Determination of resistivity of solids in powdered form

Changes in the electrical resistance of some powdered substances during compaction have been studied. Two limiting states were introduced for the description of the powder-column resistance: in the first state it equals the resistivity of the solid phase; in the second its resistance equals zero. Co...

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Bibliographic Details
Published in:Powder technology 1994-09, Vol.80 (3), p.183-190
Main Authors: Medek, Jiří, Weishauptová, Zuzana
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Electrical resistance
Exact sciences and technology
General and physical chemistry
Particulate system
Powders
Resistivity
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Summary:Changes in the electrical resistance of some powdered substances during compaction have been studied. Two limiting states were introduced for the description of the powder-column resistance: in the first state it equals the resistivity of the solid phase; in the second its resistance equals zero. Contacts between particles forming the conducting cross-section were expressed as a function of the powder column height. Two mechanisms for the change of the column height were proposed: (a) shifting of particles; (b) particle deformation. The dependence of the resistance on the height of the powder column and on its conducting cross-section was mathematically described. The validity of the equations was experimentally verified using carbonaceous substances with different conductivities. Special enamel was used as an insulating liner, which enabled measurements to be made at pressures of up to 1500 MPa.
ISSN:0032-5910
1873-328X
DOI:10.1016/0032-5910(94)02856-7