Direct determination of self-consistent total energies and charge densities of solids: A study of the cohesive properties of the alkali halides

1992 ◽  
Vol 46 (4) ◽  
pp. 2008-2014 ◽  
Author(s):  
Pietro Cortona
Keyword(s):  
Direct Determination ◽  
Alkali Halides ◽  
Charge Densities ◽  
Cohesive Properties ◽  
Self Consistent ◽  
Total Energies

Direct determination of site symmetry forF A centres in alkali halides

1995 ◽  
Vol 17 (4) ◽  
pp. 411-424 ◽  
Author(s):  
G. Baldacchini ◽  
S. Boiko ◽  
U. Grassano ◽  
F. De Matteis ◽  
A. Scacco ◽  
...  
Keyword(s):  
Direct Determination ◽  
Alkali Halides ◽  
Site Symmetry

Elastic constants of parahydrogen determined by Brillouin scattering

1978 ◽  
Vol 56 (11) ◽  
pp. 1494-1501 ◽  
Author(s):  
P. J. Thomas ◽  
S. C. Rand ◽  
B. P. Stoicheff
Keyword(s):  
Elastic Constants ◽  
Elastic Anisotropy ◽  
Brillouin Scattering ◽  
Direct Determination ◽  
Experimental Measurements ◽  
Frequency Shifts ◽  
Self Consistent ◽  
Good Agreement ◽  
Phonon Calculation

Five single crystals of parahydrogen were grown near the triple point, and their Brillouin spectra examined in known crystal directions. An analysis of the measured frequency shifts of longitudinal and transverse components led to the direct determination of the adiabatic elastic constants at 13.2 K: C11 = 3.34 ± 0.05, C13 = 0.56 ± 0.03, C33 = 4.08 ± 0.06, C44 = 1.04 ± 0.03 kbar. The fifth elastic constant C12 = 1.30 ± 0.05 kbar was evaluated from the relation C11 + C12 = C13 + C33. Values of the following constants were calculated: elastic anisotropy, A = 1.02 ± 0.06, adiabatic bulk modulus, Bs = 1.73 ± 0.04 kbar, and Debye temperature, θD = 111.2 K. All of these values were compared with earlier experimental measurements. The elastic constants were found to be in good agreement with a recent self-consistent phonon calculation by Goldman.

The Direct Determination of I131 in Heterogeneous Fecal Specimens

1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  
Direct Determination

A New Method for Direct Determination of the Recoilless Fraction with Application to Magnetic Nanoparticles

2002 ◽  
Vol 721 ◽  
Author(s):  
Monica Sorescu
Keyword(s):  
Room Temperature ◽  
Average Particle Size ◽  
Direct Determination ◽  
Average Particle ◽  
Lattice Method ◽  
Recoilless Fraction ◽  
Single Room ◽  
Magnetite Particles ◽  
Physical Mixtures

AbstractWe propose a two-lattice method for direct determination of the recoilless fraction using a single room-temperature transmission Mössbauer measurement. The method is first demonstrated for the case of iron and metallic glass two-foil system and is next generalized for the case of physical mixtures of two powders. We further apply this method to determine the recoilless fraction of hematite and magnetite particles. Finally, we provide direct measurement of the recoilless fraction in nanohematite and nanomagnetite with an average particle size of 19 nm.

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