Raman‐scattering studies of pressure‐induced phase transitions in perovskite‐like acetamidninium manganese formate

We report high‐pressure Raman scattering studies of acetamidninium manganese formate, which show evidence for two pressure‐induced phase transitions between 0.7 and 1.4 GPa and above 5.3 GPa. The first transition is related to distortion of the manganese formate framework whereas the second one affe...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2018-02, Vol.49 (2), p.312-316
Main Authors: Mączka, Mirosław, Silva, Tercio Almeida, Paraguassu, Waldeci
Format: Article
Language:English
Subjects:
Banded structure
Compression
Decompression
formate
Manganese
metal–organic framework
Phase transitions
Pressure
pressure‐dependent Raman studies
Raman spectra
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Summary:We report high‐pressure Raman scattering studies of acetamidninium manganese formate, which show evidence for two pressure‐induced phase transitions between 0.7 and 1.4 GPa and above 5.3 GPa. The first transition is related to distortion of the manganese formate framework whereas the second one affects significantly the structure of the acetamidinium cation. Significant narrowing of the lattice bands suggests that the intermediate and high‐pressure phases are ordered. High‐pressure experiments also indicate different structures of the intermediate phases observed upon compression and decompression. However, release of pressure to ambient value leads to recovery of the initial ambient‐pressure phase. High‐pressure Raman scattering studies of acetamidinium manganese formate show evidence for two pressure‐induced phase transitions between 0.7 and 1.4 GPa and above 5.3 GPa. The first transition is related to distortion of the manganese formate framework whereas the second one affects the structure of the acetamidinium cation.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.5285