Synthesis and physical properties of Ca- and Ta-modified (K,Na)NbO3 lead-free piezoelectric ceramics
authors Coondoo, I; Panwar, N; Rai, R; Amorin, H; Kholkin, AL
nationality International
journal PHASE TRANSITIONS
author keywords lead-free piezoelectric; co-substitution; piezoresponse force microscopy; KNN
keywords THIN-FILMS; SOLUTION SYSTEM; PIEZOCERAMICS
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.
publisher TAYLOR & FRANCIS LTD
issn 0141-1594
year published 2013
volume 86
issue 11
beginning page 1130
ending page 1140
digital object identifier (doi) 10.1080/01411594.2013.790032
web of science category Crystallography; Physics, Condensed Matter
subject category Crystallography; Physics
unique article identifier WOS:000327475900010
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 1.004
5 year journal impact factor 1.018
category normalized journal impact factor percentile 21.558
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg