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http://hdl.handle.net/2289/7206Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Ramesh, K. P. | - |
| dc.contributor.author | Devaraj, N. | - |
| dc.contributor.author | Vijayaraghavan, D. | - |
| dc.contributor.author | Ramakrishna, J. | - |
| dc.date.accessioned | 2019-05-28T17:36:13Z | - |
| dc.date.available | 2019-05-28T17:36:13Z | - |
| dc.date.issued | 1992 | - |
| dc.identifier.citation | Phase Transitions, 1992, Vol.37, p203-210 | en_US |
| dc.identifier.issn | 0141-1594 | - |
| dc.identifier.issn | 1029-0338(Online) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/7206 | - |
| dc.description | Restricted Access. | en_US |
| dc.description.abstract | The proton second moment (M 2) and spin-lattice relaxation time (T 1) have been measured in (NH4)2ZnBr4 in the range 77–300 K. The room-temperature spectrum shows a structure which disappears around 243 K. The signal is strong and narrow even at 77 K. Proton T 1 shows a maximum at 263 K, caused by spin rotation interaction and decreases with decreasing temperature till 235 K, where it shows a sudden increase. Below 235 K, again it decreases and shows a slope change around 216.5 K (reported Tc ). From 216.5 K, T 1 decreases continuously without exhibiting any minimum down to 77 K. The narrow line at 77 K, and absence of a T 1 minimum down to 77 K indicate the possibility of quantum mechanical tunnelling in this system. Motional parameters such as activation energy and pre-exponential factor have been evaluated for the reorientational motion of the NH+ 4 ion. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Taylor and Francis | en_US |
| dc.relation.uri | https://doi.org/10.1080/01411599208222898 | en_US |
| dc.rights | 1992 Taylor and Francis | en_US |
| dc.subject | second moment | en_US |
| dc.subject | spin-lattice relaxation time | en_US |
| dc.subject | activation energy | en_US |
| dc.subject | spin-rotation interaction | en_US |
| dc.subject | phase transition | en_US |
| dc.subject | reorientation | en_US |
| dc.title | 1H NMR study of molecular dynamics and phase transition in (NH4)2ZnBr4 | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (SCM) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 1992phasetransi(1).pdf Restricted Access | Restricted Access. | 320.46 kB | Adobe PDF | View/Open Request a copy |
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