Abstract
We have investigated the local environments and the lattice dynamics of polycrystalline samples of pure thiourea (SC(NH2)2) and urea (OC(NH2>2)-doped thiourea using the techniques of 1H pulsed NMR. In the NMR frequency range of our investigation the room temperature spin-lattice relaxation rate (1/Ti) varies very sensitively following the form predicted from the theory of the spectral density. This frequency dependence allowed us to calculate the correlation times of molecular reorientation in the pure and urea-doped thiourea lattices. The lineshapes showed the different environments of the protons in the two systems. We have also observed the effect of the 14N quadrupole-1H Zeeman level cross relaxation by directly taking NMR data at the magnetic field of the level crossing in thiourea.
| Original language | English |
|---|---|
| Pages (from-to) | 315-320 |
| Number of pages | 6 |
| Journal | Ferroelectrics |
| Volume | 156 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1994 Jun |
Bibliographical note
Funding Information:This work was supported by the Korea Science and Engineering Foundation through the Science Research Center of Excellence Pmgram (1991 - 1994). We thank Mr. K H, Yoon and Mr. D. K. Oh for their technical assistance.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics