a distortion of the ReO4 anion. Upon heating the thermal expansion of the sodalite cage originated in the tilt-mechanism causes the second phase transition at 442(1) K resulting in a symmetry-increase from P4̅ 3n to Pm3̄͞ n, the structure with the sodalites full framework expansion. Noteworthy is the high decomposition temperature of 1320(10) K.

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Language(s): eng - English
 Dates: 2020-05-032020-05-202020-07-012020-07-28
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1515/zkri-2020-0027
 Degree: -

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Title: Zeitschrift für Kristallographie-Crystalline Materials
  Abbreviation : Z. Kristallogr. - Cryst. Mater.
Source Genre: Journal
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Publ. Info: Berlin/Boston : de Gruyter
Pages: - Volume / Issue: 235 (6-7) Sequence Number: - Start / End Page: 213 - 223 Identifier: ISSN: 2194-4946
CoNE: https://pure.mpg.de/cone/journals/resource/2194-4946