Diffusion of nitrogen in R2Fe17 (R = rare earth) compounds determined by the Kissinger method

Diffusion of nitrogen in R2Fe17 (R =rare earth) compounds determined by the Kissinger method

The activation energy of nitrogen diffusion in R2Fe,, (R=rare earth) compounds has been determined by applying the Kissinger method to analyse the differential scanning calorimetry (DSC) traces of nitrogenated R2Fe1, compounds. The nitrogen outgas that starts when the nitrides are heated above about 300 “C is a typical decomposition reaction of the type solid + solid + gas to which the Kissinge...

Nitrogen diffusion mechanism in the R2Fe17 lattice

In this report, a diffusion analysis has been extended to a lattice containing two interstitial sites, and the results obtained are used to understand: ~1! the formation of a nitrided/unnitrided N configuration for intermediate N content and ~2! the abnormally small ~apparent! diffusion frequency factor, both of which characterize the newly developed R2Fe17 nitrides. It turns out that the diffu...

study of cohesive devices in the textbook of english for the students of apsychology by rastegarpour

this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...

comparison of catalytic activity of heteropoly compounds in the synthesis of bis(indolyl)alkanes.

heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...

Immobilization diffusion in R2Fe17 nitrides