Temperature dependent XAFS studies of local atomic structure of the perovskite-type zirconates

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788039

Vedrinskii, R V; Lemeshko, M P; Novakovich, A A ^[1]; Nazarenko, E S ^[1]; Nassif, V ^[2]; Proux, O ^[3]; Joly, Y ^[4]

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1. Institute of Physics, Rostov State University, 194 Stachky Avenue, Rostov-on-Don 344090 (Russian Federation)
2. CEA/Grenoble, DRFMC/SP2M/NRS, F-38054 Grenoble Cedex 9 (France)
3. Laboratoire de Geophysique Interne et Tectonophysique, UMR CNRS, Universite Joseph Fourier, F-38400 Saint-Martin-D'Heres (France)
4. Laboratoire de Cristallographie, CNRS, l'Universite Joseph Fourier, 166 Boite Postale, F-38042 Grenoble Cedex 9 (France)

Temperature dependent preedge and extended x-ray absorption fine structure measurements at the Zr K edge for the perovskite-type zirconates PbZr{sub 0.515}Ti{sub 0.485}O{sub 3} (PZT), PbZrO{sub 3} (PZ), and BaZrO{sub 3} are performed. To carry out a more accurate study of the weak reconstruction of the local atomic structure we employed a combination of two techniques: (i) analysis of the preedge fine structure, and (ii) analysis of the Fourier transform of the difference between {chi}(k) functions obtained at different temperatures. A detailed investigation of local atomic structure in the cubic phase for all the crystals is also performed. It is shown that neither the displacive nor the order-disorder model can describe correctly the changes of local atomic structure during phase transitions in PZ and PZT. A spherical model describing the local atomic structure of perovskite-type crystals suffering structural phase transitions is proposed.

• OSTI ID: 20788039
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 13; Other Information: DOI: 10.1103/PhysRevB.73.134109; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
BARIUM COMPOUNDS
CERAMICS
CRYSTALS
FERROELECTRIC MATERIALS
FINE STRUCTURE
FOURIER TRANSFORMATION
ORDER-DISORDER MODEL
ORDER-DISORDER TRANSFORMATIONS
PEROVSKITE
PZT
SPHERICAL MODEL
TEMPERATURE DEPENDENCE
X RADIATION
X-RAY SPECTROSCOPY