NDLI: Lead-free vanadium-substituted (K$_{0.485}$Na$_{0.5}$Li$_{0.015}$)(Nb$_{0.9}$Ta$_{0.1}$)O$_{3}$ piezoceramics synthesized from nanopowders

Content Provider	Springer Nature Link
Author	Gaur, Roopam Sangal, Maitreyi Dwivedi, Arpit Singh, K. Chandramani
Copyright Year	2014
Abstract	Lead-free, alkaline niobate-based piezoelectric ceramics substituted with vanadium (K$_{0.485}$Na$_{0.5}$Li$_{0.015}$)(Nb$_{0.9−x }$Ta$_{0.1}$V$_{ x }$)O$_{3}$ (x = 0, 0.05, 0.10, 0.15 and 0.2) were synthesized from nanocrystalline powders by traditional solid state sintering technique. The base composition chosen is among those recently reported to show high piezoelectric properties. The nanocrystalline powders were produced by high energy ball milling. The crystalline phase of all the ceramics prepared was found to be perovskite with orthorhombic symmetry. Without any sintering aid, the bulk density of 97 % of the theoretical density was obtained for the ceramics with no vanadium. The optimum sintering temperature for all compositions was achieved at a low value of 1,050 °C. In the composition range studied, increasing V$^{5+}$ content in the ceramics gives rise to a gradual decrease in room temperature dielectric constant (ε $_{ r }$) from 1,193 to 474, remnant polarization (P $_{ r }$) from 12.9 to 5.6 μC/cm$^{2}$, electromechanical coupling factor (k $_{ p }$) from 0.45 to 0.32, and piezoelectric charge constant (d $_{33}$) from 156 to 53 pC/N. The decrease in these parameters is attributed to the associated decrease in density and grain size of the ceramics with increasing V$^{5+}$ content. Increasing V$^{5+}$ content from 0 to 0.15 results in an increase in the coercive field from 9.9 to 15.5 kV/cm, thereby, making the ceramics harder in this range of composition.
Starting Page	3195
Ending Page	3202
Page Count	8
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	25
Issue Number	7
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2014-05-21
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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