Polarised vibrational spectra of betaine ortho-phosphoric acid complex. Part II. Phase transitions studies |
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| Authors: | Ilczyszyn Maria M |
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| Affiliation: | 1. N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991 Moscow, Leninsky Prospect, 31, Russia;2. Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optic Research Center, 119333 Moscow, 38 Vavilov str., Russia;1. Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden;2. Max Lab, Lund University, S-22100 Lund, Sweden;1. State Key Laboratory of Multiphase Flow for Power Engineering, Xi’an Jiaotong University, Xían 710049, China;2. Xían Thermal Power Research Institute Co., Ltd, Xían 710032, China;1. Institute of Material Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany;2. Univ. Grenoble Alpes, CNRS, LMGP, F-38000 Grenoble, France;3. Laboratoire des Multimatériaux et Interfaces, UMR CNRS 5615, Université de Lyon, 69622 Villeurbanne, France |
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| Abstract: | Polarised infrared transmission and Raman spectra of betaine ortho-phosphoric acid crystal in temperature ranges 13-393 and 13-300 K, respectively are reported and discussed in relation to phase transitions: antiferrodistortive at T(c1) = 365 K and antiferroelectric at T(c3) = 81 K. The spectra are consistent with unit cell doubling below T(c3). The participation of all hydrogen bonds apparent in the crystal in the antiferroelectric phase transition was shown. Quite large freedom of -N(CH(3))(3) groups reorientation in the antiferroelectric phase was detected. No changes were found in the transmission spectra taken in the vicinity of the antiferrodistortive phase transition temperature. |
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