Effect of lead oxide on niobium-doped titania varistors

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb04308.x· OSTI ID:7293526

Wu, J M; Lai, C H ^[1]

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1. Dept. of Materials Science and Engineering, National Tsing Hua Univ., Hsinchu 30043 (TW)

In this paper the effect of PbO on Nb-doped TiO{sub 2} varistors is investigated. It was found that the PbO dopant had significant effect on the varistor properties of Nb-doped TiO{sub 2} ceramics. There existed an optimal range of PbO starting from 0.25 to 1 mol% for the nonlinear I-V characteristics of the 0.25 at.% Nb-doped TiO{sub 2} ceramics. within this PbO range, an effective boundary energy barrier of about 0.70 eV was created which yielded nonlinear I-V characteristics with {alpha} = 7.6. In contrast, {alpha} values of the samples containing PbO dopant outside this optimal range are only about 2 to 3. The effect of PbO on TiO{sub 2} varistors was analyzed by impedance spectroscopy, C-V and dielectric measurements, and X-ray diffraction, as well as scanning electron microscopy. The results are discussed in the text.

• OSTI ID: 7293526
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:12; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
ALLOYS
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
DIFFRACTION
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
IMPEDANCE
LEAD ADDITIONS
LEAD ALLOYS
LEAD COMPOUNDS
LEAD OXIDES
MICROSCOPY
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SCATTERING
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION