Premium
Induced Polarization of Rocks Containing Metallic Particles: Evidence of Passivation Effect
Author(s) -
Gurin Grigory,
Titov Konstantin,
Ilyin Yuri
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl080107
Subject(s) - passivation , materials science , metal , polarization (electrochemistry) , induced polarization , particle size , surface charge , nanoparticle , chemical physics , condensed matter physics , composite material , nanotechnology , metallurgy , chemistry , electrical resistivity and conductivity , physics , layer (electronics) , quantum mechanics
We studied the impact of electrical isolation (passivation) of metallic particles on induced polarization (IP) parameters. We carried out laboratory experiments with six synthetic models made of sieved sand mixed with metallic particles. The purpose of this experiment was to understand what mechanism (polarization of positive and negative charge carriers within the particles or interfacial polarization) was responsible for the IP effect. Size and location of passivated zones on the particle surfaces varied from model to model. We observed a decrease of the total chargeability and relaxation time values with the increase of passivated surface. Fully passivated metallic particles showed no IP effect. These data suggest the dominant role of the interface phenomena in IP associated with metallic particles.