Handly, N. H. and Acrivos, J. V. (1984) NMR measurements on intercalated 3R-TaS2.Ix (I=NH3 and N2H4). Journal of Physics C: Solid State Physics, 17 (9). L275-L280. ISSN 0022-3719 http://resolver.caltech.edu/CaltechAUTHORS:HANjpc84
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Proton nuclear magnetic resonance was used to probe the environment of the intercalant molecule in low dimensional (aeolotropic) solids 3RI-TaS2(NH3)2/3 and 3RII-TaS2(N2H4)4/3, and, specifically to look for phase transitions associated with changes in superlattice geometry. The proton resonance frequency for the intercalated molecules in the temperature interval 200 to 300K indicates that there are different magnetic environments in three temperature domains. (i) There is only one resonance field for molecules in isotropic magnetic environments. (ii) The high- and low-temperature domains (I and III) have molecules in only two different environments, whereas in the middle temperature domain (II) there are at least four different magnetic environments. (iii) The different magnetic environments measured by the ratio of anisotropic to isotropic resonance absorption intensity (rai) indicate that the ratios rai are constants of the sample in domains I and II. (iv) At low temperatures (domain III), rai depends on magnetic field polarisation effects and the temperature treatment of the sample. The authors conclude that the different magnetic environments observed for ammonia and hydrazine appear to be determined by the host, octahedrally coordinate TaS2.
|Additional Information:||© 1984 IOP Publishing Limited Received 22 December 1983. Print publication: Issue 9 (30 March 1984) This work was supported in part by NSF DMR 790011 and NATO Grant 1441. JV Acrivos is grateful for a Visiting Fellowship at Trinity College, Cambridge during 1983 and a Sabbatical leave from SJSU. We also thank Miss J Rowe who did the word processing at Trinity College. This work is dedicated to Professor R W Vaughan of Caltech, whose untimely death (1978) left a void that has not to this day been filled. The NMR work was done in his laboratory.|
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