Ferroelectric and Pyroelectric Properties of Nano Graded Ferroelectric Films

Abstract:

In order to improve the properties of nano graded ferroelectric films (NGFF), the generalized Ginzburg-Landau-Denvonshire (GLD) theory is used to investigate the ferroelectric and pyroelectric properties of NGFF. A function is introduced to describe the local structure of this graded film. The numerical results show that parameter and film thickness are two very important factors that influence the ferroelectric and pyroelectric properties of films, larger values lead to smaller spontaneous polarization and lower pyroelectric peak Local structure in NGFF leads to flatten the polarization distribution, which raises the spontaneous polarization of components with lower transition temperature, but reduces spontaneous polarization of components with higher transition temperature.

• Periodical: Advanced Materials Research (Volumes 403-408)
• Pages: 1077-1082
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.403-408.1077
• Online since: November 2011
• Authors: Hui Chen, Tai Min Cheng
• Keywords: Curie Temperature, Ferroelectric Film, Polarization, Pyroelectric Coefficient

References

[1] 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

[2] 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

[3] 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

[4] M. S. Mohammed, G. W. Auner, and R. Naik. Temperature Dependence of Conventional Pyroelectric Coefficients for Compositionally Graded BaxSr1-xTiO3 Films, J. Appl. Phy., vol. 84, p.3322–3325, (1998).

DOI: 10.1063/1.368516

[5] W. G. Liu, B. Jiang, and W. G. Zhu, Self-biased Dielectric Bolometer from Epitaxially Grown Pb(Zr, Ti)O3, and Lanthanum-doped Pb(Zr, Ti)O3 Multilayered Thin Films, Appl. Phys. Lett, vol. 77, p.1047–1049, (2000).

DOI: 10.1063/1.1289064

[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] S. Zhong, S.P. Alpay and Z. -G. Ban. Effective Pyroelectric Response of Compositionally Graded Ferroelectric Materials, Appl. Phys. Lett., vol. 86, pp.092903-1–092903-3, (2005).

DOI: 10.1063/1.1866505

[8] J. Funfschillimg, The Electrooptic Responsibility of Liquid Crystals, Condensed Matter News, vol. 1(1), p.12–16, (1991).