Infrared spectra and second-harmonic generation in barium strontium titanate and lead zirconate-titanate thin films: "Polaron" artifacts

被引：24

作者：

Scott, JF ^{[1
]}

Jiang, AQ ^{[1
]}

Redfern, SAT ^{[1
]}

Zhang, M ^{[1
]}

Dawber, M ^{[1
]}

机构：

[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

来源：

JOURNAL OF APPLIED PHYSICS | 2003年 / 94卷 / 05期

关键词：

D O I：

10.1063/1.1596715

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report infrared absorption spectroscopy and second-harmonic generation data for barium strontium titanate (BST) and lead zirconate-titanate (PZT) ceramic films in the 3000-5500 cm(-1) region. Second-harmonic generation experiments give temperature dependences in accord with oxygen vacancy cluster theory [S. A. Prosandeev, Sov. Phys. JETP 83, 747 (1996); S. A. Prosandeev, V. S. Vikhnin, and S. Kapphan, Integr. Ferroelectr. 32, 1047 (2001); J. Phys. Condens. Matter 14, 4407 (2002)]. A percolation model of vacancy ordering is discussed. The present work shows that earlier data interpreted as polaron spectra in these films were actually artifacts due to interference in the optical apparatus used [B. Guettler, U. Bismayer, P. Groves, and E. Salje, Semicond. Sci. Technol. 10, 245 (1950]; more recent "polaron" spectra in WO3 films may also be artifacts [L. Berggren, A. Azens, and G. A. Niklassson, J. Appl. Phys. 90, 1860 (2001)]. Numerical estimates of the polaron mass m**=16 m(e) in SrTiO3 and BST help prove that dielectric data in strontium titanate interpreted as bipolarons [A. Levstik et al., Appl. Phys. Lett. 81, 4046 (2002)] are also artifacts. (C) 2003 American Institute of Physics.

引用

页码：3333 / 3344

页数：12

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