Title :
Stability of Ni electrodes and Ni-BaTiO3 interface evolution in ultrathin BME MLCCs
Author :
Polotai, A.V. ; Shay, D.P. ; Yang, G.Y. ; Dickey, E.C. ; Randall, C.A.
Author_Institution :
Center for Dielectric Studies, Department of Materials Science and Engineering, The Pennsylvania State University, University Park, 16802, U.S.A.
Abstract :
Microstructural control in thin-layer multilayer ceramic capacitors (MLCC) is one of the present day challenges for maintaining an increase in capacitive volumetric efficiency. It is observed that the continuity of the Ni electrodes increases with increasing heating rate but behaves non-linearly on sintering temperature. It is proposed that an interfacial liquid alloy layer initiates when the Ni electrodes are under tension. This accelerates a stress-induced diffusion which is the key cause of the severe electrode discontinuities during heating. Kinetic and thermodynamic approaches based on the control of sintering profiles or the control of Ni-BaTiO3 interface chemistry are proposed to prevent the Ni electrode discontinuity.
Keywords :
Acceleration; Capacitors; Ceramics; Electrodes; Heating; Kinetic theory; Nickel alloys; Nonhomogeneous media; Stability; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 2008. ISAF 2008. 17th IEEE International Symposium on the
Conference_Location :
Santa Re, NM, USA
Print_ISBN :
978-1-4244-2744-4
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2008.4693884
