| INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Structural stability and vibrational characteristics of CaB6 under high pressure |
| Mingkun Liu(刘明坤), Can Tian(田灿), Xiaoli Huang(黄晓丽), Fangfei Li(李芳菲), Yanping Huang(黄艳萍), Bingbing Liu(刘冰冰), Tian Cui(崔田) |
| State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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Abstract In situ Raman spectroscopy and x-ray diffraction measurements are used to explore the structural stability of CaB6 at high pressures and room temperature. The results show no evidence of structural phase transitions up to at least 40 GPa. The obtained equation of state with smooth pressure dependencies yields a zero-pressure isothermal bulk modulus B0=170 (5) GPa, which agrees well with the previous measurements. The frequency shifts for A1g, Eg, and T2g vibrational modes of polycrystalline CaB6 are obtained with pressure uploading. As the pressure increases, all the vibration modes have smooth monotonic pressure dependence. The Grüneisen parameter of Eg modes is the largest, indicating its largest dependence on the volume of a crystal lattice.
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Received: 07 January 2019
Revised: 04 April 2019
Accepted manuscript online:
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PACS:
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81.05.Je
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(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
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81.05.ug
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(Diamond)
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91.65.Pj
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(Ultra-high pressure metamorphism)
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64.60.-i
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(General studies of phase transitions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51572108, 51632002, 11504127, 11674122, 11574112, 11474127, and 11634004), the 111 Project, China (Grant No. B12011), the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT_15R23), and the National Found for Fostering Talents of Basic Science, China (Grant No. J1103202). |
Corresponding Authors:
Xiaoli Huang
E-mail: huangxiaoli@jlu.edu.cn
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Cite this article:
Mingkun Liu(刘明坤), Can Tian(田灿), Xiaoli Huang(黄晓丽), Fangfei Li(李芳菲), Yanping Huang(黄艳萍), Bingbing Liu(刘冰冰), Tian Cui(崔田) Structural stability and vibrational characteristics of CaB6 under high pressure 2019 Chin. Phys. B 28 068101
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