| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Pressure-Induced Metallization and Electrical Phase Diagram for Polycrystalline CaB$_{6}$ under High Pressure and Low Temperature |
| Jie Yang1,2, Yang Jiao1, Yong-Hao Han2**, Jing Li3** |
1Fundamental Department, Aviation University of Airforce, Changchun 130022
2State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012
3School of Mechatronic Engineering, Changchun University of Technology, Changchun 130012
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| Cite this article: |
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Jie Yang, Yang Jiao, Yong-Hao Han et al 2016 Chin. Phys. Lett. 33 086201 |
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Abstract The electrical properties of polycrystalline CaB$_{6}$ are revealed by in-situ resistance measurements under high pressure and low temperature. Due to the existence of grain boundaries, polycrystalline CaB$_{6}$ behaves with semiconducting transport properties, which is different from the semimetallic CaB$_{6}$ single crystals. The temperature-dependent resistance measurement results show that before the structural phase transition at 12.3 GPa the high pressure first induces the metallization at 6.5 GPa for CaB$_{6}$. Moreover, the phase diagram for CaB$_{6}$ is drawn based on the investigated electric conducting properties and at least three different conducting phases are found even at moderate high pressure and low temperature, indicating that the electric nature of CaB$_{6}$ is very sensitive to the environment.
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Received: 29 January 2016
Published: 31 August 2016
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| PACS: |
62.50.-p
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(High-pressure effects in solids and liquids)
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74.62.-c
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(Transition temperature variations, phase diagrams)
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64.70.kg
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(Semiconductors)
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