Surface modification of Dy2O3-Nb2O5 dope mix for dielectric materials in aqueous dispersion

The electrokinetic mismatch between the basic dielectric compound (Ba,Ca)(T i,Zr)O-3 (BCTZ) and Dy2O3-Nb2O5 dope mix in aqueous suspensions has been im proved by a pre-firing and milling treatment of the dope mix. Pre-fired dop e mix showed a much higher zeta potential which resulted in a drastic impro vement of the particle dispersion in aqueous slurries. By use of surface-mo dified dope mix the homogeneity of the micro structure of multilayer cerami c capacitors is improved and the break-down voltage of thin (7 mu m) dielec tric layers increased. The results observed indicate the critical influence of the micro structural homogeneity on the breakdown voltage of MLCCs. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.