TY - JOUR
T1 - Electrical conductivity measurements of periclase under high pressure and high temperature
AU - Wu, Xiaoping
AU - Zhang, Baohua
AU - Xu, Junshan
AU - Katsura, Tomoo
AU - Zhai, Shuangmeng
AU - Yoshino, Takashi
AU - Manthilake, Geeth
AU - Shatskiy, Anton
N1 - Funding Information:
This work was supported by funds from the Natural Science Foundation of China (no. 40874034, 40537033), and partially supported by funds of the graduate innovation of USTC (no. KD2007059). We gratefully acknowledge financial support from COE-21 Collaborative Research Program at ISEI, Misasa, Japan. Special thanks are due to anonymous reviewers for their constructive comments.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - The electrical conductivity of sintered polycrystalline periclase has been measured at 20 GPa and temperatures up to 1700 K with a KAWAI-type multi-anvil apparatus. Arrhenius plot of the electrical conductivity shows two linear regions, implying a change of charge transport mechanism with temperature in this experiment. At temperatures below 700 K small polaron conduction dominates, with an activation energy of 0.2 eV. At higher temperatures, the activation energy is determined to be 1.18 eV, which is much higher than 0.2 eV at low temperature. Our observations suggest the high-temperature conduction is attributed to a large polaron process with magnesium vacancy trapping hole on oxygen.
AB - The electrical conductivity of sintered polycrystalline periclase has been measured at 20 GPa and temperatures up to 1700 K with a KAWAI-type multi-anvil apparatus. Arrhenius plot of the electrical conductivity shows two linear regions, implying a change of charge transport mechanism with temperature in this experiment. At temperatures below 700 K small polaron conduction dominates, with an activation energy of 0.2 eV. At higher temperatures, the activation energy is determined to be 1.18 eV, which is much higher than 0.2 eV at low temperature. Our observations suggest the high-temperature conduction is attributed to a large polaron process with magnesium vacancy trapping hole on oxygen.
KW - Electrical conductivity
KW - Ionic conduction
KW - Large polaron
KW - Periclase
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U2 - 10.1016/j.physb.2009.08.036
DO - 10.1016/j.physb.2009.08.036
M3 - Article
AN - SCOPUS:71549139398
VL - 405
SP - 53
EP - 56
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - 1
ER -