Determination of optical constants and polarizability studies on ferroic Tetramethylammonium Tetracholorozincate crystal

Kalyanaraman, S.; Shajinshinu, P.M.; Vijayalakshmi, S.

doi:10.1016/j.physb.2015.12.009

Cited by 26 publications

(9 citation statements)

References 24 publications

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“…The observed band positions are very similar to the [TMA] 2 ZnCl 4 spectrum. 25 The peak around 692 nm in [DMA] 2 ZnCl 4 spectrum can be assigned to –NH– species.…”

Section: Resultsmentioning

confidence: 99%

Optical studies and dielectric response of [DMA]₂MCl₄(M = Zn and Co) and [DMA]₂ZnBr₄

2021

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“…The observed band positions are very similar to the [TMA] 2 ZnCl 4 spectrum. 25 The peak around 692 nm in [DMA] 2 ZnCl 4 spectrum can be assigned to –NH– species.…”

Section: Resultsmentioning

confidence: 99%

Optical studies and dielectric response of [DMA]₂MCl₄(M = Zn and Co) and [DMA]₂ZnBr₄

2021

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“…The optical band gap value is determined using Tauc's expression for direct band transition [ 24 ] :

{(italicαhν)}^{2} = B ((), italichν - E_{g})

…”

Section: Resultsmentioning

confidence: 99%

Higher temperature order–disorder transition, electrical and optical properties of [N(C₂H₅)₄]₂Pd₂Cl₆compound

Dakhlaoui

Karoui

Hajaloui

et al. 2020

Applied Organom Chemis

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[N(C2H5)4]2Pd2Cl6 hybrid compound with semiconducting character was synthetized and characterized by X‐ray diffraction, the thermal, optical and electrical properties. X‐ray diffraction indicates that the compound crystallize at room temperature in the orthorhombic system and (Immm) space group. Two endothermic peaks at, 343 K and 440 K were observed in the DSC measurements corresponding to the evaporation of water molecules and order‐disorder transition, respectively. The optical band gap (Eg = 4.34 eV) was deduced by the Tauc relation. The electrical properties was studied using the impedance spectroscopy in the frequency range of 0.1 Hz to 1 MHz and over the temperature range of 270 K to 480 K. The analysis of Nyquist plots revealed the presence of grains, grain boundaries and the electrode effects. The equivalent circuit was determined. The Ac conductivity was analyzed by the Jonsher low and the conduction mechanism was deduced based in the Elliot theory and indicate that the correlated barrier hopping model (CBH) was described the two regions II and IV and the overlapping polaron model (OLPT) the right model described the conduction in the regions I and III.

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“…For the determination of the value of E g , the best fit was obtained from a plot of ( αhυ ) versus the photon energy ( hυ ) for n = ½ (Figure ). Therefore, the optical bandgap value is found to be 3.84 eV and the transition is indirect, which suggests that the material behaves as semiconductor and is consistent with the dark blue color of the crystal . This value is small with respect to the reported values for [(CH 3 ) 2 NH 2 ] 2 ZnCl 4 (4.29 eV) and [N(CH 3 ) 4 ] 2 CoCl 4 (4.59 eV) and greater with regards to those for [C 8 H 10 NO] 2 CoCl 4 (2.98 eV).…”

Section: Resultsmentioning

confidence: 48%

“…The relation between the incident photon energy ( hν ) and absorption coefficient and near the fundamental absorption edge can be written as

F ((), R) italichν = B {(hν - E_{normalg})}^{n}

with

F ((), R) = \frac{{(1 - R)}^{2}}{2 R}

where R is the reflectance of light, F ( R ) is the Kubelka–Munk function, h is Planck's constant, ν is the frequency of the incident photon, B is a constant, E g is the optical bandgap and n is an index, which takes different values depending on the mechanism of interband transitions: n = 2 and ½ correspond to indirect and direct transitions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Optical and electrical properties and conduction mechanism of [(CH₃)₂NH₂]₂CoCl₄

Mahfoudh

Karoui

Gargouri

et al. 2020

Applied Organom Chemis

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Monoclinic crystals of [(CH3)2NH2]2CoCl4 are of the space group P21/n. Unit cell dimensions are as follows: a = 8.5393 Å, b = 11.3905 Å, c = 13.4069 Å and β = 91.02°. This compound undergoes several phase transitions. The optical properties were measured by means of UV–visible absorption spectroscopy in the range 200–800 nm. Analysis of the data revealed the existence of direct allowed optical transition mechanisms with bandgap energy equal to 3.84 eV. The electrical conductivity of [(CH3)2NH2]2CoCl4 was studied in the frequency range 10−1–106 Hz and in the temperature range 411–449 K by means of impedance spectroscopy. Impedance and modulus analyses indicated temperature‐independent distribution of relaxation times and non‐Debye behavior in this material. A super‐linear power law was observed for the AC conductivity, which was analyzed based on the jump relaxation model σac = σdc + A1ωs1 + A2ωs2. Accordingly, the first AC term A1ωs1 corresponds to translational hopping motion and the second term A2ωs2 to well‐localized hopping and/or reorientational motion. Conduction takes place via correlated barrier hopping in phases I and II.

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Determination of optical constants and polarizability studies on ferroic Tetramethylammonium Tetracholorozincate crystal

Cited by 26 publications

References 24 publications

Optical studies and dielectric response of [DMA]₂MCl₄(M = Zn and Co) and [DMA]₂ZnBr₄

Optical studies and dielectric response of [DMA]₂MCl₄(M = Zn and Co) and [DMA]₂ZnBr₄

Higher temperature order–disorder transition, electrical and optical properties of [N(C₂H₅)₄]₂Pd₂Cl₆compound

Optical and electrical properties and conduction mechanism of [(CH₃)₂NH₂]₂CoCl₄

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Determination of optical constants and polarizability studies on ferroic Tetramethylammonium Tetracholorozincate crystal

Cited by 26 publications

References 24 publications

Optical studies and dielectric response of [DMA]2MCl4(M = Zn and Co) and [DMA]2ZnBr4

Optical studies and dielectric response of [DMA]2MCl4(M = Zn and Co) and [DMA]2ZnBr4

Higher temperature order–disorder transition, electrical and optical properties of [N(C2H5)4]2Pd2Cl6compound

Optical and electrical properties and conduction mechanism of [(CH3)2NH2]2CoCl4

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Optical studies and dielectric response of [DMA]₂MCl₄(M = Zn and Co) and [DMA]₂ZnBr₄

Optical studies and dielectric response of [DMA]₂MCl₄(M = Zn and Co) and [DMA]₂ZnBr₄

Higher temperature order–disorder transition, electrical and optical properties of [N(C₂H₅)₄]₂Pd₂Cl₆compound

Optical and electrical properties and conduction mechanism of [(CH₃)₂NH₂]₂CoCl₄