Abstract
A technique for studying of electrical characteristics based on electrochemical impedance spectroscopy of sealed nanopowder compact sets from a powder based on ZrO2 was proposed. The possibility of using this technique for studying of influence of pulsed magnetic field on a charge state of the surface of zirconia nanoparticles is shown. It is established that the action of a weak pulsed magnetic field leads to redistribution of free charge carriers between the volume and the surface of nanoparticles. In particular, different processing times lead to different impedance behaviour: treatment of a pulsed magnetic field with a pulse repetition frequency f = 1 Hz and an exposure time t <15 min leads to an irreversible decrease in the conductivity of the nanoparticle surface by two times (from 3.47 • 10-5 to 1.72 • 10-5 Ohm-1 • m-1), and processing with exposure time 15 <t <90 min leads to its increase by 10 times. Thus, the treatment of PMF causes formation in the near-surface zone of nanoparticles of a region depleted of charge carriers.
Highlights
At the present stage of scientific and technological development the methods of electrochemical impedance spectroscopy (EIS), based on the analysis of a response of the system under study to disturbing effects are becoming increasingly important in fundamental and applied physical research
Taking into account the proximity to aggregate state of phases of nanopowder compacts and dispersed nanopowders, there is reason to believe that compacts as EIS objects can be used to characterize the electrical and physical properties of nanopowders from which they consist [9, 10]
Despite a large number of authentically established macroscopic effects, it is practically impossible to directly detect changes of physical properties of nanoparticles caused by pulsed magnetic field (PMF), even by means of a modern methodological base
Summary
At the present stage of scientific and technological development the methods of electrochemical impedance spectroscopy (EIS), based on the analysis of a response of the system under study to disturbing effects are becoming increasingly important in fundamental and applied physical research. Obtained experimental data can be used to estimate a wide range of electrophysical / electrochemical processes in condensed media with different aggregate phase states [1,2,3,4,5,6]. Taking into account the proximity to aggregate state of phases of nanopowder compacts and dispersed nanopowders, there is reason to believe that compacts as EIS objects can be used to characterize the electrical and physical properties of nanopowders from which they consist [9, 10]. The development of a technique that makes it possible to study the effect of weak pulsed magnetic fields on electrical properties of nanopowder system was the main goal of this work
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