Pinning Effects on the Dielectric and Ferroelectric Properties of Mn-Doped Ba(Zr_0.06Ti_0.94)O₃ Ceramics

Abstract:

Lead-free ceramics with the composition of Mn-doped Ba(Zr_0.06Ti_0.94)O₃ – xmol%MnO₂ (BZT6-xMn, x=0, 1 and 2) have been synthesized by a mixed oxide process. Structure and micrograph characterization were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM), which revealed that all samples have the orthorhombic phase with dense and the uniform microstructure. The grain size of Mn-doped BZT6 ceramics decreased with increasing MnO₂ doping. The effect of MnO₂ doping on the dielectric and ferroelectric properties was also investigated. The maximum dielectric permittivity decreased dramatically with increasing MnO₂ doping in the BZT6 ceramics. A peculiar double-hysteresis-like loop was observed. Mn ions as acceptor doping occupy the B site of ABO₃ in the form of Mn²⁺ and Mn³⁺, which brought an increase in the oxygen vacancies concentration. The defect dipole model was explained the pinning mechanism.

• Periodical: Materials Science Forum (Volume 687)
• Pages: 354-358
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.687.354
• Online since: June 2011
• Authors: Shu Juan Kuang, Xin Gui Tang, Jun Bo Wu, Yan Ping Jiang, Qiu Xiang Liu
• Keywords: Ba(Zr,Ti)O₃, Ceramic, Dielectric, Ferroelectric, Mn-Doping, Pinning Effect

References

[1] P. Victor, R. Ranjith, S.B. Krupanidhi: J. Appl. Phys. Vol. 94 (2003), p.7702.

[2] Y. Zhi, A. Chen, R.Y. Guo, A.S. Bhalla: Mater. Lett. Vol. 61 (2007), p.326.

[3] A. Dixit, S.B. Majumder, A. Savvinov, R.S. Katiyar, R.Y. Guo, A.S. Bhalla: Mater. Lett. Vol. 56 (2002), p.933.

[4] X.G. Tang, K.H. Chew, H.L.W. Chan: Acta Mater. Vol. 52 (2004), p.5177.

[5] W.Q. Cao, J.W. Xiong, J.P. Sun: Mater. Chem. Phys. Vol. 106 (2007), p.338.

[6] D. Shan, Y.F. Qu, J.J. Song: Solid State Commun. Vol. 141 (2007), p.65.

[7] F. Moura, A.Z. Simoes, L.S. Cavlcante, M.A. Zaghete, J.A. Varela, E. Longo: J. Alloys Compounds, Vol. 466 (2008), p. L15.

[8] X.J. Chou, J.W. Zhai, X. Yao: Mater. Chem. Phys. Vol. 109 (2008), p.125.

[9] Y.L. Wang, L.T. Li, J.Q. Qi, Z.L. Gui: Ceram. Int. Vol. 28 (2002), p.657.

[10] X.G. Tang, J. Wang, X.X. Wang, H.L.W. Chan: Solid State Commun. Vol. 131 (2004), p.163.

[11] Q. Zhang, R.W. Whatore: J. Appl. Phys. Vol. 94 (2003), p.5228.

[12] J.H. Chen, S.B. Qu, K.H. Gao, Z.B. Pei, L.H. Zhu: Rare Metal Mater. Eng. Vol. 35(2006), p.1704 (In Chinese).

[13] Z.P. Cao, A.L. Ding, Y. Zhang, P.S. Qiu, X.S. Zheng: Solid State Communi. Vol. 131(2004), p.57.

[14] B.S. Li, Z.G. Zhu, G.R. Li, Q.R. Yin, A.L. Ding: Acta Phys. Sinica, Vol. 54(2005), p.939 (In Chinese).