Dielectric properties and absorption spectra of trimethylammonium trichlorcobaltate dihydrate single crystals

Abstract

The dielectric and spectral properties of [NH(CH 3 ) 3 ]CoCl 3 × 2H 2 O (abbreviately TrMA-CoCl 3 ) crystals were investigated in the temperature region of 293-345 K. The anomalous behaviour of the investigated parameters at T 1 = 327 K was related to early unknown phase transition. The considerable change of the absorption spectra at T 1 is explained by the distorsion and the corresponding change of symmetry of the polyhedron around Co 2+ ion.

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

“…Equation (1) should be considered as a sequence of relation (2). The relaxation time τ is connected with the loss peak frequency as f p = 1/2πτ .…”

“…The related crystals with general (39) formulae AMeCl 3 · 2H 2 O and AMeCl 3 (A = N(CH 3 ) 4 , NH(CH 3 ) 3 , NH 2 (CH 3 ) 2 ; Me = Cu, Co, Mn, Ni) have been the object of considerable attention during the past years [2][3][4][5][6][7] first of all due to their specific magnetic properties at low temperatures [2][3][4][5]7].…”

Band structure and optical electron spectra of (TrMA)CoCl3·2H2O crystal

“…Small parts of the spectra are shown in Fig. 7 together with the known experimental data [7]. As follows from the presented analysis of the band structure and density of states of the TrMA-CoCl 3 crystal, its optical spectra in the range of 0-4 eV are formed almost entirely by the transitions between d electron states of Co atoms.…”

“…[1], and the investigations of the crystal field spectra [2] have been studied in the temperature range of 15-300 K. The investigations of their dielectric characteristics, optical absorption spectra in the range of 293-345 K and their qualitative interpretation were done in Ref. [7]. There are no references on the first-principles band structure calculation for this crystal; however, such data could be useful for a better understanding of the available experimental data.…”

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

“…Numerous studies on organic–inorganic hybrid ABX 3 compounds have yielded meaningful results owing to their broad applicability. In recent efforts to develop advanced materials, researchers have focused on developing materials with ABX 3 stoichiometry, where A represents the organic cation (A = NH 3 CH 3 , NH 2 (CH 3 ) 2 , NH­(CH 3 ) 3 , and N­(CH 3 ) 4 ), B denotes the metal cation (B = Co, Zn, Cu, Mn, and Cd), and X denotes the halide anion (X = Cl, Br, and I) for highly efficient photovoltaic applications at a low cost. ,− Crystals with general formulas ABCl 3 ·2H 2 O and ABCl 3 have garnered considerable attention in recent years due to their specific magnetic properties at low temperatures. Most of these materials undergo multiple structural phase transitions, often related to the reorientation dynamics of the substituted ammonium group.…”