Phase transitions in lead-free piezoelectric ceramics: Study of local atomic structure

M. Lemeshko, E. Nazarenko, A. Gonchar, L. Reznichenko, O. Mathon, Y. Joly, R. Vedrinskiǐ, EPL 77 (2007).

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Abstract
Local atomic structure of the piezoelectric ceramics KxNa 1-xNbO3 (x≤0.00, 0.05, 0.30, 0.40, 0.50 and 0.65) is studied in all phase regions (10 K-1023 K) using Nb K-edge extended X-ray absorption fine-structure (EXAFS) spectroscopy. We have shown the validity of a new spherical model for phase transitions on the basis of both fitting of EXAFS signal in the R-space and differential EXAFS analysis. Within this model the Nb atoms are located on the surfaces of small spheres of constant radii surrounding centers of NbO6 octahedrons in all phases. The distribution of the Nb atom on this surface changes during phase transitions. Besides, the analysis of local structure reveals that the geometry of NbO6 octahedra does not depend on the x value at each temperature, whereas the octahedra rotation angles do.
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Date Published
2007-01-11
Journal Title
EPL
Volume
77
Issue
2
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Lemeshko M, Nazarenko E, Gonchar A, et al. Phase transitions in lead-free piezoelectric ceramics: Study of local atomic structure. EPL. 2007;77(2). doi:10.1209/0295-5075/77/26003
Lemeshko, M., Nazarenko, E., Gonchar, A., Reznichenko, L., Mathon, O., Joly, Y., & Vedrinskiǐ, R. (2007). Phase transitions in lead-free piezoelectric ceramics: Study of local atomic structure. EPL, 77(2). https://doi.org/10.1209/0295-5075/77/26003
Lemeshko, Mikhail, Elena Nazarenko, Anastasia Gonchar, Larisa Reznichenko, Olivier Mathon, Yves Joly, and Rostislav Vedrinskiǐ. “Phase Transitions in Lead-Free Piezoelectric Ceramics: Study of Local Atomic Structure.” EPL 77, no. 2 (2007). https://doi.org/10.1209/0295-5075/77/26003 .
M. Lemeshko et al., “Phase transitions in lead-free piezoelectric ceramics: Study of local atomic structure,” EPL, vol. 77, no. 2, 2007.
Lemeshko M, Nazarenko E, Gonchar A, Reznichenko L, Mathon O, Joly Y, Vedrinskiǐ R. 2007. Phase transitions in lead-free piezoelectric ceramics: Study of local atomic structure. EPL. 77(2).
Lemeshko, Mikhail, et al. “Phase Transitions in Lead-Free Piezoelectric Ceramics: Study of Local Atomic Structure.” EPL, vol. 77, no. 2, IOP Publishing Ltd., 2007, doi:10.1209/0295-5075/77/26003 .

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