Author:
Hedden Morgan,Francis Nick,Haraldsen Jason T,Ahmed Towfiq,Constantin Costel
Abstract
Abstract
Particle sizes of manganese oxide (β-MnO2) powders were modified by using a mortar and pestle ground method for period of times that varied between 15–60 min. Particle size versus ground time clearly shows the existence of a size-induced regime transition (i.e., regime I and II). Thermoelectric properties of β-MnO2 powders as a function of electrical resistance in the range of R
P
= 10 - 80Ω were measured. Based on the data presented, we propose a model for the β-MnO2 system in which nanometer-scale MnO2 crystallites bond together through weak van der Waals forces to form larger conglomerates that span in size from nanometer to micrometer scale.
Funder
4-VA Collaborative at James Madison University.
Los Alamos National Laboratory
Publisher
Springer Science and Business Media LLC
Subject
Condensed Matter Physics,General Materials Science
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