Intercalate Phonon Densities of States for Alkali-Graphite Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
W. A. Kamitakahara ◽  
H. Zabel
Keyword(s):  
Neutron Scattering ◽  
Temperature Dependence ◽  
Basal Plane ◽  
Densities Of States

ABSTRACTNeutron scattering methods have been used to determine the partial phonon densities of states gM(ν) for inplane vibrations of M atoms in MCx compounds, where M = K, Rb or Cs, and x = 8, 24, 36. Only modes with both phonon wave vectors and displacements in the basal plane are represented in gM(ν). Detailed measurements of the temperature dependence were made for RbC24 and KC24, in order to study the influence of the order-disorder transformations in these compounds. The results are interpreted in terms of different pictures of the disordered state.

Temperature dependence of the dynamic scattering function in glycerol studied by quasi-elastic slow neutron scattering

2002 ◽  
Vol 74 (0) ◽  
pp. s1342-s1344 ◽  
Author(s):  
I. Padureanu ◽  
R.E. Lechner ◽  
D. Aranghel ◽  
A. Radulescu ◽  
A. Desmedt ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Temperature Dependence ◽  
Slow Neutron ◽  
Scattering Function ◽  
Dynamic Scattering

Determination of γ′ solution temperature in Re-rich Ni-base superalloy by small-angle neutron scattering

2001 ◽  
Vol 34 (5) ◽  
pp. 541-548 ◽  
Author(s):  
Pavel Strunz ◽  
Debashis Mukherji ◽  
Ralph Gilles ◽  
Albrecht Wiedenmann ◽  
Hartmut Fuess
Keyword(s):  
Neutron Scattering ◽  
Temperature Dependence ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Volume Fraction ◽  
Solidus Temperature ◽  
Solution Temperature ◽  
Incipient Melting ◽  
Relative Volume Fraction

A harmful segregation of heavy elements (e.g.W, Mo, Re) during solidification of Ni-base superalloys can only be eliminated by using a homogenizing heat treatment, which needs to be carried out in the single-phase (γ) field above the γ′ solvus temperature but below the solidus temperature. Small-angle neutron scattering (SANS) was employed forin situobservation of the dissolution of precipitates in an Re-rich superalloy. The temperature dependence of the relative volume fraction and the size distribution of smaller γ′ precipitates, and the specific surface of large inhomogeneities as well as some other parameters were determined from the two-dimensional scattering curves measured for as-cast and heat-treated samples. Overlap of the incipient melting region with the region where a certain amount of precipitates remained undissolved was observed, thus complicating a determination of the temperature at which all γ′ precipitates are already dissolved. Nevertheless, conclusions about the temperature at which the precipitates dissolve and about the temperature at which the incipient melting starts could be formulated. The total scattering probability is suggested as the measure of the overall homogeneity of the distribution of elements in the sample. The temperature dependence of this parameter indicates the optimum solution procedure.

Dynamics of CrystallineN-Methylacetamide:  Temperature Dependence of Infrared and Inelastic Neutron Scattering Spectra

1998 ◽  
Vol 102 (32) ◽  
pp. 6177-6183 ◽  
Author(s):  
Mariette Barthes ◽  
Heloisa N. Bordallo ◽  
Juergen Eckert ◽  
Olivier Maurus ◽  
Giorgio de Nunzio ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Temperature Dependence ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering Spectra
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