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Absolute Atomic Scattering Factors of Tungsten
Author(s) -
Paakkari T.,
Suortti P.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680280210
Subject(s) - tungsten , scattering , absolute scale , atomic physics , absolute zero , materials science , debye model , atomic number , monochromatic color , intensity (physics) , chemistry , physics , optics , condensed matter physics , thermodynamics , metallurgy
The atomic scattering factors f of tungsten are determined in the region sin θ/λ ≤ 1.1 Å −1 from the integrated intensities of Bragg reflections. The reflections from a powder sample were measured at 300 ° K with monochromatic MoKα radiation. The intensities are corrected for the effects of porosity and surface roughness, and for the contribution of thermal diffuse scattering. The intensities are put on an absolute scale with respect to the absolute value f (110) of iron. The mass absorption coefficient of tungsten for MoKα radiation is measured to be μ Q = (101.8± 0.4) cm 2 /g. A value for the temperature parameter of B W = (0.183±0.008) Å 2 is obtained by a measurement of the integrated intensity of a high‐order reflection both at 300 and 78 ° K. This corresponds to the Debye temperature θ M = (325 ∓ 7) ° K. The experimental f ‐values are compared with various theoretical calculations. It is found out that the Dirac‐Slater values are in excellent agreement with present results.