Activation energies for impurities in vanadium from measurements of internal friction
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Activation energies for impurities in vanadium from measurements of internal friction

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Published .
Written in English


  • Vanadium.,
  • Internal friction.

Book details:

Edition Notes

Other titlesImpurities in Vanadium.
Statementby Shanker Prasad Pradhan.
The Physical Object
Pagination96 leaves, bound :
Number of Pages96
ID Numbers
Open LibraryOL14330627M

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Title: Activation Energies for Impurities in Vanadium from Measurements of Internal Friction. Authors: Pradhan, Shanker Prasad: Affiliation: AA(OREGON STATE UNIVERSITY.). The long-range diffusion (Gorsky effect) of hydrogen and deuterium in vanadium is invesitgated by internal friction measurements in the temperature range from to °K; the vibration frequencies are included between 8 and 68 by: Annealing of neutron-irradiated vanadium was investigated in the temperature range –°C using internal friction and resistivity measurements. The results indicate that the resistivity annealing stage at about °C is due to the migration of interstitial oxygen and carbon to radiation-produced defects, possibly small dislocation by: The temperature dependences of the internal friction, Q −1, of vanadium and of V-(–10%) Ti alloys are measured in the range from room temperature to °C.

This book is a unique collection of experimental data in the field of internal friction, anelastic relaxation, and damping properties of metallic materials. It reviews virtually all anelastic relaxation phenomena ever published, and also most of the internal friction effects based on other types of dissipation of mechanical (elastic) energy. Internal friction. Measuring temperature dependences of logarithmic decrement damping of oscillations (abbreviation IF for later use to denote of internal friction) is one of the methods for investigation allowing to ex-plain the processes occurring in the interaction of alloy atoms with interstitial impurities. Vanadium.   where k represents the rate constant, E a is the activation energy, R is the gas constant ( J/K mol), and T is the temperature expressed in Kelvin. A is known as the frequency factor, having units of L mol -1 s -1, and takes into account the frequency of reactions and likelihood of correct molecular : Jessie A. Key. Internal friction experiments on Nb-0 and V-0 alloys ( to at %) using the same samples for oscillations at about 1 Hz and 1 kHz were performed to accurately determine the Snoek relaxation.

For example, metal-hydrogen systems or defect configuration or defect structure and containing interstitial impurities have been shown to can sometimes be inferred from internal friction exhibit hindered ordered-phase precipitation [], measurements. positive deviations from Sievert's law [4,5], increased In order to investigate the nature of the electrical conductivity [2,3], and decreased diffusion hydrogen-impurity interaction Cited by: Measurements have been made of the thermal and optical activation The temperature dependence of the broad chromium level may be written in the energies of chromium, iron and nickel in gallium arsenide. form E=0+31+x lO-4Tev for T>IOO"K E=+0,01 ev for T+o"K where E is measured from the conduction by: The stability of typical vanadium flow battery (VFB) catholytes was investigated at temperatures in the range °C for VV concentrations of mol dm⁻³ and sulfate concentrations of 3. The activation energies for the migration of nitrogen and oxygen interstitials in niobium, tantalum and vanadium have been calculated by using a Green function method and a model based upon the.