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35Cl NQR study of the low temperature transition in ferroelectric (CH3NH3)HgCl3
Affiliation:1. School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China;2. Binzhou Institute of Technology, Weiqiao-UCAS Science and Technology Park, Binzhou 256606, China;1. Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang 438000, PR China;2. School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng 224007, PR China;3. State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China;4. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210023, PR China;5. Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan 430205, PR China
Abstract:In addition to the paraelectric-ferroelectric phase transition at Tc = + 62°C there is another low T phase transition in the −152 to −165°C range associated with a sudden change in the NQR spectra.The three 35Cl NQR lines observed in the P32 ferroelectric phase of (CH3NH3)HgCl3 below Tc = 62°C suddenly disappear on cooling below −152°C. No lines could be observed between 152 and −165°C. Below this temperature five 35Cl NQR lines appear and remain down to liquid nitrogen temperature.
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