Tu, Chi-ShunDing, Y.Yang, W.-C.Wang, T.-H.Chien, R. R.Schmidt, V. HugoYao, Y.-D.Wu, K.-T.2019-02-082019-02-082011C.-S. Tu, Y. Ding, W.-C. Yang, T.H. Wang, R.R. Chien, V.H. Schmidt, Y.D. Yao, and K.T. Wu, “Dielectric permittivity and magnetoelectric coupling in multiferroic BiFeO3 and (Bi0.95La0.05)FeO3 ceramics,” IEEE Transactions on Magnetics 47, 3343-3346 (2011), doi: 10.1109/TMAG.2011.2148104.0018-9464https://scholarworks.montana.edu/handle/1/15231Dielectric permittivity and loss of BiFeO 3 (BFO) and 5 mol% lanthanum-substituted BFO [(Bi 0.95 La 0.05 )FeO 3 or BFO-5% La] ceramics have been carried out as functions of temperature and frequency. A frequency-dependent and broad dielectric shoulder and maximum were observed in BFO and BFO-5% La near 600-700 K. These dielectric responses are likely due to the magnetoelectric coupling while the antiferromagnetic-paramagnetic transition takes place near the Néel temperature. As an approximation, a barrier model with intrinsic barriers B (in temperature unit) every lattice constant a and extrinsic barriers B +Δ every distance d is introduced to describe the low-frequency upturn in dielectric loss in the high-temperature region. Good qualitative fits are obtained for BFO and BFO-5% La. This work suggests that 5 mol% La substitution can enhance dielectric response and considerably reduce electric conductivity.enThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).http://rightsstatements.org/vocab/InC/1.0/Article