Experimental Study on the Electrical Conductivity of Pyroxene Andesite at High Temperature and High Pressure

The electrical conductivity of pyroxene andesite was in situ measured under conditions of 1.0–2.0 GPa and 673–1073 K using a YJ-3000t multi-anvil press and Solartron-1260 Impedance/Gain-phase analyzer. Experimental results indicate that the electrical conductivities of pyroxene andesite increase wit...

Full description

Saved in:
Bibliographic Details
Published in:Pure and applied geophysics 2017-03, Vol.174 (3), p.1033-1041
Main Authors: Hui, KeShi, Dai, LiDong, Li, HePing, Hu, HaiYing, Jiang, JianJun, Sun, WenQing, Zhang, Hui
Format: Article
Language:English
Subjects:
Activation
Andesite
Conductivity
Dehydration
Earth and Environmental Science
Earth Sciences
Electrical conductivity
Electrical properties
Electrical resistivity
Electrical studies
Enthalpy
Geophysics/Geodesy
High pressure
High temperature
Igneous rocks
Pressure measurement
Pyroxenes
Temperature effects
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The electrical conductivity of pyroxene andesite was in situ measured under conditions of 1.0–2.0 GPa and 673–1073 K using a YJ-3000t multi-anvil press and Solartron-1260 Impedance/Gain-phase analyzer. Experimental results indicate that the electrical conductivities of pyroxene andesite increase with increasing temperature, and the electrical conductivities decrease with the rise of pressure, and the relationship between electrical conductivity ( σ ) and temperature ( T ) conforms to an Arrhenius relation within a given pressure and temperature range. When temperature rises up to 873–923 K, the electrical conductivities of pyroxene andesite abruptly increase, and the activation enthalpy increases at this range, which demonstrates that pyroxene andesite starts to dehydrate. By the virtue of the activation enthalpy (0.35–0.42 eV) and the activation volume (−6.75 ± 1.67 cm 3 /mole) which characterizes the electrical properties of sample after dehydration, we consider that the conduction mechanism is the small polaron conduction before and after dehydration, and that the rise of carrier concentration is the most important reason of increased electrical conductivity.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-016-1401-1