EXAFS studies of the local atomic structure of the lead-free piezoelectric ceramics K{sub x}Na{sub 1-x}NbO{sub 3} over the temperature range 10-1023 K
- Institute of Physics at Southern Federal University, 194 Stachky Avenue, Rostov-on-Don 344090 (Russian Federation)
- BM29, European Synchrotron Radiation Facility, Boite Postale 220, F-38043 Grenoble Cedex 9 (France)
- Institut Neel and CNRS Associe a l'Universite Joseph Fourier, Boite Postale 166, F-38042 Grenoble Cedex 9 (France)
We use the x-ray absorption fine structure spectroscopy at Nb K edge to reveal the local atomic structure of K{sub x}Na{sub 1-x}NbO{sub 3} (PSN) solid solutions. The study is performed over the temperature range 10-1023 K for six different x values. We show that only the combined analysis of extended x-ray absorption fine structure and preedge fine structure provides complete and reliable information about the local structure of NbO{sub 6} octahedra. Such extensive treatment of the experimental data shows that the local structure of PSN could be described within the spherical model proposed earlier as a hypothesis for perovskite-type ferroelectric zirconates. We reveal that the Nb atoms are localized near their average positions on the sphere surfaces for all temperatures and x values. With regard to previous results we point out the features of microscopic structure common for PSN and perovskite-type zirconates.
- OSTI ID:
- 21052696
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 13; Other Information: DOI: 10.1103/PhysRevB.76.134106; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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