Reduced degree of phase coexistence in KNN-Based ceramics by competing additives
KAUST DepartmentDivision of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 239955, Kingdom of Saudi Arabia
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2020-02-21
Print Publication Date2020-07
Permanent link to this recordhttp://hdl.handle.net/10754/662090
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AbstractThis work reveals the role of Bi3+ in the controlling ability of (Bi0.5Ag0.5)ZrO3 to the phase structure of potassium sodium niobate based ceramics by introducing Ba2+. The substitution on (Bi0.5Ag0.5)2+ with Ba2+ results in the reduced degree of phase coexistence, accompanying the phase transition from coexisting orthorhombic-tetragonal (O–T) phases to an orthorhombic (O) phase, which is demonstrated by the systematic phase structure analysis and variations of electrical properties. The analysis reveals that the high electronegativity of Bi3+ results in the increased covalent bond character and then increases the stabilization of the T phase, leading to a decrease in orthorhombic-tetragonal phase transition temperature (T O-T). Therefore, this work not only compares the controlling ability of Ba2+ and (Bi0.5Ag0.5)2+ to T O-T but also reveals which and how elements cause the decreased T O-T, promoting the understanding of the effect of additives on the phase structure.
CitationLv, X., Wu, J., & Zhang, X. (2020). Reduced degree of phase coexistence in KNN-Based ceramics by competing additives. Journal of the European Ceramic Society. doi:10.1016/j.jeurceramsoc.2020.02.044
SponsorsThe authors appreciate the support from the National Natural Science Foundation of China (Grants 51722208 and 51972215) and the Key Technologies Research and Development Program of Sichuan Province (Grant 2018JY0007). We thank Prof. Jürgen Rödel (Technische Universität Darmstadt) for measuring in situ temperature-dependent small signal d values.