Novel non-stoichiometric (Ba0.91Ca0.09)x(Zr0.18Ti0.82)O3 ferroelectric ceramics with improved diffuse phase transition and dielectric tunable performance.
In: Ceramics International, Jg. 47 (2021-09-15), Heft 18, S. 25901-25909
academicJournal
Zugriff:
Dielectric tunable properties in ferroelectric ceramics have been optimized by a variety of approaches, e.g., isovalent/aliovalent substitution, system composite et al., while the study of non-stoichiometric regulation on the performance of BCZT ceramics was rarely concerned. Herein, a series of novel non-stoichiometric (Ba 0·91 Ca 0.09) x (Zr 0·18 Ti 0.82)O 3 (BCZT x) ceramic specimens were successfully prepared via solid-state reaction. The microstructures of BCZT x ceramics are simultaneously investigated through XRD and SEM. The diffuse phase transition (DPT) behaviour of BCZT x ceramics are studied by the Lorentz-type empirical formula. The significant enhancement of DPT behaviour is observed at x = 1.03, which probably due to the coaction of the generation of partial Schottky defects and prominent reduction of grain size. Furthermore, a high tunability (k) 87.80%, low dielectric loss (tan δ) 0.141%, and a remarkably enhanced FOM of 623 are achieved in x = 0.99 at a low DC bias electric fields (BEFs) of 7.28 kV/cm and room temperature (RT), which is superior to that of the stoichiometric BCZT ceramics and other available reported BT-based ceramics systems in term of the dielectric tunable properties. Meanwhile, it shows that the temperature dependent CQF value of x = 0.99 remained advantageous around the RT. These findings suggested that non-stoichiometric BCZT x ceramics with x = 0.99 are significantly competitive in the applications of dielectric tunable devices at RT. The non-stoichiometric regulation is an effective approach in improving the dielectric tunability properties of BCZT ceramics. [ABSTRACT FROM AUTHOR]
Titel: |
Novel non-stoichiometric (Ba0.91Ca0.09)x(Zr0.18Ti0.82)O3 ferroelectric ceramics with improved diffuse phase transition and dielectric tunable performance.
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Autor/in / Beteiligte Person: | Xu, Kangli ; Li, Lingxia ; Yang, Pan ; Peng, Wei |
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Zeitschrift: | Ceramics International, Jg. 47 (2021-09-15), Heft 18, S. 25901-25909 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0272-8842 (print) |
DOI: | 10.1016/j.ceramint.2021.05.321 |
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