scholarly journals Elastic constants and volume changes associated with two high-pressure rhombohedral phase transformations in vanadium

2008 ◽  
Vol 77 (13) ◽  
Author(s):  
Byeongchan Lee ◽  
Robert E. Rudd ◽  
John E. Klepeis ◽  
Richard Becker
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Elastic Constants ◽  
Rhombohedral Phase ◽  
Volume Changes

Effect of Phase Transformations on Hardness of Semiconductors

1997 ◽  
Vol 481 ◽  
Author(s):  
B. A. Galanov ◽  
O. N. Grigor'ev ◽  
Y. G. Gogotsi
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Experimental Work ◽  
Mott Transition ◽  
Volume Changes ◽  
Contact Loading ◽  
Significant Volume ◽  
Reversible Phase

ABSTRACTModels that describe hardness of materials do not account for stress-induced phase transformations that occur under sharp indenters. However, experimental work shows that some materials can be transformed under the indenter into new, high-pressure phases with properties that differ significantly from those of the pristine material. In particular, semiconductors (Si, Ge and other) experience Herzfeld-Mott transition (metallization). Significant volume changes can accompany these transformations. In the present paper, Tanaka's model [1] has been modified to account for reversible phase transformations under contact loading.

The Inductive Coil Technique for High-Pressure Measurements: An Analysis of Nonhomogeneous Material Environment as a Source of Irreproducibility and Error

1967 ◽  
Vol 89 (3) ◽  
pp. 554-560 ◽  
Author(s):  
A. A. Giardini
Keyword(s):  
High Pressure ◽  
Internal Pressure ◽  
Elastic Constants ◽  
Graphical Form ◽  
Pressure Measurements ◽  
Pressure Data ◽  
Nonhomogeneous Material ◽  
Resistivity Measurements ◽  
Material Environment ◽  
Critical Yield

Significant sources of error independent of the apparatus are analyzed on the basis of experimental experience and elastic theory. All are mechanical in nature and subject to corrective action. The most serious is found to be self-generating internal pressure differences which result from differential elastic and dimensional values in multicomponent assemblies. High-pressure data on elastic constants, relative critical yield stresses, radial displacements, and ratios of external to internal pressure for various compositional arrangements of pyrophyllite, MgO, NaCl, and AgCl are given in graphical form. Observance of suggested corrective measures can render the inductive coil technique capable of operational accuracies of 2 percent or better in compressibility and resistivity measurements.

scholarly journals Role of temperature in the numerical analysis of CaO under high pressure

2010 ◽  
Vol 8 (1) ◽  
pp. 126-133 ◽  
Author(s):  
Purvee Bhardwaj ◽  
Sadhna Singh
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Numerical Analysis ◽  
Thermodynamic Properties ◽  
Elastic Constants ◽  
Volume Change ◽  
Thermodynamical Properties ◽  
Phase Transition Pressure ◽  
Different Temperatures

AbstractIn this paper we focus on the elastic and thermodynamic properties of the B1 phase of CaO by using the modified TBP model, including the role of temperature. We have successfully obtained the phase transition pressure and volume change at different temperatures. In addition elastic constants and bulk modulus of B1 phase of CaO at different temperatures are discussed. Our results are comparable with the previous ones at high temperatures and pressures. The thermodynamical properties of the B1 phase of CaO are also predicted.

Phase transformations in Zr under high-pressure and shear deformation treatment

2019 ◽  
Vol 6 (4) ◽  
pp. 046506 ◽  
Author(s):  
A A Yaroslavzev ◽  
I A Evdokimov ◽  
B A Kulnitskiy ◽  
I A Perezhogin ◽  
V D Blank ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Shear Deformation ◽  
Deformation Treatment
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