OPTICAL AND MECHANICAL PROPERTIES OF MgCl2 ADDED TRIGLYCINE SULPHATE SINGLE CRYSTALS

2012 ◽  
Vol 26 (09) ◽  
pp. 1250038 ◽  
Author(s):  
V. KRISHNAKUMAR ◽  
M. RAJABOOPATHI ◽  
R. NAGALAKSHMI
Keyword(s):  
Mechanical Properties ◽  
Refractive Index ◽  
Single Crystals ◽  
Energy Gap ◽  
Optical Transition ◽  
X Ray Diffraction ◽  
Triglycine Sulphate ◽  
Interband Optical Transition ◽  
Optical And Mechanical Properties ◽  
Parameter Values

This paper discusses the optical and mechanical properties of triglycine sulphate (TGS) and MgCl 2 added TGS single crystals (McTGS) grown from aqueous solution at room temperature using slow evaporation solution growth technique. The grown crystals were characterized by powder X-ray diffraction technique and the cell parameter values are found to be a = 9.405 Å, b = 12.623 Å and c = 5.721 Å; β = 110.347° with V = 637.001 Å3. UV-Vis-NIR study shows the direct type transition is involved in these materials and indirect, phonon energy gap of McTGS crystals have also been calculated, and these values are less than the TGS crystals. Refractive index and real and imaginary part of the dielectric constant have been discussed for grown crystals. The value of interband optical transition and oscillator energy has been determined by analyzing refractive index with incident energy. Vickers microhardness test was used to determine hardness number, fracture toughness, brittleness index, yield strength and types of crack formed in the crystals.

scholarly journals Estimation of optical parameters of silicon single crystals with different orientations

2019 ◽  
Vol 37 (1) ◽  
pp. 65-70
Author(s):  
M.M. El-Nahass ◽  
H.A.M. Ali
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Single Crystals ◽  
Energy Gap ◽  
Optical Parameters ◽  
Dispersion Energy ◽  
High Frequency Dielectric Constant ◽  
Single Oscillator Model ◽  
Indirect Allowed Transition ◽  
Single Oscillator

AbstractOptical properties of Si single crystals with different orientations (1 0 0) and (1 1 1) were investigated using spectrophotometric measurements in a spectral range of 200 nm to 2500 nm. The data of optical absorption revealed an indirect allowed transition with energy gap of 1.1 ± 0.025 eV. An anomalous dispersion in refractive index. The normal dispersion of the refractive index was discussed according to Wemple-DiDomenico single oscillator model. The oscillator energy Eo, dispersion energy Ed, high frequency dielectric constant ∈∞, lattice dielectric constant ∈L and electronic polarizability αe were estimated. The real ∈1 and imaginary ∈2 parts of dielectric constant were also determined.

ELECTRONIC, OPTICAL AND MECHANICAL PROPERTIES OF AIIBVI SEMICONDUCTORS

2012 ◽  
Vol 26 (08) ◽  
pp. 1250020 ◽  
Author(s):  
DHEERENDRA SINGH YADAV ◽  
A. S. VERMA
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Energy Gap ◽  
Average Energy ◽  
Compound Semiconductors ◽  
Electronic Polarizability ◽  
Zinc Blende ◽  
Energy Gaps ◽  
Optical And Mechanical Properties ◽  
Good Agreement

The modified dielectric theory of solids is applied to investigate electronic, optical and mechanical properties of A II B VI binary semiconductors ( ZnO, ZnS, ZnSe, ZnTe, CdO, CdS, CdSe, CdTe, HgS, HgSe & HgTe ). The values of homopolar gaps (Eh), heteropolar gaps (Ec) and average energy gaps (Eg) were evaluated for these A II B VI groups of binary semiconductors with Zinc-blende (ZB) structure. The derived values of average energy gap (Eg) were found to be in excellent agreement with the values obtained from the Penn model except ZnO . The electronic polarizability was investigated using Chemla's relation and the values were found to be in a very good agreement with the results obtained from the Clausius–Mossotti relation. The crystal ionicity (fi) was evaluated and the obtained values were compared with the values obtained by different researchers. The evaluated values of crystal ionicity were used to calculate the electronic, optical, mechanical properties such as bulk modulus (B in GPa) cohesive energy or total energy (U in Ryd. electron) and microhardness (H in GPa) of these compound semiconductors. A good agreement has been found between calculated and experimental data.

scholarly journals Alteration of the Optical and Mechanical Characteristics of Cellulose Nanofibre Films Under Thermal Treatment

2021 ◽  
Author(s):  
Ilpo Niskanen ◽  
Kaitao Zhang ◽  
Henrikki Liimatainen ◽  
Shuhei Shibata ◽  
Nathan Hagen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Refractive Index ◽  
Complex Refractive Index ◽  
Crystallinity Index ◽  
Significant Deterioration ◽  
Optical And Mechanical Properties ◽  
Cnf Films ◽  
Colour Complex ◽  
Thermal Stability Of ◽  
Crucial Characteristic

Abstract Nanocelluloses and their different designs, such as films and nanopapers, have gained considerable interest in many application areas due to their unique properties. For many purposes, such as for packaging and electronics, the thermal stability of nanocellulose materials is a crucial characteristic. In this study, the effects of heat treatment (100ºC, 150ºC and 200ºC) on the optical and mechanical properties of 2,2,6,6-tetramethylpiperidinyl-1-oxy radical-oxidised cellulose nanofibre (TO-CNF) films were investigated, especially the alteration of the colour, complex refractive index and birefringence of the films. Exposing TO-CNF films to high temperatures (> 150ºC) induced permanent transformations in the CNF structure, leading to an increase in the refractive index, decreases in the birefringence and crystallinity index, colour darkening and significant deterioration of the mechanical properties.

Investigations on the electrical and mechanical properties of triglycine sulphate single crystals modified with some rare earth metal ions

2003 ◽  
Vol 57 (21) ◽  
pp. 3291-3295 ◽  
Author(s):  
R Muralidharan ◽  
R Mohankumar ◽  
R Dhanasekaran ◽  
A.K Tirupathi ◽  
R Jayavel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Metal Ions ◽  
Single Crystals ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Triglycine Sulphate
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