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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gao Q., Hu Q., Jin L., Gorev M. V., Chezganov D. S., Vlasov E. O., Zeng H., Zhao L., Cui Y., Xu Z., Wei X.
Заглавие : Dielectric relaxation and phase transition behavior of (1–x)Pb(Zn1/3Nb2/3)O3-xBaTiO3 binary solid solutions
Место публикации : Ceram. Int. - 2018. - Vol. 44, Is. 15. - P.18491-18498. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2018.07.069
Примечания : Cited References: 53. - This work was supported by the National Basic Research Program of China (Grant No. 2015CB654602 ), the International Science & Technology Cooperation Program of China (Grant No. 2015DFA51100 ), the NSFC projects (Grant Nos. 51761145024 and 51772239 ), Shaanxi province project 2017 ktpt-21, the Joint fund of the Ministry of Education (Grant No. 6141A02033210 ) and the 111 Project under Grant No. B14040 . The SEM work was done at International Center for Dielectric Research (ICDR), Xi’an Jiaotong University, Xi’an, China.
Ключевые слова (''Своб.индексиров.''): dielectric relaxation--phase transition--“u”-shaped variation--polarization mismatch
Аннотация: Dielectric relaxation and phase transition behaviors in (1–x)Pb(Zn1/3Nb2/3)O3-xBaTiO3 (PZN-BT) binary solid solutions have been systematically studied in this paper. All the compositions display a pure pseudo-cubic perovskite structure. As the BT contents increase from 10 mol% to 70 mol%, the phase transition peak becomes broader and broader, accompanying with decreases of ɛm (the maximum dielectric permittivity) and Tm (the temperature corresponds to the ɛm). Nevertheless, an abnormal increase of ɛm and Tm occurs when the BT contents exceeds 70 mol%, forming a “U” shaped curve of the compositional dependence of ɛm and Tm. Moreover, it is indicated from the new glass model fitting results that the characteristic parameter p, which represents the degree of relaxation, also shows a similar “U” shaped variation curve. Similarly, as shown in polarization-electric field loops, both remnant polarizations (Pr) and coercive fields (Ec) display the “U” shaped curve as the BT content changes from 10 mol% to 80 mol%. Finally, according to the similar variation of these key parameters mentioned above, a polarization mismatched model, which describes the destruction and reestablishment of the long range order arrangement in solid solutions composed of two kinds of ferroelectrics, is proposed to illustrate the underlying mechanism. In this PZN-BT system or other similar ABO3-type perovskite relaxors, the competition between the A-O and B-O coupling plays an important role to form the “U” shaped evolution of these key parameters.
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