Absorption of domain walls to oxygen vacancies investigated through internal friction techniqueW. Li, J. Ma, K. Chen, D. Su and J. S. Zhu
National Laboratory of Solid State Microstructures, Department of Physics Nanjing University - Nanjing 210093, PRC
received 9 May 2005; accepted in final form 27 July 2005
published online 31 August 2005
We found that 90 domain walls are absorptive to oxygen vacancies and the absorbing degree was related with the morphology of 90 domain walls: curved 90 domain walls are more absorptive to oxygen vacancies compared with straight 90 domain walls. Therefore, in ferroelectric materials with curved 90 domain walls, the density of oxygen vacancies diffusing to and subsequently pinning the 180 domain walls is greatly suppressed, resulting in their excellent fatigue resistance.
77.84.-s - Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials.
77.80.Dj - Domain structure; hysteresis.
62.40.+i - Anelasticity, internal friction, stress relaxation, and mechanical resonances.
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