Abstract
The study investigating the electrical properties of dense lead-free piezoelectric ceramics in the (1-x)Sr<sub>2</sub>NaNb<sub>5</sub>O<sub>15</sub>-xCa2NaNb5O15 (SCNN) system with x ranging from 0.05 to 0.35 is reported here. Materials were produced with Spark Plasma Sintering (SPS) method. X-Ray diffraction patterns all showed a single tetragonal tungsten bronze phase, peak broadening being seen on increasing the Ca content. The lattice constant calculation indicated distortion and shrinkage of the crystal structure with Ca substitution. Ferroelectric and piezoelectric properties of SCNN greatly depended on the Ca content. The composition with x =0.15 exhibited the greatest polarization with Pr =3.0 <i>μ</i>C cm<sup>-2</sup>and piezoelectric constant of d<sub>33</sub> =96 pC/ N, whereas the compositions with x =0.30 and 0.35 almost lost their ferroelectricity and piezoelectricity. Not only investigation of materials properties but also application possibility as a sensor is surveyed. The ultrasonic waves generated by SCNN material as a sensor are much clearer that that by commercially available PZT materials. This study apparently indicates that lead-free SCNN piezoelectric ceramics have potential for electromechanical application.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.