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http://hdl.handle.net/10773/19668
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DC Field | Value | Language |
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dc.contributor.author | Coondoo, Indrani | pt |
dc.contributor.author | Panwar, Neeraj | pt |
dc.contributor.author | Rai, Radheshyam | pt |
dc.contributor.author | Amorin, Harvey | pt |
dc.contributor.author | Kholkin, Andrei L. | pt |
dc.date.accessioned | 2017-12-07T19:20:50Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0141-1594 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19668 | - |
dc.description.abstract | Polycrystalline samples of lead-free Ca and Ta co-substituted potassium sodium niobate (K0.5Na0.5NbO3, KNN) ceramics have been prepared by solid state reaction technique. X-ray diffraction showed formation of a single-phase perovskite structure with orthorhombic symmetry. Substitution inhibits the grain growth, improves densification and decreases the ferro-paraelectric phase transition temperature. Temperature dependent dielectric permittivity studies demonstrate significant decrease in peak-permittivity values in the substituted samples. Bulk longitudinal piezoelectric coefficient is significantly enhanced, up to approximate to 155 pC/N for (K0.48Na0.48Ca0.02)(Nb0.85Ta0.15O3) as compared to 95 pC/N for pristine KNN ceramic. Local piezoelectric properties have been observed by piezoresponse force microscopy (PFM) technique. Distinct piezocontrast was studied in both vertical and in-plane modes of PFM for all samples. The samples exhibit self-polarization effect in the unpoled state and effective local vertical piezoelectric coefficient was the largest in Ca and Ta co-substituted sample whereas the in-plane piezoelectric coefficient was maximum for Ca-substituted KNN sample. These studies are important for using substituted lead free KNN materials in various piezoelectric applications. | pt |
dc.language.iso | eng | pt |
dc.publisher | TAYLOR & FRANCIS LTD | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F81032%2F2011/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F71289%2F2010/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/3599-PPCDT/108025/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/115085/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | THIN-FILMS | pt |
dc.subject | SOLUTION SYSTEM | pt |
dc.subject | PIEZOCERAMICS | pt |
dc.title | Synthesis and physical properties of Ca- and Ta-modified (K,Na)NbO3 lead-free piezoelectric ceramics | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 1130 | pt |
degois.publication.issue | 11 | pt |
degois.publication.lastPage | 1140 | pt |
degois.publication.title | PHASE TRANSITIONS | pt |
degois.publication.volume | 86 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1080/01411594.2013.790032 | pt |
dc.identifier.doi | 10.1080/01411594.2013.790032 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Synthesis and physical properties of Ca- and Ta-modified (KNa)NbO 3 lead-free piezoelectric ceramics_10.108001411594.2013.790032.pdf | 1.4 MB | Adobe PDF |
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