Ultrasonic evidence of temperatures characteristic of relaxors in PbFe2/3W1/3O3–PbTiO3 solid solutions near the morphotropic phase boundary

Autor: A. V. Sotnikov, H. Schmidt, E. P. Smirnova, N. V. Zaitseva, M. Shevelko
Rok vydání: 2020
Předmět:
Zdroj: Journal of Materials Science. 56:4753-4762
ISSN: 1573-4803
0022-2461
DOI: 10.1007/s10853-020-05613-3
Popis: We present an ultrasonic study of relaxor-based solid solution (1−x) PbFe2/3W1/3O3–x PbTiO3 (0.25 ≤ x ≤ 0.35) located within the morphotropic phase boundary (MPB). The longitudinal ultrasonic wave velocity and attenuation have been measured by the ultrasonic pulse-echo technique at a frequency of 10 MHz in a wide temperature range from 200 to 800 K. Attenuation peaks have been observed at characteristic temperatures, namely, at Burns temperature TB and the additional distinctive temperature T*. To explain the experimental results, we consider a modified polar nanoregions (PNRs) model taking into account fluctuation corrections of ultrasonic wave velocity and attenuation in the vicinity of both TB and T*. The obtained results confirm the dynamic nature of MPB effects which determine the physical properties of relaxor-based solid solutions.
Databáze: OpenAIRE
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