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Rare earth doped zinc oxide varistors

United States Patent

5,854,586
December 29, 1998
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A varistor includes a Bi-free, essentially homogeneous sintered body of a ceramic composition including, expressed as nominal weight %, 0.2-4.0% oxide of at least one rare earth element, 0.5-4.0% Co.sub.3 O.sub.4, 0.05-0.4% K.sub.2 O, 0.05-0.2% Cr.sub.2 O.sub.3, 0-0.2% CaO, 0.00005-0.01% Al.sub.2 O.sub.3, 0-2% MnO, 0-0.05% MgO, 0-0.5% TiO.sub.3, 0-0.2% SnO.sub.2, 0-0.02% B.sub.2 O.sub.3, balance ZnO.
McMillan; April D. (Knoxville, TN), Modine; Frank A. (Oak Ridge, TN), Lauf; Robert J. (Oak Ridge, TN), Alim; Mohammad A. (Medina, OH), Mahan; Gerald D. (Oak Ridge, TN), Bartkowiak; Miroslaw (Oak Ridge, TN)
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
08/ 932,948
September 17, 1997
The United States Government has rights in this invention pursuant to contract no. DE-AC05-960R22464 between the United States Department of Energy and Lockheed Martin Energy Research Corporation.