中国物理B ›› 2022, Vol. 31 ›› Issue (9): 96201-096201.doi: 10.1088/1674-1056/ac6157

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In situ study of calcite-III dimorphism using dynamic diamond anvil cell

Xia Zhao(赵霞)1,2, Sheng-Hua Mei(梅升华)1,†, Zhi Zheng(郑直)1, Yue Gao(高悦)1,2, Jiang-Zhi Chen(陈姜智)1, Yue-Gao Liu(刘月高)1, Jian-Guo Sun(孙建国)3, Yan Li(李艳)1,2, and Jian-Hui Sun(孙建辉)1   

  1. 1 CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences(CAS), Sanya 572000, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Department of Mechanical Engineering, National University of Singapore(NUS), Singapore 117575, Singapore
  • 收稿日期:2021-12-09 修回日期:2022-03-21 接受日期:2022-03-28 出版日期:2022-08-19 发布日期:2022-08-30
  • 通讯作者: Sheng-Hua Mei E-mail:mei@idsse.ac.cn
  • 基金资助:
    Project supported by the Fund from the Chinese Academy of Sciences (Grant No. QYZDY-SSW-DQC029) and the National Natural Science Foundation of China (Grant No. 41674097).

In situ study of calcite-III dimorphism using dynamic diamond anvil cell

Xia Zhao(赵霞)1,2, Sheng-Hua Mei(梅升华)1,†, Zhi Zheng(郑直)1, Yue Gao(高悦)1,2, Jiang-Zhi Chen(陈姜智)1, Yue-Gao Liu(刘月高)1, Jian-Guo Sun(孙建国)3, Yan Li(李艳)1,2, and Jian-Hui Sun(孙建辉)1   

  1. 1 CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences(CAS), Sanya 572000, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Department of Mechanical Engineering, National University of Singapore(NUS), Singapore 117575, Singapore
  • Received:2021-12-09 Revised:2022-03-21 Accepted:2022-03-28 Online:2022-08-19 Published:2022-08-30
  • Contact: Sheng-Hua Mei E-mail:mei@idsse.ac.cn
  • Supported by:
    Project supported by the Fund from the Chinese Academy of Sciences (Grant No. QYZDY-SSW-DQC029) and the National Natural Science Foundation of China (Grant No. 41674097).

摘要: The phase transitions among the high-pressure polymorphic forms of CaCO3 (cc-I, cc-II, cc-III, and cc-IIIb) are investigated by dynamic diamond anvil cell (dDAC) and in situ Raman spectroscopy. Experiments are carried out at room temperature and high pressures up to 12.8 GPa with the pressurizing rate varying from 0.006 GPa/s to 0.056 GPa/s. In situ observation shows that with the increase of pressure, calcite transforms from cc-I to cc-II at ~ 1.5 GPa and from cc-II to cc-III at ~ 2.5 GPa, and transitions are independent of the pressurizing rate. Further, as the pressure continues to increase, the cc-IIIb begins to appear and coexists with cc-III within a pressure range that is inversely proportional to the pressurizing rate. At the pressurizing rates of 0.006, 0.012, 0.021, and 0.056 GPa/s, the coexistence pressure ranges of cc-III and cc-IIIb are 2.8 GPa-9.8 GPa, 3.1 GPa-6.9 GPa, 2.7 GPa-6.0 GPa, and 2.8 GPa-4.5 GPa, respectively. The dependence of the coexistence on the pressurizing rate may result from the influence of pressurizing rate on the activation process of transition by reducing the energy barrier. The higher the pressurizing rate, the lower the energy barrier is, and the easier it is to pull the system out of the coexistence state. The results of this in situ study provide new insights into the understanding of the phase transition of calcite.

关键词: calcite-III, dimorphism, dynamic diamond anvil cell, in situ Raman spectroscopy, pressurizing rate

Abstract: The phase transitions among the high-pressure polymorphic forms of CaCO3 (cc-I, cc-II, cc-III, and cc-IIIb) are investigated by dynamic diamond anvil cell (dDAC) and in situ Raman spectroscopy. Experiments are carried out at room temperature and high pressures up to 12.8 GPa with the pressurizing rate varying from 0.006 GPa/s to 0.056 GPa/s. In situ observation shows that with the increase of pressure, calcite transforms from cc-I to cc-II at ~ 1.5 GPa and from cc-II to cc-III at ~ 2.5 GPa, and transitions are independent of the pressurizing rate. Further, as the pressure continues to increase, the cc-IIIb begins to appear and coexists with cc-III within a pressure range that is inversely proportional to the pressurizing rate. At the pressurizing rates of 0.006, 0.012, 0.021, and 0.056 GPa/s, the coexistence pressure ranges of cc-III and cc-IIIb are 2.8 GPa-9.8 GPa, 3.1 GPa-6.9 GPa, 2.7 GPa-6.0 GPa, and 2.8 GPa-4.5 GPa, respectively. The dependence of the coexistence on the pressurizing rate may result from the influence of pressurizing rate on the activation process of transition by reducing the energy barrier. The higher the pressurizing rate, the lower the energy barrier is, and the easier it is to pull the system out of the coexistence state. The results of this in situ study provide new insights into the understanding of the phase transition of calcite.

Key words: calcite-III, dimorphism, dynamic diamond anvil cell, in situ Raman spectroscopy, pressurizing rate

中图分类号:  (High-pressure effects in solids and liquids)

  • 62.50.-p
33.20.Fb (Raman and Rayleigh spectra (including optical scattering) ?) 47.80.Fg (Pressure and temperature measurements) 91.65.-n (Mineralogy and petrology)