The electron distribution in superconducting alloys: I. Analysis of V3Si at room temperature

Net atomic charges and molecular dipole moments from spherical-atom X-ray refinements, and the relation between atomic charge and shape

“…The curve of the integrated charge as a function of the radius ratio will have an approximately horizontal part when the boundary between the two volumes is in a region of low electron density and such a position may be defined as the boundary of optimum separation. The results, from Staudenmann, Coppens & Muller (1975), show the curve to be steep near atomic neutrality but much flatter in the region which corresponds to a charge transfer of 1.5-2.5 e from one Si to three V atoms (Fig. 2).…”

“…2. Valence-electron population as a function of radius ratio defining the dimensions of the atomic polyhedra in the alloy V3Si (from Staudenmann, Coppens & Muller, 1975).…”

Hydrogen bond studies. CXXII. A neutron diffraction and X–N deformation-electron-density study of dimethylammonium hydrogen oxalate, (CH3)2NH2HC2O4, at 298 K

“…Regions of lone-pair difference density in the general direction of strong and intermediate strength hydrogen-bond acceptance appear consistently weaker than regions in directions of non-bonding or of weak hydrogen-bond acceptance (Table 6). No integration of the deformation density [of the type made by Staudenmann, Coppens & Muller (1976) for V3Si] has been attempted; the present aim is merely to draw attention to evidence of a general trend. Indeed, similar evidence was obtained for a-glycine (Alml6f, Kvick & Thomas, 1973), where differences were also observed in the strengths of lone-pair orbital peaks for the terminal oxygen O(1) (Fig.…”

The charge-density study of the Laves phases, MgZn2 and MgCu2

“…Merisalo & Soininen (1979)investigated the bonding electrons in fl-Sn with the measurement of the almostforbidden structure factor of 202 from a flat crystal. The intermetallic compounds V3Si and Cr3Si were studied by Staudenmann, Coppens & Muller (1976) and Staudenmann (1977Staudenmann ( , 1978. They compared the electron density at room temperature with that in the superconducting state.…”