Effect of the A/B ratio on the microstructures and electrical properties of (Ba0.95±xCa0.05)(Ti0.82Zr0.18)O3 for multilayer ceramic capacitors with nickel electrodes

T. A. Jain, K. Z. Fung, Johnny Chan

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The microstructures and electrical properties of the perovskite-type (Ba0.95±xCa0.05)(Ti0.82Zr0.18)O3 oxides with various A/B ratios were studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM) with an energy-dispersive X-ray spectrometer (EDS). XRD results reveal that a second phase of Ba6Ti17O40 was formed when the A/B ratio was lower than 0.9956. TEM results show that liquid eutectic BaTiO3-Ba6Ti17O40 affects the sintering behavior and enhances grain growth; the grain size was significantly influenced when the A/B ratio changed from 0.9936 to 0.9976. The oxides' electrical performances in multilayer ceramic capacitors (MLCCs) with nickel electrodes were closely related to the A/B ratio of the powder. It was found that with decreasing A/B ratio, the maximum permittivity was increased due to a larger grain size, and the Curie point shifted to a higher temperature, which resulted in higher permittivity at room temperature. The highly accelerated life test (HALT) shows that the reliability performance became worse with a decreasing A/B ratio due to the formation of the second phase Ba6Ti17O40 at the grain boundary.

Original languageEnglish
Pages (from-to)370-374
Number of pages5
JournalJournal of Alloys and Compounds
Volume468
Issue number1-2
DOIs
Publication statusPublished - 2009 Jan 22

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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