scholarly journals High-pressure Effect of Elastic and Mechanical Properties of Hexagonal Gallium Nitride

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Nelson Nenuwe ◽  
Ezekiel O Agbalagba
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Phase Transition ◽  
Gallium Nitride ◽  
Pressure Range ◽  
Pressure Effect ◽  
Theoretical Data ◽  
Linear Behavior ◽  
Classical Potential ◽  
High Pressure Effect

This study examines an effect of pressure up to 50 GPa on the elastic and mechanical properties of wurtzite gallium nitride (w-GaN) by using classical potential within the Atomistic Tool Kit (ATK)-force field. The obtained results show that the elastic constants and other related parameters, such as Young’s modulus, shear modulus, bulk modulus, Poisson’s ratio, Pugh’s ratio, Zener anisotropy factor and Kleinman parameter increase monotonically with increase of pressure up to 32 GPa. Beyond this pressure, we observed a non-linear behavior with increase in pressure. This might be attributed to the phase transition in GaN in the pressure range of 33.4 - 44.6 GPa. The results obtained for zero pressure are consistent with both experimental data and the theoretical data shown in references.

High pressure effect on structural and mechanical properties of some LnO (Ln=Sm, Eu, Yb) compounds

2011 ◽  
Vol 406 (11) ◽  
pp. 2158-2162 ◽  
Author(s):  
Vipul Srivastava ◽  
Sanjay Bhajanker ◽  
Sankar P. Sanyal
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Pressure Effect ◽  
High Pressure Effect

High pressure effect on the phase transition and in-plane anisotropy of SnSe

2020 ◽  
Vol 849 ◽  
pp. 155915
Author(s):  
Shiyu Xie ◽  
Xuerui Cheng ◽  
Chuansheng Hu ◽  
Yajun Tao ◽  
Miao Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Pressure Effect ◽  
Plane Anisotropy ◽  
High Pressure Effect

High pressure effect on the crystal structure of the BaTiO3

2019 ◽  
Vol 33 (30) ◽  
pp. 1950357
Author(s):  
Sakin H. Jabarov
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
High Pressure ◽  
Pressure Effect ◽  
Theoretical Calculations ◽  
Cubic Phase ◽  
Spontaneous Strain ◽  
Experimental Values ◽  
Murnaghan Equation ◽  
High Pressure Effect

Crystal structure of [Formula: see text] compound was studied using Atomistix Tool Kit software program at high pressure. It is defined that in this combination, tetragonal–cubic phase transition occurs under high pressure [Formula: see text] GPa. The character of this phase transition is explained in respect of baric dependence of spontaneous strain. Birch–Murnaghan equation is solved, compression ratio is determined. Results gained by theoretical calculations are compared with experimental values.

scholarly journals Mechanical properties of sunflower oil under pressure

2021 ◽  
Author(s):  
L. T. Pawlicki ◽  
A. J. Rostocki ◽  
D. B. Tefelski ◽  
R. M. Siegoczyński ◽  
S. Ptasznik
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
High Pressure ◽  
Sunflower Oil ◽  
Pressure Range ◽  
Step Change ◽  
Double Crystal ◽  
First Order ◽  
Stepwise Method ◽  
First Order Phase

AbstractThis article presents the results of research on the influence of high pressure on the mechanical properties of sunflower oil. The pressure value was changed by the stepwise method to obtain thermodynamic equilibrium. Dependencies of changes in the volume and compressibility of sunflower oil on pressure were investigated. A discontinuous (step) change was observed indicating the appearance of the first order phase transformation. The phase transition for sunflower oil was observed in the pressure range from 450 to 500 MPa after about 170 h. Most likely, then, there was a change to the double crystal phase. The time after which this transformation took place was the longest of all times that the authors have observed so far for the study.

Void pattern fluctuation in p-AgBr interactions at 400 GeV/c

2016 ◽  
pp. 4115-4125
Author(s):  
Argha Deb
Keyword(s):  
Experimental Data ◽  
Phase Transition ◽  
Phase Space ◽  
Second Order ◽  
Hadron Phase

The event-by-event fluctuation of hadronic patterns is investigated by finding a measure of the non-hadronic regions, the voids, for the experimental data of p-AgBr interactions at 400 GeV/c considering the anisotropy of phase space. Two moments of the event-to-event fluctuation of voids, <Gq> and Sq have been calculated as defined by R. C. Hwa and Q. H. Zhang to quantify the dependence of the voids on the bin sizes. The results suggest that no quark-hadron phase transition of second order have taken place for p-AgBr interactions at 400 GeV/c. The result have been compared with the result of VENUS generated data.

scholarly journals An Additive Model to Predict the Rheological and Mechanical Properties of Polypropylene Blends Made by Virgin and Reprocessed Components

Recycling ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 2
Author(s):  
Francesco Paolo La Mantia ◽  
Maria Chiara Mistretta ◽  
Vincenzo Titone
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Additive Model ◽  
Industrial Process ◽  
Theoretical Predictions ◽  
Experimental Values ◽  
Polypropylene Blends ◽  
Polypropylene Sample

In this work, an additive model for the prediction of the rheological and mechanical properties of monopolymer blends made by virgin and reprocessed components is proposed. A polypropylene sample has been reprocessed more times in an extruder and monopolymer blends have been prepared by simulating an industrial process. The scraps are exposed to regrinding and are melt reprocessed before mixing with the virgin polymer. The reprocessed polymer is, then, subjected to some thermomechanical degradation. Rheological and mechanical experimental data have been compared with the theoretical predictions. The results obtained showed that the values of this simple additive model are a very good fit for the experimental values of both rheological and mechanical properties.

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