| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Phase Transition Behavior of LiCr 0.35 Mn0.65O2 under High Pressure by Electrical Conductivity Measurement |
| CUI Xiao-Yan1,2, HU Ting-Jing1, HAN Yong-Hao1, GAO Chun-Xiao1, PENG Gang1, LIU Cai-Long1, WU Bao-Jia1, WANG Yue1, LIU Bao1, REN Wan-Bin1, LI Yan1, SU Ning-Ning1, ZOU Guang-Tian1, DU Fei3, CHEN Gang3 |
| 1State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012 2College of Physics, Jilin Normal University, Siping 136000 3College of Physics, Jilin University, Changchun 130012 |
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| Cite this article: |
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CUI Xiao-Yan, HU Ting-Jing, HAN Yong-Hao et al 2010 Chin. Phys. Lett. 27 036402 |
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Abstract The electrical conductivity of powdered LiCr 0.35 Mn0.65O2 is measured under high pressure up to 26.22 GPa in the temperature range 300-413 K by using a diamond anvil cell. It is found that both conductivity and activation enthalpy change discontinuously at 5.36 GPa and 21.66 GPa. In the pressure range 1.10-5.36 GPa, pressure increases the activation enthalpy and reduces the carrier scattering, which finally leads to the conductivity increase. In the pressure ranges 6.32-21.66 GPa and 22.60-26.22 GPa, the activation enthalpy decreases with pressure increasing, which has a positive contribution to electrical conductivity increase. Two pressure-induced structural phase transitions are found by in-situ x-ray diffraction under high pressure, which results in the discontinuous changes of conductivity and activation enthalpy.
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| Keywords:
64.60.-i
72.20.-i
07.35.+k
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Received: 02 November 2009
Published: 09 March 2010
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| PACS: |
64.60.-i
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(General studies of phase transitions)
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72.20.-i
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(Conductivity phenomena in semiconductors and insulators)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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