We measured the anelastic, dielectric and structural properties of the metal-free molecular perovskite (ABX3 ) (MDABCO)(NH4 )I3 , which has already been demonstrated to become ferroelectric below T C =448 K. Both the dielectric permittivity measured in air on discs pressed from powder and the...
of 0.63 K m MV-1 at 30 MV m-1,respectively.The prominent electrocaloric effects of MDABCO(NH4)I3 may be related to its rapid change rates of free energy barrier height.Additionally,it can be found that some stripe domains and non-180°domain walls form in the[MDABCO](NH4)I3 bulk,whic...