中国物理B ›› 2019, Vol. 28 ›› Issue (9): 96401-096401.doi: 10.1088/1674-1056/ab327d

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Crystal melting processes of propylene carbonate and 1,3-propanediol investigated by the reed-vibration mechanical spectroscopy for liquids

Li-Na Wang(王丽娜), Xing-Yu Zhao(赵兴宇), Heng-Wei Zhou(周恒为), Li Zhang(张丽), Yi-Neng Huang(黄以能)   

  1. 1 National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China;
    2 Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining 835000, China
  • 收稿日期:2019-03-06 修回日期:2019-06-25 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: Heng-Wei Zhou, Yi-Neng Huang E-mail:zhw33221@163.com;ynhuang@nju.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11664042).

Crystal melting processes of propylene carbonate and 1,3-propanediol investigated by the reed-vibration mechanical spectroscopy for liquids

Li-Na Wang(王丽娜)1,2, Xing-Yu Zhao(赵兴宇)1,2, Heng-Wei Zhou(周恒为)2, Li Zhang(张丽)1,2, Yi-Neng Huang(黄以能)1,2   

  1. 1 National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China;
    2 Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining 835000, China
  • Received:2019-03-06 Revised:2019-06-25 Online:2019-09-05 Published:2019-09-05
  • Contact: Heng-Wei Zhou, Yi-Neng Huang E-mail:zhw33221@163.com;ynhuang@nju.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11664042).

摘要:

The melting of crystals is one of the most common and general phase transition phenomena. However, the mechanism of crystal melting is not well understood, and more experimental measurements and explorations are still needed. The mechanical spectra of propylene carbonate and 1,3-propanediol during the crystal melting processes are measured by the reed vibration mechanical spectroscopy for liquids (RMS-L) for the first time. The experimental results show that as the temperature increases, the real part of the complex Young modulus first decreases slowly, and then quickly drops to zero; meanwhile, its imaginary part increases slowly at first, then goes up and drops quickly to zero, showing a peak of internal friction. Preliminary analyses indicate that both the real and imaginary parts can present some characteristics of the melting process, such as the transition from the disconnected liquid regions to the connected liquid regions, that from the connected crystal regions to the disconnected crystal regions, and so on. In addition, the results show that the melting rate per unit volume of crystalline phase versus temperature satisfies the Arrhenius relation at the initial stage of melting, and deviates from this relation as the temperature increases to a certain value. Therefore, the RMS-L will provide an effective supplement for the further study of melting.

关键词: crystal melting, mechanical spectroscopy, complex Young modulus, percolation

Abstract:

The melting of crystals is one of the most common and general phase transition phenomena. However, the mechanism of crystal melting is not well understood, and more experimental measurements and explorations are still needed. The mechanical spectra of propylene carbonate and 1,3-propanediol during the crystal melting processes are measured by the reed vibration mechanical spectroscopy for liquids (RMS-L) for the first time. The experimental results show that as the temperature increases, the real part of the complex Young modulus first decreases slowly, and then quickly drops to zero; meanwhile, its imaginary part increases slowly at first, then goes up and drops quickly to zero, showing a peak of internal friction. Preliminary analyses indicate that both the real and imaginary parts can present some characteristics of the melting process, such as the transition from the disconnected liquid regions to the connected liquid regions, that from the connected crystal regions to the disconnected crystal regions, and so on. In addition, the results show that the melting rate per unit volume of crystalline phase versus temperature satisfies the Arrhenius relation at the initial stage of melting, and deviates from this relation as the temperature increases to a certain value. Therefore, the RMS-L will provide an effective supplement for the further study of melting.

Key words: crystal melting, mechanical spectroscopy, complex Young modulus, percolation

中图分类号:  (Melting of specific substances)

  • 64.70.dj
62.90.+k (Other topics in mechanical and acoustical properties of condensed matter) 62.40.+i (Anelasticity, internal friction, stress relaxation, and mechanical resonances) 64.70.-p (Specific phase transitions)