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Significant differences in NaNbO3 ceramics fabricated using Nb2O5 precursors with various crystal structures
Li, W; Xia, X; Zeng, JT; Zheng, LY; Li, GR
2020-02-15
Source PublicationCERAMICS INTERNATIONAL
ISSN0272-8842
Issue3Pages:3759
SubtypeArticle
AbstractNaNbO3 (NN)-based solid solutions show potential applications in energy storage capacitors, strain actuators, and electrocaloric cooling devices. However, NN ceramics with distinct structures, which are prepared using various Nb2O5 precursors, have not been studied. In this work, two types of Nb2O5 precursors were used, including coexisting orthorhombic and monoclinic phases (denoted as OM), and single orthorhombic phase (denoted as O). Phase structure, grain morphology, sintering characteristics, ferroelectric performance, dielectric properties, and thermal-expansion properties were systematically investigated. Rietveld refinement of XRD data revealed that synthesized and sintered samples showed different phase structures. The content of ferroelectric phase (Q phase, space group P2(1) ma) was 82.7% in synthesized NN-OM, whereas it was only 73.2% in synthesized NN-O; it was 33.8% in sintered NN-OM, while it was 18.6% in sintered NN-O. Raman spectra verified that the Q phase in NN-OM was more than that in NN-O. Curie temperature (T-c) of NN-OM was 363 degrees C, whereas T-c of NN-O was only 352 degrees C. Furthermore, compared with NN-O, NN-OM showed an inhomogeneous grain size distribution, lower optimum sintering temperature, higher phase transition temperature, stronger ferroelectric performance, and larger thermal-expansion displacement. Therefore, crystal structure of Nb2O5 has a great influence on the structure and performances of NN ceramics.
DOI10.1016/j.ceramint.2019.10.098
WOS KeywordPHASE-TRANSITION ; SODIUM NIOBATE ; ELECTRICAL-PROPERTIES ; TEMPERATURE ; MICROSTRUCTURE ; DOMAINS
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28300
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Li, W,Xia, X,Zeng, JT,et al. Significant differences in NaNbO3 ceramics fabricated using Nb2O5 precursors with various crystal structures[J]. CERAMICS INTERNATIONAL,2020(3):3759.
APA Li, W,Xia, X,Zeng, JT,Zheng, LY,&Li, GR.(2020).Significant differences in NaNbO3 ceramics fabricated using Nb2O5 precursors with various crystal structures.CERAMICS INTERNATIONAL(3),3759.
MLA Li, W,et al."Significant differences in NaNbO3 ceramics fabricated using Nb2O5 precursors with various crystal structures".CERAMICS INTERNATIONAL .3(2020):3759.
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