Synthesis and physical properties of Ca- and Ta-modified (K,Na)NbO3 lead-free piezoelectric ceramics

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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.

keywords

THIN-FILMS; SOLUTION SYSTEM; PIEZOCERAMICS

subject category

Crystallography; Physics

authors

Coondoo, I; Panwar, N; Rai, R; Amorin, H; Kholkin, AL

our authors

foto Andrei Kholkin

Andrei Kholkin

Retired Researcher
foto Indrani Coondoo

Indrani Coondoo

Junior Researcher
foto Radheshyam Rai

Radheshyam Rai

Post-doc Fellowship

Groups

G2 - Photonic, Electronic and Magnetic Materials

Projects

NOLEAD: Novel lead-free ferroelectric films by PLD for optoelectronics (PTDC/FIS/108025/2008)

Development of novel lead-free materials for piezoelectric energy harvesting (PTDC/CTM-CER/115085/2009)

acknowledgements

Authors (IC and NP) would like to thank the Portuguese foundation FCT for financial support through projects SFRH/BPD/81032/2011 and SFRH/BPD/71289/2010, respectively. Financial support from FCT through projects PTDC/FIS/108025/2008 and PTDC/CTM-CER/115085/2009 is also acknowledged. Financial support by Spanish MICINN project MAT2011-23709 is also acknowledged.

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Publication Details

type
Journal Article
year
2013
journal
PHASE TRANSITIONS
volume
86
publisher
TAYLOR & FRANCIS LTD
issn
0141-1594
issue
11
digital object identifier
10.1080/01411594.2013.790032
web of science article identifier
WOS:000327475900010

Journal Metrics (JCR 2019)

Journal Impact Factor
1.004
Journal Impact Factor (5 yrs)
1.018
category normalized journal percentile
21.558

Citations

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