Influences of protective atmosphere on the characterization and properties of NaSr2Nb5O15 lead-free piezoelectric ceramics by sol–gel method

NaSr 2 Nb 5 O 15 lead-free piezoelectric ceramics were prepared by the sol–gel method, they were sintered at different temperatures with or without protective atmosphere. The influences of sintering temperature and protective atmosphere on the characterization and properties of the ceramics were inv...

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Bibliographic Details
Published in:Bulletin of materials science 2015-10, Vol.38 (6), p.1479-1486
Main Authors: ZHANG, TIAN-HANG, LIU, YAN-GAI, ZHAO, JIN-QIU, HUANG, ZHAO-HUI, FANG, MING-HAO
Format: Article
Language:English
Subjects:
Atmosphere
Ceramics
Chemistry and Materials Science
Controlled atmospheres
Curie temperature
Density
Dielectric properties
Engineering
Ferroelectric materials
Ferroelectricity
Grain size
Lead free
Materials Science
Methods
Piezoelectric ceramics
Relaxors
Sintering
Sol-gel processes
Temperature
Tungsten bronze
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Summary:NaSr 2 Nb 5 O 15 lead-free piezoelectric ceramics were prepared by the sol–gel method, they were sintered at different temperatures with or without protective atmosphere. The influences of sintering temperature and protective atmosphere on the characterization and properties of the ceramics were investigated. All the ceramics showed the pure tungsten bronze structure and an intermediate relaxor-like behaviour between normal and ideal relaxor ferroelectrics according to the modified Curie–Weiss law. The sintering temperature affected significantly the properties of ceramics, with the sintering temperature increased both with and without protective atmosphere, the ε r , d 33 , K p and P r of these ceramics initially increased and decreased finally, whereas the variation of Q m and E c showed the opposite tendency. Furthermore, the protective atmosphere also significantly affected the properties of these ceramics, ε r , d 33 , K p and P r of such ceramics sintered with protective atmosphere were superior to those of the ceramics sintered without protective atmosphere, while the tan δ , Q m and E c gave the contrary results.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-015-0979-8