中国物理B ›› 2022, Vol. 31 ›› Issue (3): 36802-036802.doi: 10.1088/1674-1056/ac140c

• • 上一篇    下一篇

High-energy x-ray diffraction study on phase transition asymmetry of plastic crystal neopentylglycol

Zhe Zhang(张哲)1,2,†, Yan-Na Chen(陈艳娜)3,†, Ji Qi(齐迹)1,2, Zhao Zhang(张召)1,2, Koji Ohara4, Osami Sakata3,4, Zhi-Dong Zhang(张志东)1,2,‡, and Bing Li(李昺)1,2,§   

  1. 1 Shenyang National Laboratory(SYNL) for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    3 Synchrotron X-ray Group, Research Center for Advanced Measurement and Characterization, National Institute for Materials Science(NIMS), Sayo, Japan;
    4 SPring-8, Diffraction and Scattering Division, Center for Synchrotron Radiation Research Institute, Japan Synchrotron Radiation Research Institute, Sayo, Japan
  • 收稿日期:2021-05-08 修回日期:2021-07-01 接受日期:2021-07-14 出版日期:2022-02-22 发布日期:2022-02-24
  • 通讯作者: Zhi-Dong Zhang, Bing Li E-mail:zdzhang@imr.ac.cn;bingli@imr.ac.cn
  • 基金资助:
    Project supported by the Key Research Program of Frontier Sciences, the Chinese Academy of Sciences (Grant No. ZDBS-LY-JSC002), the International Partner Program of the Chinese Academy of Sciences (Grant No. 174321KYSB20200008), and the National Natural Science Foundation of China (Grant Nos. 11934007 and 11804346).

High-energy x-ray diffraction study on phase transition asymmetry of plastic crystal neopentylglycol

Zhe Zhang(张哲)1,2,†, Yan-Na Chen(陈艳娜)3,†, Ji Qi(齐迹)1,2, Zhao Zhang(张召)1,2, Koji Ohara4, Osami Sakata3,4, Zhi-Dong Zhang(张志东)1,2,‡, and Bing Li(李昺)1,2,§   

  1. 1 Shenyang National Laboratory(SYNL) for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    3 Synchrotron X-ray Group, Research Center for Advanced Measurement and Characterization, National Institute for Materials Science(NIMS), Sayo, Japan;
    4 SPring-8, Diffraction and Scattering Division, Center for Synchrotron Radiation Research Institute, Japan Synchrotron Radiation Research Institute, Sayo, Japan
  • Received:2021-05-08 Revised:2021-07-01 Accepted:2021-07-14 Online:2022-02-22 Published:2022-02-24
  • Contact: Zhi-Dong Zhang, Bing Li E-mail:zdzhang@imr.ac.cn;bingli@imr.ac.cn
  • Supported by:
    Project supported by the Key Research Program of Frontier Sciences, the Chinese Academy of Sciences (Grant No. ZDBS-LY-JSC002), the International Partner Program of the Chinese Academy of Sciences (Grant No. 174321KYSB20200008), and the National Natural Science Foundation of China (Grant Nos. 11934007 and 11804346).

摘要: As a prototype material of colossal barocaloric effects, neopentylglycol is investigated by combining high-precision differential scanning calorimetric measurement and high-energy x-ray diffraction measurement. The diffraction data at constant temperatures indicate a first-order phase transition with thermal hysteresis as well as the phase transition asymmetry, specifically, the phase transition is completed faster at cooling than at heating. The analysis of resulting pair distribution function confirms the intermolecular disorder in the high-temperature phase. The phase transition asymmetry is quantitatively characterized by time-resolved x-ray diffraction, which is in agreement with the thermal measurement. Also, such an asymmetry is observed to be suppressed at high pressures.

关键词: colossal barocaloric effect, plastic crystals, phase transition asymmetry

Abstract: As a prototype material of colossal barocaloric effects, neopentylglycol is investigated by combining high-precision differential scanning calorimetric measurement and high-energy x-ray diffraction measurement. The diffraction data at constant temperatures indicate a first-order phase transition with thermal hysteresis as well as the phase transition asymmetry, specifically, the phase transition is completed faster at cooling than at heating. The analysis of resulting pair distribution function confirms the intermolecular disorder in the high-temperature phase. The phase transition asymmetry is quantitatively characterized by time-resolved x-ray diffraction, which is in agreement with the thermal measurement. Also, such an asymmetry is observed to be suppressed at high pressures.

Key words: colossal barocaloric effect, plastic crystals, phase transition asymmetry

中图分类号:  (Phase transitions and critical phenomena)

  • 68.35.Rh
61.05.cp (X-ray diffraction) 71.55.Jv (Disordered structures; amorphous and glassy solids)