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14N quadrupole coupling in paraelectric (NH4)2 SO4

✍ Scribed by R. Blinc; M. Mali; R. Osredkar; A. Prelesnik; J. Seliger; I. Zupančič

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
273 KB
Volume
14
Category
Article
ISSN
0009-2614

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✦ Synopsis

The technique of pulsed nitrogen-proton double resonance in the rotating f?ame has been used to determine the electric field gradient (EFG) tensors at the t4N sites in paraelectric (NH&S04.

The results show that the NH:-ions are highly distorted and that there are two chemically nonequivalent sets of 14N sites in the unit cell: (e'qQ/h)r = 117 kHz, 'I~ = 0.64 and (.~'qQ/lh)~~ = equivalent NG-pairs. 91 kHz, TQ, = 0.67. Each of these two sets further contains two physiully non-Oouhle HMR 'H -"N

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