Electrical conductivity measurements of periclase under high pressure and high temperature

Xiaoping Wu; Baohua Zhang; Junshan Xu; Tomoo Katsura; Shuangmeng Zhai; Takashi Yoshino; Geeth Manthilake; Anton Shatskiy

doi:10.1016/j.physb.2009.08.036

Electrical conductivity measurements of periclase under high pressure and high temperature

Xiaoping Wu, Baohua Zhang, Junshan Xu, Tomoo Katsura, Shuangmeng Zhai, Takashi Yoshino, Geeth Manthilake, Anton Shatskiy

Institute for Planetary Materials

Research output: Contribution to journal › Article

10 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	53-56
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	405
Issue number	1
DOIs	https://doi.org/10.1016/j.physb.2009.08.036
Publication status	Published - Jan 1 2010

Keywords

Electrical conductivity
Ionic conduction
Large polaron
Periclase

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Electrical conductivity measurements of periclase under high pressure and high temperature",

abstract = "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.",

keywords = "Electrical conductivity, Ionic conduction, Large polaron, Periclase",

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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

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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