{"title":"Effect of Manganese Doping on Ferrroelectric Properties of (K0.485Na0.5Li0.015)(Nb0.98V0.02)O3 Lead-Free Piezoceramic","authors":"Chongtham Jiten, Radhapiyari Laishram, K. Chandramani Singh","volume":126,"journal":"International Journal of Mathematical and Computational Sciences","pagesStart":434,"pagesEnd":439,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10007224","abstract":"
Alkaline niobate (Na0.5<\/sub>K0.5<\/sub>)NbO3<\/sub> ceramic system has attracted major attention in view of its potential for replacing the highly toxic but superior lead zirconate titanate (PZT) system for piezoelectric applications. Recently, a more detailed study of this system reveals that the ferroelectric and piezoelectric properties are optimized in the Li- and V-modified system having the composition (K0.485<\/sub>Na0.5<\/sub>Li0.015<\/sub>)(Nb0.98<\/sub>V0.02<\/sub>)O3<\/sub>. In the present work, we further study the pyroelectric behaviour of this composition along with another doped with Mn4+<\/sup>. So, (K0.485<\/sub>Na0.5<\/sub>Li0.015<\/sub>)(Nb0.98<\/sub>V0.02<\/sub>)O3 <\/sub>+ x<\/em> MnO2<\/sub> (x<\/em> = 0, and 0.01 wt. %) ceramic compositions were synthesized by conventional ceramic processing route. X-ray diffraction study reveals that both the undoped and Mn4+<\/sup>-doped ceramic samples prepared crystallize into a perovskite structure having orthorhombic symmetry. Dielectric study indicates that Mn4+<\/sup> doping has little effect on both the Curie temperature (T<\/em>c<\/sub>) and tetragonal-orthorhombic phase transition temperature (T<\/em>ot<\/sub>). The bulk density, room-temperature dielectric constant (ε<\/em>RT<\/sub>), and room-c The room-temperature coercive field (E<\/em>c<\/sub>) is observed to be lower in Mn4+<\/sup> doped sample. The detailed analysis of the P-E<\/em> hysteresis loops over the range of temperature from about room temperature to T<\/em>ot<\/sub> points out that enhanced ferroelectric properties exist in this temperature range with better thermal stability for the Mn4+<\/sup> doped ceramic. The study reveals that small traces of Mn4+<\/sup> can modify (K0.485<\/sub>Na0.5<\/sub>Li0.015<\/sub>)(Nb0.98<\/sub>V0.02<\/sub>)O3 <\/sub>system so as to improve its ferroelectric properties with good thermal stability over a wide range of temperature.<\/p>\r\n","references":"[1]\tB. Jaffe, \u201cPiezoelectric Ceramics,\u201d New York: Academic Press, pp. 214-217, 1971.\r\n[2]\tY. Guo, K. Kakimoto, H. Ohsato, \u201cPhase transitional behavior and piezoelectric properties of (Na0.5K0.5)NbO3\u2013LiNbO3 ceramics,\u201d Appl. Phys. Lett., 85, pp. 4121\u20134123, 2004.\r\n[3]\tB. Malic, J. Bernard, J. Hole, D. Jenko, M. Kosec, \u201cAlkaline-earth doping in (K,Na)NbO3 based piezoceramics,\u201d J. Eur. Ceram. Soc., 25, pp.2707\u20132711, 2005.\r\n[4]\tJ.F. Li,; K. Wang, B.P. Zhang, L.M. Zhang, \u201cFerroelectric and piezoelectric properties of fine-grained Na0.5K0.5NbO3 lead-free piezoelectric ceramics prepared by spark plasma sintering,\u201d J. Am. Ceram. 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