𝔖 Bobbio Scriptorium
✦   LIBER   ✦

27Al NMR Study in ZrNiAl

✍ Scribed by Bogdan Nowak; Shigenobu Hayashi

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
221 KB
Volume
18
Category
Article
ISSN
0926-2040

No coin nor oath required. For personal study only.

✦ Synopsis

We have studied the microscopic properties of the hexagonal ZrNiAl, a model compound for a wide family of intermetallic compounds crystallizing in this type of structure, by using 27 Al NMR spectroscopy. We have investigated the lineshape of static and MAS NMR spectra as a function of magnetic field strength (4.7-9.4 T) and temperature (5-300 K). Our data indicate that the 27 Al NMR spectra result from a combined effect of quadrupole and anisotropic shift interactions. The 27 Al nuclei are in an environment characterized by the quadrupole coupling constant e 2 qQ/h of 3.3 MHz, asymmetry parameter η Q of 0.42, isotropic shift δ iso of 393 ppm, shift anisotropy δ anis = δ zz -(δ xx + δ yy )/2 of 150 ppm, and asymmetry factor η S of 0.5. They are found to be temperature independent. The spin-lattice relaxation rate measured at 7.05 T is proportional to the temperature with T 1 T = 135 s K. The mechanisms responsible for observed values of δ iso δ anis T 1 T , and the enhanced Korringa constant are discussed.

📜 SIMILAR VOLUMES

27Al NMR Study in UNiAl
27Al NMR Study in UNiAl
✍ Bogdan Nowak; Robert Troć 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 121 KB

The ternary compound UNiAl exhibiting an antiferromagnetic order below T N = 19 3 K has been studied in the paramagnetic state using the 27 Al NMR technique and different magnetically oriented samples. The quadrupole coupling constant e 2 qQ/h = 1 56 MHz is temperature independent. The dominant, lon

27Al quadrupole nutation NMR studies of
27Al quadrupole nutation NMR studies of amorphous aluminosilicates
✍ Halimaton Hamdan; Jacek Klinowski 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 405 KB

Al quadrupole nutation NMR provides valuable information on the structure of amorphous aluminosilicates derived from zeolite Y by chemical treatment. The local Al environment, ofwhich several kinds can be resolved in the two spectral dimensions, depends vitally on the mode of preparation of the samp

The aluminum ordering in aluminosilicate
The aluminum ordering in aluminosilicates: a dipolar 27Al NMR spectroscopy study
✍ Becky A. Gee 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 191 KB

## Abstract The spatial ordering of aluminum atoms in CsAl(SiO~3~)~2~ and 3Al~2~O~3~·2SiO~2~ was probed by ^27^Al dipolar solid‐state NMR spectroscopy. The ^27^Al response to a Hahn spin‐echo pulse sequence in a series of aluminum‐containing model crystalline compounds demonstrates that quantitativ