| Autor: |
Golovina, I. S., Bryksa, V. P., Strelchuk, V. V., Geifman, I. N., Andriiko, A. A. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Apr2013, Vol. 113 Issue 14, p144103, 5p, 1 Black and White Photograph, 6 Graphs |
| Abstrakt: |
The paper reports on thorough Raman-scattering study of newly synthesized nanoscale powders of potassium niobate (KNbO3) aimed at evaluating the possible modification of the phase transition temperatures versus the corresponding bulk values. We register a significant expansion of the temperature ranges of all phase transitions, which is attributed to a wide distribution of particle sizes. An average temperature of each phase transition shifts to the high-temperature region differently, namely by 10°, 25°, and 40°, as compared with corresponding transition temperature in bulk crystals of KNbO3 and amounts 0, 248, and 475 °C, respectively. In the range from 100 to 110 °C, we also find the features, which could be associated with an additional rearrangement of the structure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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