Structure and ferroelectric properties of(C3N2H5)5Bi

Phase Transition Originating from Order–Disorder Transformations of Carboxy Oxygen Atoms Coupled with Dynamic Proton Motions in [PhCH2NH(CH3)2]2C2O4⋅H2C2O4

“…Figure 7 also show no obvious dielectric relaxation process near the phase-transition temperature at different frequencies, illustrating that the motion of the dipolar is very fast during the phase transition. [17] In summary, we have presented a new phase-transition material [PhCH 2 NHA C H T U N G T R E N N U N G (CH 3 ) 2 ] 2 C 2 O 4 ·H 2 C 2 O 4 , which undergoes a reversible first-order phase transition at 151.6 K confirmed by the combined DSC, specific heat capacity, and dielectric measurements and variable-temperature single-crystal structural analyses. A bulk optical-quality crystal of 1 as the potential phase-transition material has also been grown with a size of 17.3 12.5 2.1 mm 3 using the controlled temperature cooling solution growth technique.…”

Thermodynamic properties and molecular motions in ferroelectric (C3N2H5)5Sb2Br11

“…The later type of crystals is characterized by a discrete bioctahedral unit (0D). For the compounds characterized by the R 5 M 2 X 11 composition the ferroelectricity was found both in the case of small in size cations (methylammonium) and pyridinium and imidazolium as well [12][13][14].…”

Structural characterization, thermal, dielectric and vibrational properties of tris(allylammonium) hexabromoantimonate(III), (C3H5NH3)3SbBr6

“…It is known, however, that in the case of 2D ferroelectrics, characterized by the R 3 M 2 X 9 composition, their cations, such as monomethyl-, dimethyl-or trimethylammonium [12][13][14], are rather small. On the other hand, in the R 5 M 2 X 11 compounds the polar properties are found in either the small alkylammonium cations (methylammonium) or the aromatic ones (pyridinium and imidazolium) [15][16][17][18]. The ferroelectricity of these subgroups of crystals is due to the reorientational motion of the organic cations possessing a permanent dipole moment.…”