NDLI: Effect of vanadium substitution on electrical and piezoelectric properties of lead-free (K$_{0.5}$Na$_{0.5}$)NbO$

Content Provider	Springer Nature Link
Author	Jiten, Chongtham Chandramani Singh, K.
Copyright Year	2016
Abstract	During the last decade, efforts have been made towards developing lead-free piezoelectric ceramics which can replace the currently dominant but highly superior lead-based piezoelectric materials such as PZT. (K$_{0.5}$Na$_{0.5}$)NbO$_{3}$-based piezoelectrics are one promising candidate because of their relatively high Curie temperatures and piezoelectric coefficients. In the present work, powders of (K$_{0.5}$Na$_{0.5}$)(Nb$_{1−x }$V$_{ x }$)O$_{3}$ (x = 0, 0.01, 0.02, 0.03, 0.04 and 0.05) were synthesized by conventional solid state reaction of K$_{2}$CO$_{3}$, Na$_{2}$CO$_{3}$, Nb$_{2}$O$_{5}$, and V$_{2}$O$_{5}$. The powders were high-energy milled in isopropyl alcohol medium using a Retsch PM 100 planetary ball mill at the speed of 200 rpm for 8 h. The milled powders were sintered at 1080 °C for 1 h in closed alumina crucible. The crystalline phase of the ceramics was found to be perovskite with orthorhombic symmetry. Increasing V$^{5+}$ content in the ceramics from x = 0 to x = 0.03 gives rise to gradual increase in room temperature dielectric constant (ε $_{ r }$) from 346 to 432, remnant polarization (P $_{ r }$) from 6.2 to 9.6 μC/cm$^{2}$, electromechanical coupling factor (k $_{ p }$) from 0.35 to 0.39, and piezoelectric charge constant (d $_{33}$) from 76 to 93 pC/N. The increase in these parameters is attributed to the associated increase in density of the ceramics with increasing V$^{5+}$ content. Further increase in V$^{5+}$ content to x = 0.05 results in decrease in ε $_{ r }$, P $_{ r }$, k $_{ p }$ and d $_{33}$ to 390, 4.7 μC/cm$^{2}$, 0.33 and 67 pC/N respectively. The study reveals that an optimum concentration of V$^{5+}$ can enhance the dielectric, ferroelectric and piezoelectric properties of (K$_{0.5}$Na$_{0.5}$)NbO$_{3}$ system.
Starting Page	507
Ending Page	513
Page Count	7
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	28
Issue Number	1
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2016-08-20
Publisher Place	New York
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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