Autor(en): | Böhmer, Roland Winterlich, M. Titze, A. Hinze, G. |
Titel: | Deuteron NMR investigations of glass and phase transitions in (KI)1-x(ND4I)x mixed crystals |
Sprache (ISO): | en |
Zusammenfassung: | Powdered potassium ammonium iodide mixed crystals with ammonium concentrations of 20% and 70% have been studied using deuteron NMR techniques. For the less doped sample the deuteron line starts to broaden and the spin-lattice relaxation time T1 becomes nonexponential below about 20 K. These observations indicate the breakdown of ergodicity and the onset of orientational glass freezing. At the lowest temperatures T1 reaches a plateau value. For the 70% sample a relatively abrupt onset of two-phase behavior at T<35 K is inferred from measurements of the spin-spin and spin-lattice relaxation times. These observations are taken to indicate an order-disorder transition to a crystalline phase which exhibits dynamically distinguishable lattice sites. |
URI: | http://hdl.handle.net/2003/25567 http://dx.doi.org/10.17877/DE290R-2764 |
Erscheinungsdatum: | 1998 |
Provinienz: | The American Physical Society |
URL: | http://dx.doi.org/10.1103/PhysRevB.57.14158 |
Zitierform: | Winterlich, M.; Titze, A.; Hinze, G.; Böhmer, R.: Deuteron NMR investigations of glass and phase transitions in (KI)1-x(ND4I)x mixed crystals. In: Physical Review B Jg. 57(1998), 14158-14163, 10.1103/PhysRevB.57.14158. |
Enthalten in den Sammlungen: | Böhmer, Roland Prof. Dr. |
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