133Cs Nuclear Magnetic Resonance Relaxation Study of the Phase Transition of Cs2MnCl4·2H2O Single Crystals
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The structural phase transition of Cs2MnCl4·2H2O single crystals was investigated by determining the 133Cs spin-lattice relaxation time T1. The number of resonance lines in the 133Cs spectrum changes from seven to one near 375 K, which means that above 375 K the Cs sites are symmetric. Further, the T1 of the 133Cs nucleus undergoes a significant change near 375 K, which coincides with the change in the splitting of the 133Cs resonance lines. The change in T1 near TC is related to the loss of H2O, and means that the forms of the octahedra of water molecules surrounding Cs+ are disrupted.
Abstract
The structural phase transition of Cs2MnCl4·2H2O single crystals was investigated by determining the 133Cs spin-lattice relaxation time T1. The number of resonance lines in the 133Cs spectrum changes from seven to one near 375 K, which means that above 375 K the Cs sites are symmetric. Further, the T1 of the 133Cs nucleus undergoes a significant change near 375 K, which coincides with the change in the splitting of the 133Cs resonance lines. The change in T1 near TC is related to the loss of H2O, and means that the forms of the octahedra of water molecules surrounding Cs+ are disrupted.
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