Effects of Rare-Earth Oxides on the Reliability of X7R Dielectrics

The effects of rare-earth oxides, e.g., La, Nd, Sm, Dy and Yb, on the reliability of multilayer capacitors (MLCs) with X7R dielectrics and Ni electrodes were investigated. Microstructures of the dielectrics were analyzed by TEM and electron probe microanalysis in order to characterize the rare-earth...

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Published inJapanese Journal of Applied Physics Vol. 41; no. Part 1, No. 9; pp. 5668 - 5673
Main Authors Sakabe, Yukio, Hamaji, Yukio, Sano, Harunobu, Wada, Nobuyuki
Format Journal Article
LanguageEnglish
Published 2002
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Summary:The effects of rare-earth oxides, e.g., La, Nd, Sm, Dy and Yb, on the reliability of multilayer capacitors (MLCs) with X7R dielectrics and Ni electrodes were investigated. Microstructures of the dielectrics were analyzed by TEM and electron probe microanalysis in order to characterize the rare-earth ions. Incorporation of rare-earth ions to BaTiO3 ceramics depended on their ionic radius, resulting in different microstructures and electric performances of dielectrics. Dy ions provided BaTiO3 ceramics with ideal X7R characteristics and high reliability. The mechanism governing leakage current was discussed in terms of the voltage dependence of leakage current. Electric properties and related reliability of the capacitors were attributed to solubility, distribution of rare-earth oxides and their occupation site in BaTiO3. 13 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.41.5668