Effect of domain wall on the dielectric properties of the BaTiO3/SrTiO3 superlattices

✍ Scribed by J.H. Qiu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 374 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.03.001

✦ Synopsis

Based on a phenomenological thermodynamical theory, the effect of the domain wall on the dielectric properties of the polydomain BaTiO 3 /SrTiO 3 superlattices with 180°electric domains in the BaTiO 3 layer is investigated. Theoretical analysis indicates that complete polarization suppression and the largest dielectric response take place at approximately 72% and 53% of the critical volume fraction of the SrTiO 3 layer for the domain wall energy parameter A = 3×10 7 and 5×10 7 , respectively. The dielectric properties largely depend on both the volume fraction of the SrTiO 3 layer and the domain wall energy parameter.

Moreover, the gigantic dielectric response which occurs in single-domain BaTiO 3 /SrTiO 3 superlattices cannot appear due to the 180°polydomain state in the BaTiO 3 layer, which is in agreement with the previous prediction. The high domain wall energy parameter results in the stabilization of the paraelectric state in the BaTiO 3 layer, however, the enhancement of the domain wall energy parameter within a certain scale increases the dielectric properties greatly.