Thermoelectric Properties of Nano-Meso-Micro β-MnO(2) Powders as a Function of Electrical Resistance

Particle sizes of manganese oxide (β-MnO(2)) 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 pr...

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Detalles Bibliográficos
Autores principales: Hedden, Morgan, Francis, Nick, Haraldsen, Jason T, Ahmed, Towfiq, Constantin, Costel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2015
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4501329/
https://www.ncbi.nlm.nih.gov/pubmed/26168867
http://dx.doi.org/10.1186/s11671-015-1000-6
Descripción
Sumario:Particle sizes of manganese oxide (β-MnO(2)) 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-MnO(2) 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-MnO(2) system in which nanometer-scale MnO(2) crystallites bond together through weak van der Waals forces to form larger conglomerates that span in size from nanometer to micrometer scale.

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