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Effect of surface moisture on dielectric behavior of ultrafine BaTiO3 particulates.The effects of adsorbed H2O on the dielectric properties of ultrafine BaTiO3 particulates of varying particle size and environmental history were determined. The dielectric behavior depends strongly on surface hydration. No particle size dependence of dielectric constant was found for dehydroxylated surfaces in ultrafine particulate (unsintered) BaTiO3 materials. For equivalent particle sizes, the ac conductivity is sensitive to surface morphology. Reactions with H2O vapor appear to account for the variations in dielectric properties. Surface dehydration was effectively accomplished by washing as-received powders in isopropanol.
Document ID
19720028750
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mountvala, A. J.
(IIT Research Institute Chicago, Ill., United States)
Date Acquired
August 6, 2013
Publication Date
November 1, 1971
Subject Category
Physics, Solid-State
Report/Patent Number
ACS PAPER 7-E-69F
Accession Number
72A12416
Funding Number(s)
CONTRACT_GRANT: NAS1-8025
Distribution Limits
Public
Copyright
Other

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