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http://hdl.handle.net/10773/19668
Title: | Synthesis and physical properties of Ca- and Ta-modified (K,Na)NbO3 lead-free piezoelectric ceramics |
Author: | Coondoo, Indrani Panwar, Neeraj Rai, Radheshyam Amorin, Harvey Kholkin, Andrei L. |
Keywords: | THIN-FILMS SOLUTION SYSTEM PIEZOCERAMICS |
Issue Date: | 2013 |
Publisher: | TAYLOR & FRANCIS LTD |
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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19668 |
DOI: | 10.1080/01411594.2013.790032 |
ISSN: | 0141-1594 |
Publisher Version: | 10.1080/01411594.2013.790032 |
Appears in Collections: | CICECO - Artigos |
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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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