Growth of centimeter-sized [(CH₃)₂NH₂][Mn(HCOO)₃] hybrid formate perovskite single crystals and Raman evidence of pressure-induced phase transitions

Abstract

The fewer the number of the nucleation sites formed in the vessel, the larger the size of the obtained crystals.

Vibrational investigation of pressure‐ and temperature‐induced phase transitions in metal formates templated by ethylammonium ions

“…It was shown that all of phase transitions are associated with the deformation of manganese‐formate frameworks, whereas the DMA + cations are not largely influenced . The transition at 6.7 GPa is also connected with large structural changes in the HBs system . Our results obtained for EtAMn also reveal deformation of the anionic formate framework under applied high pressure.…”

“…Recent high‐pressure Raman studies of [(CH 3 ) 2 NH 2 ][Mn(HCOO) 3 ] (DMMn) revealed the existence of three high‐pressure polymorphs at 2.1, 4.1 and 6.7 GPa. It was shown that all of phase transitions are associated with the deformation of manganese‐formate frameworks, whereas the DMA + cations are not largely influenced . The transition at 6.7 GPa is also connected with large structural changes in the HBs system .…”

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

“…The known formates have been extensively studied in a broad temperature range, and these studies showed that majority of them undergo phase transitions associated with orientational ordering of organic cations located in the cavities of the framework . Pressure is another thermodynamic parameter that can help to better understand structure–property relationship in this class of compounds . For instance, it has been shown that application of pressure may lead to enhancement of ferroelectric properties or its suppression .…”

“…For instance, it has been shown that application of pressure may lead to enhancement of ferroelectric properties or its suppression . Furthermore, application of pressure may lead to discovery of novel polymorphs that are not thermodynamically stable at ambient conditions . We have decided, therefore, to study high‐pressure behaviour of recently discovered acetamidinium manganese formate ([CH 3 C(NH 2 ) 2 ][Mn(HCOO) 3 ], AceMn), using Raman spectroscopy because this method is well‐known to be a very valuable tool in high‐pressure studies due to its sensitivity to changes in dynamics and structure of molecular units …”

Magnetic field-temperature phase diagram of multiferroic [(CH3)2NH2]Mn(HCOO)3<

“…18,22 Other perovskite-like materials including the rare earth manganites also sport exotic phase diagrams, 23 providing additional motivation for measurements of [(CH 3 ) 2 NH 2 ]Mn(HCOO) 3 under external stimuli. 24 In order to explore the spin behavior of a model metalorganic multiferroic, we measured the magnetization of [(CH 3 ) 2 NH 2 ]Mn(HCOO) 3 in pulsed fields up to 65 T and temperatures down to 0.37 K. The magnetic fieldtemperature (B-T ) phase diagram developed from these data reveals a spin flop at 0.31 T and a transition to 25,26 although in this system, we have not only an adaptable framework but also a mechanism for multiferroic behavior. In contrast to the antiferromagnetic rare earth manganites, the energy scales are smaller which makes the high field phase accessible with laboratory-based magnets.…”