TiGePt--a study of Friedel differences.
The X-ray single-crystal diffraction intensities of the intermetallic compound TiGePt were analysed. These showed beyond doubt that the crystal structure is non-centrosymmetric. The analysis revolves around the resonant-scattering contribution to differences in intensity between Friedel opposites hkl and \bar h\bar k\bar l. The following techniques were used: R(merge) factors on the average (A) and difference (D) of Friedel opposites; statistical estimates of the resonant-scattering contribution to Friedel opposites; plots of 2A(obs) against 2A(model) and of D(obs) against D(model); the antisymmetric D-Patterson function. Moreover it was possible to show that a non-standard atomic model was unnecessary to describe TiGePt. Two data sets are compared. That measured with Ag Kα radiation at 295 K to a resolution of 1.25 Å(-1) is less conclusive than the one measured with Mo Kα radiation at 100 K to the lower resolution of 0.93 Å(-1). This result is probably due to the fact that the resonant scattering of Pt is larger for Mo Kα than for AgKα radiation.
Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, D-01187 Dresden, Germany.
Sarah Virginia
SV
Ackerbauer
Horst
H
Borrmann
Hans Beat
HB
Bürgi
Howard D
HD
Flack
Yuri
Y
Grin
Anthony
A
Linden
Lukáš
L
Palatinus
W Bernd
WB
Schweizer
Rangana
R
Warshamanage
Michael
M
Wörle
D018360:Crystallography, X-Ray; D005857:Germanium / Q000737:chemistry*; D008958:Models, Molecular; D010984:Platinum / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D005857:Germanium; D010984:Platinum; D014025:Titanium
D-Patterson; Friedel differences; intermetallic compound