Relaxation of 2 7 AI NMR in Aluminium Tribromide due to Raman Process
نویسندگان
چکیده
The nuclear spin-lattice relaxation of A1 N M R in AlBr 3 has been examined from 25 to 320 K. The result is analyzed using a theory of the R a m a n process based on covalency. A Debye temperature of 118 K is obtained together with a covalency larger than that obtained f rom the relaxation in the 8 1 Br N Q R .
منابع مشابه
HYDRATION BEHAVIOUR AND ANTIOXIDISING EFFECT OF ALUMINIUM POWDER ADDED TO OXIDE- AND CARBON-BASED CASTABLES
Hydration behavior and antioxidising effect of aluminium (AI) powder has been investigated. Bayerite Al (OH) 3 product layers formed on Al in pure water at 25-45°C were porous, so the hydration rate, although very slow at 25°C, increased rapidly with increasing temperature from 25 to 45°C. On further increasing temperature from 45 to 95°C, initial hydration rate increased, but changed little ov...
متن کاملInfrared Studies of Rotational and Vibrational Relaxation in Liquid Cyclohexane
The above relationship implies that vibrational and rotational relaxation are statistically independent. When a Raman investigation of the isotropic scattering of the same band is possible (in the case of vibrations which belong to the totally symmetric species), 0Vib (t) is often taken from the FT of the isotropic Raman scattering and CTOt(t) may be calculated [2]. However, for molecules with ...
متن کاملMultinuclear solid-state NMR studies of Brmsted sites in zeolites
Two NMR techniques, zH MAS NMR and echo Fourier 27AI NMR, have been applied for the first time to the investigation of Bronsted sites in dehydrated hydrogen forms ofzeolites. The “AI signal of SiOHAl sites, which was “NMR-invisible” until now, yields a quadrupole coupling constant C,,= 16 MHz for the dehydrated zeolite H-ZSM-5. The values of C,, determined from the ZH MAS NMR spectra of SiODAl ...
متن کاملNmr Study of the Electronic Structure of Solid and Liquid Metals
NMR was used to study the effect of melting on the electronic structure of copper and aluminium. The Knight shift and spin—lattice relaxation time were measured as a function of temperature in the solid and in the liquid state. From these measurements the temperature dependence of K(x). the reciprocal enhancement factor of the Korringa relation, is obtained. In the case of copper it is shown th...
متن کاملStructure and Li+ dynamics of Sb-doped Li7La3Zr2O12 fast lithium ion conductors.
Antimony-doped lithium stuffed garnets Li(7-x)La3Zr(2-x)Sb(x)O12 (x = 0.2-1.0) prepared using a conventional solid state reaction method are characterized using Powder X-ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), Energy Dispersive Analysis by X-ray (EDAX), AC Impedance spectroscopy, Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) and Raman spectroscopic techniques. PX...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2013