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Equal compressibility structural phase transition of molybdenum at high pressure |
| Lun Xiong(熊伦)1,†, Bin Li(李斌)1,2, Fang Miao(苗芳)1, Qiang Li (李强)1, Guangping Chen(陈光平)1,2, Jinxia Zhu(竹锦霞)1, Yingchun Ding(丁迎春)3, and Duanwei He(贺端威)4,5,‡ |
1 School of Intelligent Manufacturing, Sichuan University of Arts and Science, Dazhou 635000, China;
2 DaZhou Industrial Technology Institute of Intelligent Manufacturing, Dazhou 635000, China;
3 College of Optoelectronics Engineering, Chengdu University of Information Technology, Chengdu 610225, China;
4 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
5 Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China |
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Abstract We have studied the high-pressure compression behavior of molybdenum up to 60 GPa by synchrotron radial x-ray diffraction (RXRD) in a diamond anvil cell (DAC). It is found that all diffraction peaks of molybdenum undergo a split at around 27 GPa, and we believe that a phase transition from a body-centered cubic structure to a rhombohedral structure at room pressure has occurred. The slope of pressure-volume curve shows continuity before and after this phase transition, when fitting the pressure-volume curves of the body-centered cubic structure at low pressure and the rhombohedral structure at high pressure. A bulk modulus of 261.3 (2.7) GPa and a first-order derivative of the bulk modulus of 4.15 (0.14) are obtained by using the nonhydrostatic compression data at the angle ψ = 54.7° between the diffracting plane normal and stress axis.
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Received: 11 February 2022
Revised: 02 April 2022
Accepted manuscript online: 14 April 2022
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PACS:
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61.05.cp
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(X-ray diffraction)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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64.30.Ef
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(Equations of state of pure metals and alloys)
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64.70.kd
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(Metals and alloys)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12075163), the Open fund project of Industrial Technology Institute of Sichuan University of Arts and Science, China (Grant No. ZNZZ2101) and the Project of Ph. D special research of Sichuan University of Arts and Science, China (Grant No. 2019BS006Z). The synchrotron radiation RXRD experiments in this work were performed at 4W2 beamline of Beijing Synchrotron Radiation Facility (BSRF), which is supported by the Chinese Academy of Sciences (Grant Nos. KJCX2-SW-N03 and KJCX2-SW-N20). |
Corresponding Authors:
Lun Xiong, Duanwei He
E-mail: 1094129778@qq.com;duanweihe@scu.edu.cn
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Cite this article:
Lun Xiong(熊伦), Bin Li(李斌), Fang Miao(苗芳), Qiang Li (李强), Guangping Chen(陈光平), Jinxia Zhu(竹锦霞), Yingchun Ding(丁迎春), and Duanwei He(贺端威) Equal compressibility structural phase transition of molybdenum at high pressure 2022 Chin. Phys. B 31 116102
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