Domain structures in multilayer ceramic capacitors studied by polarized Raman spectroscopy

✍ Scribed by Okai, Keisuke ;Zhu, Wenliang ;Pezzotti, Giuseppe

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 731 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201000108

✦ Synopsis

Abstract

Barium titanate (BaTiO~3~), the most popular dielectric material for use in multilayer ceramic capacitors (MLCC), is often doped with rare earths ions to tailor its properties (e.g., Curie temperature, dielectric loss, and temperature coefficient of capacitance) and to control the mobility of its internal domain structure. The concurrent needs of device miniaturization and reliability improvement have challenged technologists to refine the design criteria regarding both material characteristics and device structure. However, further improvements cannot be easily achieved by merely empirical approaches and call for more systematic characterizations from the material physics viewpoint. This paper emphasizes the effect on the dielectric properties that arise from the formation of internal domain structures. A confocal/polarized Raman spectroscopic algorithm is developed and applied to quantitative characterizations of domain structures in BaTiO~3~ and applied to non‐destructive diagnostics of an MLCC device.