Zobrazeno 1 - 10
of 34
pro vyhledávání: '"N. K. Hansen"'
Publikováno v:
The European Physical Journal B. 42:373-380
The effect of a static electric field on the crystal structure of $\alpha $ -quartz has been determined by Xray diffraction on single crystals. By a stroboscopic technique rocking curves are measured quasi simultaneously for zero field and for two op
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 219:558-566
The crystal structures of four compounds X n[Fe(CN)5NO] with the different inorganic and organic cations X n = Pb, (H3O+CH6N+), (C2N2H7)2 and (C16H36N)2 were determined. (H3O+CH6N+)[Fe(CN)5NO] and (C2N2H7)2[Fe(CN)5NO] crystallize in the non-centrosym
Studies of electric field induced structural and electron-density modifications by X-ray diffraction
Publikováno v:
Acta Crystallographica Section A Foundations of Crystallography. 60:465-471
During the last two decades, a number of X-ray diffraction studies on the response of a crystal to an applied electric field have been carried out. In a few cases, the electron-density polarizations could be determined. The analysis of the induced va
Autor:
Pierre Fertey, Gervais Chapuis, N. K. Hansen, Vaclav Petricek, Theo Woike, Claude Lecomte, Michal Dušek, R. Pankrath, Alla Arakcheeva, Mirco Imlau
Publikováno v:
Acta Crystallographica Section B Structural Science. 59:28-35
The structure of a crystal of Sr0.61Ba0.39Nb2O6 has been solved and refined as an incommensurate structure in five-dimensional superspace. The structure is tetragonal, superspace group P4bm(\,pp1/2,p - p1/2), unit-cell parameters a = 12.4566 (9), c =
Publikováno v:
Acta Crystallographica Section B Structural Science. 58:463-470
The experimental crystal charge density of the complex [Cu(iz)2(can)2] (I) (where iz = imidazole, can = cyanamidonitrate anion), [Cu(C3H4N2)2(CN3O2)2], crystallizing in centrosymmetric space group P21/c, has been determined at 120.0 (2) K, using Hans
Publikováno v:
Journal of Applied Crystallography. 35:360-363
Based on the ideas of previous work, a device has been built for applying strong electric fields to a crystal during the measurement of diffracted intensities using a field-switching technique. It consists of a high-voltage supply, the electronics fo
Publikováno v:
Journal of Physics: Condensed Matter. 12:2667-2679
The electron-density distribution in CaNi2 Si2 has been analysed by means of x-ray diffraction measurements and a full-potential augmented-plane-wave band-structure calculation. The agreement between experiment and theory is good, considering the dif
Publikováno v:
Journal of Applied Crystallography. 32:1-10
Single crystals of KTiOPO4(KTP) and NaTiOPO4(NaTP) show pronounced pyroelectric behaviour. In order to determine the origin of this property on an atomic scale, X-ray diffraction measurements have been carried out at several temperatures between 100
Publikováno v:
Acta Crystallographica Section B Structural Science. 53:870-879
The electron density distribution in lithium triborate LiB3O5 has been studied at room temperature by X-ray diffraction using Ag K \alpha radiation up to 1.02 Å−1 [1439 unique reflections with I > 3\sigma(I)]. Conventional refinements with a free-
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 53:1173-1176
The title compounds, sodium titanyl phosphate and potassium titanyl phosphate, are isostructural, belonging to a family of compounds with interesting non-linear optical properties. The effect of substitution of K by Na has been analysed by X-ray diff