Phenomenological Model for Pyroelectric Effects of Nano Graded Ferroelectric Films

Abstract:

In order to improve the pyroelectric properties of nanograded ferroelectric films (NGFF), and provide a theoretical reference for practical applications, the generalized Ginzburg-Landau-Denvonshire (GLD) theory is adopted to investigate the pyroelectric properties of the NGFF. A function is introduced to characterize the local structure in nanograded films. Influence of the local structure, film thickness and external electric field on the polarization distribution and pyroelectric properties are mainly discussed. The numerical results show that parameterand film thickness are two very important factors that influence the film properties, larger values lead to smaller spontaneous polarization and lower pyroelectric peak. Different directions of the external electric field can lead to greatly different effects on pyroelectric behaviors, whose effects is to expand the working temperature region, or else, change the order of phase transition.

• Periodical: Applied Mechanics and Materials (Volumes 110-116)
• Pages: 3358-3363
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.110-116.3358
• Online since: October 2011
• Authors: Hui Chen, Tai Min Cheng
• Keywords: Curie Temperature, Ferroelectric Film, Polarization, Pyroelectric Coefficient

References

[1] A. Sharma, Z. -G. Ban, S.P. Alpay, and J.V. Mantese, Effect of operating temperature and film thickness on the pyroelectric response of ferroelectric materials, Appl. Phys. Lett., Vol. 84, p.4959–4961, (2004).

DOI: 10.1063/1.1762691

[2] F. Jin, G.W. Auner, R. Naik, N.W. Schubring, J.V. Mantese, A.B. Catalan and A.L. Micheli, Giant effective pyroelectric coefficients from graded ferroelectric devices, Appl. Phys. Lett., Vol. 73, p.2838–2840, (1998).

DOI: 10.1063/1.122607

[3] W.G. Liu, J.S. Ko, and W.G. Zhu, Preparation and properties of multilayer Pb(Zr, Ti)O3/PbTiO3 thin films for pyroelectric application, Thin Solid Films, Vol. 371, p.254–258, (2000).

DOI: 10.1016/s0040-6090(00)01012-9

[4] C. Yoshida, A. Yoshida, and H. Tamura, Nanoscale conduction modulation in Au/Pb(Zr, Ti)O3/SrRuO3 heterostructure, Appl. Phys. Lett., Vol. 75, p.1449–1451, (1999).

DOI: 10.1063/1.124721

[5] G.S. Wang, X.J. Meng, J.L. Sun, Z.Q. Lai, J. Yu, S.L. Guo, J.G. Cheng, J. Tang, and J.H. Chu, PbZr0. 5Ti0. 5O3/La0. 5Sr0. 5CoO3 heterostructures prepared by chemical solution routes on silicon with no fatigue polarization, Appl. Phys. Lett., Vol. 79, p.3476–3478, (2001).

DOI: 10.1063/1.1419234

[6] T. Q. Lü, and W. W. Cao, Gneralized Continuum Theory for Ferroelectric Thin Films, Phys. Rev. B., vol. 66, pp.024102-1–024102-5, (2002).

[7] D. Akai, M. Yokawa, K. H. yashi, K. Matsushita, K. Sawada, and M. Ishida, Ferroelectric properties of sol-gel delivered epitaxial Pb(Zrx, Ti1−x)O3 thin films on Si using epitaxial γ-Al2O3 Layers, Appl. Phys. Lett., Vol. 86, p.202906–202908, (2005).

DOI: 10.1063/1.1929083

[8] A. Ignatiev, Y. Q. Xu, N. J. Wu, and D. Liu, Pyroelectric Ferroelectric and Dielectric Properties of Mn and Sb-doped PZT Thin Films for Uncooled IR Detectors, Materials Science and Engeering., vol. B56, p.191–194, (1994).

DOI: 10.1016/s0921-5107(98)00220-7

[9] J. G. Wu, J. L. Zhu, D. Q. Xiao, and J.G. Zhu. Double Hysteresis Loop in (Pb0. 90La0. 10)Ti0. 975O3/Pb(Zr0. 20Ti0. 80)O3, Appl. Phys. Lett., vol. 91, pp.212905-1–212905-3, (2007).

DOI: 10.1063/1.2817745

[10] J. W and T. -Y. Zhang, Influence of Depolarization Field on Polarization States in Epitaxial Ferroelectric Thin Films with Nonequally Biaxial Misfit Strains, Phys. Rev.B., vol. 77, pp.014404-1–014104-7, (2008).

DOI: 10.1103/physrevb.77.014104