Deterioration behavior analysis of dysprosium and thulium co-doped barium titanate ceramics for multilayer ceramic capacitors

作者：Kim Jinseong; Noh Taimin; Jeon Seol; Park Sanghu; Chun Hohwan; Lee Heesoo^*

来源：Ceramics International, 2012, 38(8): 6837-6842.

DOI：10.1016/j.ceramint.2012.05.083

• Dielectric properties
• Lifetime
• BaTiO3 and titanates
• Perovskite

An accelerated testing method for barium titanate (BaTiO3) dielectrics was proposed to elucidate deterioration behavior of dielectric constant based on the life-temperature relation. The accelerated degradation test (ADT) which was designed using various temperature ranges below and above Curie temperature (T-c) was focused on the optimized composition of dysprosium (Dy) and thulium (Tm) co-doped BaTiO3. The statistical analysis of the failure time data was performed to determine the optimum distribution as a goodness-of-fitness test. A scale parameter (eta) and activation energy (E-alpha) were calculated in order to predict the life time of the co-doped BaTiO3, and there was difference between the expected life times according to the acceleration temperature rating of the ADT. The difference of deterioration mechanism around T-c could be deduced from the change of lattice parameter and polarization behavior. The drastic decrease of tetragonality and ferroelectric property caused by the phase transition of the co-doped BaTiO3 was verified in the temperature above T-c. Accordingly, the acceleration factor over T-c should be considered as reliability study of the BaTiO3 dielectrics for multilayer ceramic capacitors (MLCCs).

• 出版日期2012-12