Dielectric and Dilatometric Properties of NH(CH₃)₃CuCl₃·2H₂O Low Dimensional Ferroics

Abstract

On the basis of dilatometric and dielectric investigations of NH(CH3)3CuCl3 · 2H2O crystals the earlier unknown phase transition with considerable temperature hysteresis was found at T c 1 = 198 K and T h 1 = 223 K, respectively, in cooling and heating runs. Existence of the characteristic dielectric dispersion was revealed within the high-temperature phase. It corresponds to the single dielectric relaxator below 250 K as well as to co-existence of two relaxators above this temperature. The determined values of the activation energy and relaxation time are characteristic of the co-operative reorientation of the trimethylammonium cation (high-frequency relaxator) whereas the combined reorientation motions of the CuCl 2 · 2H 2 O chains would be responsible for the low-frequency relaxation process. It was found that the above mentioned quasi-Debye type processes are involved into the mechanisms of the protonic conductivity.

Exploring the Crystal Structure, Thermodynamics, and Molecular Dynamics of NH(CH3)3CuCl3·2H2O Organic–Inorganic Hybrid Perovskite

“…Ferroelasticity describes a phenomenon in which materials under external stress exhibit spontaneous strain induced by a phase transition between two equally stable phases, described mainly by lattice orientations. Ferroelastic materials exhibit phase transitions between ferroelastic and paraelastic phases. , Domain patterns arising from the ferroelastic property of the NH­(CH 3 ) 3 CuCl 3 ·2H 2 O crystal were investigated using an optical polarizing microscope (Figure ). The parallel lines in the images represent the twin domain walls, with each photograph captured after approximately 1 min of waiting time for temperature stabilization.…”

“…Ferroelastic materials exhibit phase transitions between ferroelastic and paraelastic phases. 31 , 32 Domain patterns arising from the ferroelastic property of the NH(CH 3 ) 3 CuCl 3 ·2H 2 O crystal were investigated using an optical polarizing microscope ( Figure 4 ). The parallel lines in the images represent the twin domain walls, with each photograph captured after approximately 1 min of waiting time for temperature stabilization.…”

Crystal structure of benzyl triphenyl phosphonium chlorometallate: Some surface and biological properties of their metallosurfactant derivatives

“…The coordination about each copper is intermediate between a planar and a tetrahedral arrangement of four chlorine ligands. Cu 1 -Cl 3 (2, 2943 (5) 10 . The Cl-Fe-Cl angles, ranging from 107.51(2)º to 11.18(2)º for Cl 5 -Fe 2 -Cl 10 to Cl 6 -Fe 1 -Cl 9 , indicate slight distortions of the tetrahedral.…”

“…Reaction of (1) or (2) The structure of the metallic anion in (1a) and (1b) may be determined by the distorted octahedral coordination of Cu 2+ , where the octahedrals form one dimensional chains by edgesharing [10]. While, the structure of (2a) and (2b) may be an octahedral geometry.…”

“…Studies on chloro and bromo complexes of copper(II) have been reported [9,10], in a special case, where the ratio [Cu 2+ ]:[X] = 1:3 (X = Cl, Br) has a monomeric three coordinate complex [9]. *Corresponding author.…”