Abstract
We report for the first time phonon properties of
CH3CH2NH3Mg(HCOO)(3) (EtAMg). The studied compound undergoes two
structural temperature-induced phase transitions and
temperature-dependent Raman and infrared studies let us to obtain
insight into mechanism of these transitions. In particular, very large
broadening of infrared and Raman bands, attributed to vibrations of the
NH3 groups, revealed highly dynamic nature of these groups in the both
high-temperature phases. This result indicates that the phase
transitions at 374 and 426K are associated with disordering of the
template cations. Raman and infrared data also show that both phase
transitions are accompanied by significant distortion of the anionic
framework. We also present the pressure-dependent Raman data of EtAMn
framework up to 7.1GPa. These data revealed presence of two
pressure-induced phase transitions, one between 3.7 and 4.0GPa and
second between 5.6 and 6.0GPa. We discuss mechanisms of these
transitions. Copyright (c) 2017 John Wiley & Sons, Ltd.
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