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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 6 (1985), S. 501-512 
    ISSN: 0392-6737
    Keywords: Electronic density of state determinations (including energy states of liquid semiconductors)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È stato studiato l'effectto delle correlazioni coulombiane in bande di valenza di tipod non completamente piene, calcolando gli spettri XPS di banda di valenza per una lega ferromagnetica di Fe−Ni. Sono state effettuate misure di XPS sulle stesse bande, al fine di confrontare teoria ed esperimento. Da tale confronto si osserva come la teoria sia capace di riprodurre bene la larghezza e la forma della bande.
    Abstract: Резюме В рамках недавно предложенной приближенной теории рассматривается эффект кулоновских корреляций в частично заполненных валентныхd-зонах, производя вычисления перенормированных спектров валентной зоны для сплавов с концентрациями железа 20% и 50%. Для тех же концентраций проводится измерение формы XPS валентной зоны с целью сравнения результатов расчета с экспериментальными данными. Оказывается, что экспериментальные ширины и формы эон хорошо описываются указанной теорией.
    Notes: Summary The effect of the Coulomb correlations in partially filled valenced-bands has been considered by computing the renormalized valence band spectra for alloys having Fe concentrations of 20% and 50%, according to a recently proposed approximate theory. In order to have a comparison with experimental data, the XPS valence band shape has been measured for the same concentrations. The experimental widths and shapes of the bands turn out to be well reproduced by the theory.
    Type of Medium: Electronic Resource
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  • 2
    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 Two titanate minerals, zirconolite with perovskite minor phase inclusions, have been subjected to hydrothermal chemical attack. The effects of the treatment have been investigated with scanning and high-resolution Auger analysis. The results suggest that both mineral surfaces act as substrates for carbonate precipitation. Dissolution was found to be the main mechanism of attack for perovskite, followed by precipitation from solution and growth of TiO2 on the perovskite phase regions. There was also precipitation of calcium as fluoride and phosphate, and growth of these crystallites at random locations on the surface of the two-phase ensemble. The zirconolite phase regions were not affected by the hydrothermal treatment, within the resolution of the present experiment.
    Type of Medium: Electronic Resource
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