2006/02/06 by Claire Laulhé, C. Laulhe, F. Hippert +7 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Absorption spectroscopy #Chemistry #Condensed matter physics #Crystallography #Dielectric #Extended X-ray absorption fine structure #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Magnetic and transport properties of perovskites and related materials #Materials science #Multiferroics and related materials #Optics #Physics #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.74.014106
13 pages, 12 figures, 4 tables. Submitted to Phys. Rev. B
arxiv created 2006/02/06 · openalex publication_date 2006/07/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Extended x-ray absorption fine structure experiments at the Zr K edge were carried out on perovskite relaxor ferroelectrics BaTi_1\ensuremath-xZrxO3 (BTZ) (x=0.25,0.30,0.35), and on BaZrO3 for comparison. Structural information up to 4.5\phantom\rule0.3em0ex\mathrm\AA around the Zr atoms is obtained, revealing that the local structure differs notably from the average Pm3m cubic structure deduced from the x-ray diffraction. In particular, our results show that the distance between Zr atoms and their first oxygen neighbors is independent of the Zr substitution rate x and equal to that measured in BaZrO3, while the x-ray cubic cell parameter increases linearly with x. Furthermore, we show that the Zr atoms tend to segregate in Zr-rich regions. We propose that the relaxor behavior in BTZ could be influenced by the random elastic fields generated by this particular chemical arrangement.