ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Mössbauer spectra of iron in β-silicon nitride, prepared from a mixture of silica and carbon and from metallic silicon, were measured under various conditions. Iron was introduced into the crystal as an impurity in carbon, and where necessary was further doped by means of thermal diffusion mainly in a nitrogen atmosphere. As a result, the spectra were observed to change in a complicated way, including a sudden change when the samples were highly exposed to γ-rays or heated at high temperatures. In addition, they were found to show significant ageing at room temperature. All these results were dependent on the doping procedure. Also, in the processes of doping different kinds of species containing iron were found to form inside and outside the crystal depending on the state of iron before the doping, even though the doping itself was performed for all the samples under almost the same conditions. Explanations are given for the former results in terms of dynamics of the iron and silicon, along with residual carbon atoms and vacancies which were left behind by those atoms in the heating process or newly generated in the irradiation process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00550244
