Journal of Ultra Scientist of Physical Sciences - B
Voulume: 28
Issue: 4
Article No. 1
Sol gel synthesis and optical characterization of the SrAlO:Dy nano phosphor

1Research Centre, S.T. Hindu College, Nagercoil-629 002, Tamilnadu (India)
2Malankara catholic college,kaliyakavilai,kk.district.
Email of corresponding author:-

Abstract :

Dy doped SrAlOnano phosphors were synthesized by adopting a simple Sol-Gel Method. X-Ray Diffraction (XRD) profile confirms the monoclinic nature of Dydoped SrAlOnano phosphors. The results show that SrAlO:Dy with an average particle size of 80 nm is formed. In addition, Scanning electron microscopy (SEM), Photoluminescence(PL) and Fourier-Transform IR spectroscopy (FTIR) were also used to characterize the synthesized phosphor. The efficiency of the prepared phosphors was analyzed by means of its emission spectral profiles. We also observed a rich IR emission from the prepared phosphors under a Ultra-Violet (UV) source. Such luminescent powders are expected to be
applied as IR sensor and MRI device applications.

Keyword : Phosphors, optical properties, luminescence, XRD, SEM, Dysposium.
Paper Download Count : 857
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Article No. 2
MHD flow and heat transfer of a third grade fluid in wire coating analysis with variable viscosity in a porous medium inspired by internal heat generation/absorption

Department of Physics, Radhakrishna Institute of Technology and Engineering, BijuPatnaik University of Technology, Odisha (India)

Abstract :

Wire coating process is a continuous extrusion process for primary insulation of conducting wires with molten polymer for mechanical strength and protection in aggressive environments. In the present study wire coating is performed using melt polymer satisfying third grade fluid model. The novelty of this study is to analyze the effect of porosity, internal heat generation/absorption and varying temperature dependent viscosity on the wire coating. In the present discussion (i) Reynolds Model (ii) Vogel’s Model are considered to account for temperature dependent viscosity. The flow and heat transfer in a pressure type die have been investigated. The equations characterizing the flow and heat transfer phenomena are solved numerically by fourth order Runge-Kutta method and the effects of pertinent parameters are displayed with the help of graphs. It is interesting to remark that an increase in non-Newtonian parameter increases the velocity in the absence of porous matrix which coincides with the results reported earlier but in the presence of porous matrix the velocity decreases in the entire span of the flow domain. One of the important aspects of the present study is that thermal boundary layer generates energy which causes an enhancement in temperature with an increase in heat generation parameter whereas for the case of heat absorption, the temperature decreases. Further, the flow instability in the flows of extrusion die is well marked in case of Vogel’s model as pointed out by Nhan-Phan- Thien.

Keyword : Wire coating, Reynolds model, Vogel’s model, Third grade fluid, Porosity, Heat generation/absorption
Paper Download Count : 450
View Count : 444
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Article No. 3
Growth, Micro hardness and Dielectric Studies on the NLO Material Tristhiourea potassium chloride crystals

1Department of Physics, MalankaraCatholicCollege,Mariagiri, Tami Nadu (India)
2Physics Research Centre, S.T. Hindu College, Nagercoil, Tamil Nadu (India)
Corresponding author Email:- (

Abstract :

Metal organic compounds as NLO materials have attracted much more attention for the high NLO efficiency, stable, physicochemical properties and better mechanical intentionTristhiourea potassium chloride single crystals (TTPC) were grown by slow evaporation method under room temperature. The grown crystals were subjected to single crystal XRD analysis and confirm its structure and lattice parameters. The SHG efficiency of grown crystal could enhance nonlinearity behavior. Inaddition the electrical parameters such as dielectric constant confirms the NLO property.

Keyword : Crystal growth, SXRD, NLO, Dielectric constant
Paper Download Count : 572
View Count : 478
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