Paraelectric-Ferroelectric Phase Transition of (NH4)2SO4 Single Crystals by 14N NMR
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The 14N NMR spectra for (NH4)2SO4 crystals were obtained near the phase transition temperature TC=223 K, and were found to precisely reflect the symmetry change in the crystal at this first-order phase transition. Changes in the resonance frequencies near TC were attributed to the structural phase transition. In the ferroelectric and paraelectric phases, two inequivalent NH4 groups were distinguished in the 14N NMR spectra. The two types, NH4(1) and NH4(2), have slightly different local environments. Consequently, we conclude that the phase transition is caused by the change in the environment of the 14N nuclei in the NH4 groups, rather than by the SO4 groups.
Abstract
The 14N NMR spectra for (NH4)2SO4 crystals were obtained near the phase transition temperature TC=223 K, and were found to precisely reflect the symmetry change in the crystal at this first-order phase transition. Changes in the resonance frequencies near TC were attributed to the structural phase transition. In the ferroelectric and paraelectric phases, two inequivalent NH4 groups were distinguished in the 14N NMR spectra. The two types, NH4(1) and NH4(2), have slightly different local environments. Consequently, we conclude that the phase transition is caused by the change in the environment of the 14N nuclei in the NH4 groups, rather than by the SO4 groups.
참고문헌 (24)
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