Low-sintering composite multilayer ceramic capacitors with X7R specification

The low-sintering composite multilayer ceramic capacitors (CMLCCs) having K value in excess of 7200 with X7R characteristics (- 55 to + 125 degreesC, +/- 15%) has been successfully developed. The CMLCCs incorporate four PMN-P NN-PT or PMN-PT based ceramics with different Curie temperatures as the pri ncipal components. The green tapes and inner electrode are stacked during g reen printing according to a certain order and co-fired to prepare this kin d of multimaterials multilayer chip component with a usual co-firing techni que. The property of the dielectric constant (K) over a temperature range f rom - 55 to + 125 degreesC can be determined approximately by the proportio n of the four dielectrics with different Curie temperatures according to th e parallel connecting model of capacitance. The small difference between th e calculative curve and testing curve can be explained by the mutual diffus ion among different dielectrics via the inner 30%Pd-70%Ag electrode. The CM LCCs have good microstructure. The research results show that it is feasibl e to produce chip components with high performance by co-firing multiphases materials (C) 2001 Elsevier Science B.V. All rights reserved.