Influence of Cation Order on the Electric Field-Induced Phase Transition in Pb(Mg1/3Nb2/3)O3-Based Relaxor Ferroelectrics

The effect of cation ordering on an electric field-induced relaxor to normal ferroelectric phase transition in Pb(Mg1/3Nb2/3)O3 (PMN)-based ceramics was investigated. Both A-site La doping and B-site Sc doping were found to enhance the chemical ordering in these relaxor ceramics. However, the enhanced chemical orderings showed different impacts on the dielectric and ferroelectric properties in these perovskite materials. The 5% La doping was observed to shift the dielectric maximum temperature (Tmax) to a significantly lower temperature and suppress the electric field-induced transition to a ferroelectric phase. In contrast, the 5% and 10% Sc doping showed little effect on Tmax but strengthened the ferroelectric coupling. The difference is discussed on the basis of cation size and charge imbalance. An electric field-temperature phase diagram is also proposed for the 0.90PMN–0.10Pb(Sc1/2Nb1/2)O3 based on its history dependence of the electric field-induced phase transition. Disciplines Ceramic Materials | Electromagnetics and Photonics | Other Mechanical Engineering Comments This is the peer reviewed version of the following article: Journal of the American Ceramic Society 89, 202-209 (2006), which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/ j.1551-2916.2005.00675.x/full. Rights This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving. This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/mse_pubs/193 1 This is the peer reviewed version of the following article: Journal of the American Ceramic Society 89, 202-209 (2006), which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/j.1551-2916.2005.00675.x/full. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving. Influence of Cation Order on the Electric Field-Induced Phase Transition in Pb(Mg1/3Nb2/3)O3-Based Relaxor Ferroelectrics Xiaohui Zhao, Weiguo Qu, Hui He, Naratip Vittayakorn, and Xiaoli Tan Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011 The effect of cation ordering on the electric field-induced relaxor to normal ferroelectric phase transition in Pb(Mg1/3Nb2/3)O3-based ceramics was investigated. Both A-site, La-doping, and Bsite, Sc-doping, were found to enhance the chemical ordering in these relaxor ceramics. However, the enhanced chemical orderings showed different impacts on the dielectric and ferroelectric properties in these perovskite materials. The 5% La-doping was observed to shift the dielectric maximum temperature (Tmax) to a significantly lower temperature and suppress the electric fieldinduced transition to a ferroelectric phase. In contrast, the 5% and 10% Sc-doping showed little effect on Tmax but strengthened the ferroelectric coupling. The difference is discussed on the basis of cation size and charge imbalance. An electric field-temperature phase diagram is also proposed for the 0.90Pb(Mg1/3Nb2/3)O3–0.10Pb(Sc1/2Nb1/2)O3 based on its history dependence of the electric field-induced phase transition. ___________________ This work was supported by the National Science Foundation through the CAREER grant DMR-0346819. Currently at Department of Chemistry, King Mongkut's Institute of Technology, Thailand. Member, American Ceramic Society. Author to whom correspondence should be addressed.