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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic resonance of superparamagnetic iron-containing nanoparticles in annealed glass (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7389-7396 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work, we study borate glasses doped with a low concentration of iron oxide by X band (9.5 GHz) electron magnetic resonance. These glasses (composition: 0.63B2O3–0.37Li2O–0.75×10−3 Fe2O3 in mole %) were annealed at increasing temperatures Ta, starting at the glass transition temperature. A new composite resonance at gef(approximate)2.0 arises in the spectra measured at room temperature (300 K). The narrow component of this resonance is predominant in glasses annealed at lower Ta while the broad component increases in intensity as Ta increases. This resonance is ascribed to an assembly of superparamagnetic nanoparticles of a crystalline iron-containing compound. Numerical simulations assuming a lognormal particle volume distribution show that the mean particle diameter increases from 5.3 to 8.5 nm as Ta increases from 748 to 823 K. The integrated spectra intensity shows that the total number of spins in the nanoparticles increases rapidly with Ta. At lower anneal temperatures Ta, a striking increase occurs in the particle diameters, while at higher Ta these diameters reach a limit value. When the measurement temperature is increased, the resonance spectra show a reversible narrowing and an increase in intensity. The temperature dependence of the individual linewidths is attributed to thermal fluctuations of the orientations of the magnetic moments with respect to the magnetic anisotropy axes. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372998
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  • 2
    Electronic Resource
    Electronic Resource
    Die Sublimation von Plutoniumtetrafluorid (1961)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 44 (1961), S. 1084-1088 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The vapour pressure of PuF4 in the range of 1000-1300°K has been measured. Experiments indicate that PuF4 is the sublimed species up to the higher temperature limit. The possible disproportionation of PuF4 at temperatures above this or the secondary disproportionation in the gaseous phase cannot be ruled out.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19610440428
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