Conclusions
The results of our investigation of the reflection spectra of powders and sintered specimens of metallike lanthanum and praseodymium compounds have enabled us to determine the frequency of plasma oscillations of conduction electrons during interaction with light and assess the principal kinetic parameters with an error of 30%. The method employed is suitable for assessing the principal physical characteristics of charge carriers in those refractory compounds which cannot easily be produced in the form of monocrystalline or monolithic specimens with specular polished surfaces without disturbing their stoichiometry.
Values of plasma frequency of free charge carrier oscillations determined in this investigation have made it possible to compare, for all the compounds studied, the optical values of kinetic parameters determined with their aid with those yielded by galvanomagnetic measurements.
The optical values of electrical conductivity in the metal-like REE compounds and conduction electron mobility were found to be smaller than the values obtained in measurements involving the direct passage of current, probably as a result of the influence exerted by Interzonal electron transitions of similar energy on the plasma frequency of oscillations.
Examination of the optical characteristics of lanthanum and praseodymium compounds leads to the conclusion that the high concentration of conduction electrons in Me3+X, Me3+B6, and MeSb type refractory compounds is linked with a common feature of all these compounds, namely, the simple cubic lattice of their trivalent ion.
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Translated from Poroshkovaya Metallurgiya, No. 8(188), pp. 38–48, August, 1978.
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Ivanchenko, L.A., Paderno, Y.B. & Pilyankevich, A.N. Plasma light reflection by free charge carriers in some compounds of the rare earth elements. Powder Metall Met Ceram 17, 602–609 (1978). https://doi.org/10.1007/BF00797334
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DOI: https://doi.org/10.1007/BF00797334