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Digitale Medien

Measurement of Debye temperature from the zero-field splitting of Ni2+ in ZnSiF6⋅6H2O (1988)

Shrivastava, Keshav N. ; Rubenacker, Gerald V. ; Hutton, Stuart L. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 88 (1988), S. 634-636

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: The variation of the zero-field splitting parameter D for Ni2+ in ZnSiF6⋅6H2O between 4 and 250 K has been used to calculate the temperature dependence of the Debye temperature θD(T) in ZnSiF6⋅6H2O. θD(T) was determined to be 143 K at a temperature of 30 K and 127 K at 250 K. There was a pronounced minimum of 105 K in θD(T) near 60 K. The behavior of θD(T) is qualitatively similar to that found for alkali halides from specific heat data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.454190

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2

Digitale Medien

Temperature dependence of the g value of Ni2+ in ZnSiF6⋅6H2O (1988)

Shrivastava, Keshav N. ; Rubins, R. S. ; Hutton, Stuart ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 88 (1988), S. 705-706

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: The measured increase in g(parallel) between 4 and 100 K for Ni2+ in ZnSiF6⋅H2O has been explained as a consequence of the dynamical phonon coupling between the spins and the lattice. The Debye temperature of θ=130 K previously determined from the zero-field splitting has been found to agree with that obtained from the temperature dependence of the g value. The zero-point vibrational correction to the g value has been deduced.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.454148

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3

Digitale Medien

Temperature dependence of the Mössbauer isomer shift (1985)

Shrivastava, Keshav N.

Springer

Hyperfine interactions 26 (1985), S. 817-843

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The isomer shift for nuclei in solids is calculated taking into account the core electron charge density, the overlap effects, the charge transfer effects, and the crystal field effects. The importance of the dynamical electron phonon interaction is pointed out. It is found that the phonon-induced dynamical configurational mixing and the dynamical charge transfer play an important role and contribute to a dynamical isomer shift which enhances the temperature-dependent second-order Doppler shift. It is found that the internal conversion and the electron capture give information which is related to the isomer shift. In mixedvalence compounds such as EuCu2Si2, the center shift of the Mössbauer lines has been explained as if arising from the phonon-induced dynamical isomer shift.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02354640

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