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Phase transition and ferroelastic property studied by using the Cs nuclear magnetic resonance in a CsHSO4 single crystal |
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| Authors: | Ae Ran Lim Jin Hae Chang Hyun Min Park |
| Institution: | a Department of Physics, Jeonju University, Jeonju 560-759, South Korea b Department of Polymer Science and Engineering, Kum-Oh National Institute of Technology, Kumi 730-701, South Korea c Electron Microscopy Team, Analysis and Measurements Division, Korea Basic Science Institute, Taejeon 305-333, South Korea d Crystallography Group, Korea Research Institute of Standards and Science, Taejeon 305-600, South Korea |
| Abstract: | The 133Cs spin-lattice relaxation time in a CsHSO4 single crystal was measured in the temperature range from 300 to 450 K. The changes in the 133Cs spin-lattice relaxation rate near Tc1 (=333 K) and Tc2 (=415 K) correspond to phase transitions in the crystal. The small change in the spin-lattice relaxation time across the phase transition from II to III is due to the fact that during the phase transition, the crystal lattice does not change very much; thus, this transition is a second-order phase transition. The abrupt change of T1 around Tc2 (II-I phase transition) is due to a structural phase transition from the monoclinic to the tetragonal phase; this transition is a first-order transition. The temperature dependences of the relaxation rates in phases I, II, and III are indicative of a single-phonon process and can be represented by T1−1=A+BT. In addition, from the stress-strain hysteresis loop and the 133Cs nuclear magnetic resonance, we know that the CsHSO4 crystal has ferroelastic characteristics in phases II and III. |
| Keywords: | 76 60k 77 80Bb 77 80Dj |
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