9 research outputs found
Исследование области применения отклонителя ударно-вращательного типа для управления направлением скважин
Charakterisierung katalytisch interessanter Systeme von Übergangsmetallcarbonylen mit Hilfe der MB-FTMW-Spektroskopie
Charakterisierung katalytisch interessanter Systeme von Übergangsmetallcarbonylen mit Hilfe der MB-FTMW-Spektroskopie
Structure of Ammonia Trimethylalane (Me3Al-NH3): Microwave Spectroscopy, X-ray Powder Diffraction, and ab Initio Calculations
MICROWAVE SPECTRA AND MOLECULAR STRUCTURE OF ACETYLENEMETHYLDIOXORHENIUM, A RHENIUM
Supported by THE NATIONAL SCIENCE FOUNDATION.Author Institution: Department of Chemistry, University of Arizona; Jet Propulsion Laboratory, California Institute of Technology; Jet Propulsion Laboratory, Anorganisch-Chemisches Institut der Technischen Universit\""{a}t M\""{u}nchenThe molecular structure for (-acetylene) methyldioxorhenium (ACMDO) was obtained by measuring and analysing the rotational spectra for 14 isotopomers. This appears to be the first gas-phase measurement for a rhenium metalacyclopropene, and the first structural data on this compound. This complex is closely related to reaction intermediates in methyltrioxorhenium (MTO) and catalysed oxidation reactions. These reactions are very important in industrial chemical production and for syntheses of chiral products. Only a few alkyne complexes or transitions metals in high oxidation states are known and even fewer have been structurally characterized. The microwave spectra were measured in the 4-11 GHz range using a Flygare-Balle-type pulsed-beam microwave spectrometer. Rotational constants and rhenium quadrupole coupling tensors were obtained for all isotopomers. The acetylene ligand structure is modified and exhibis partial hybridization. The C-C bond length is increased by 0.08{\AA} to 1.29{\AA}. The H-C-C interbond angles are reduced from to , and . The quadrupole splitting patterns and systematic changes in the quadrupole coupling tensors were very helpful in making positive assignments
Nebulized spray pyrolysis of Al-doped Li7La3Zr2O12 solid electrolyte for battery applications
Nebulized spray pyrolysis followed by consolidation and sintering was used for the first time to prepare Al-doped garnet-based Li7−3xLa3Zr2AlxO12 (x = 0–0.25) (LLZO) ultra-fine grained ceramics. The structural changes from the tetragonal (x = 0), via a mixture of the cubic and the tetragonal (x = 0.07, 0.10) to the cubic modification (x = 0.15–0.25) were observed. 27Al NMR study showed that aluminum occupy the tetrahedral 24d lithium sites. Despite their low relative density (47–56%), preliminary ionic conductivities of the LLZO ceramics, were found to be 1.2 · 10− 6 S cm− 1 and 4.4 · 10− 6 S cm− 1 for tetragonal and cubic LLZO at room temperature, with activation energies of 0.55 eV and 0.49 eV, respectively