Funct. Mater. 2013; 20 (1): 75-80.
Phase transitions in the nanopowders KTa0.5Nb0.5O3 studied by Raman spectroscopy
[1]Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 41 Nauki Ave., 03028 Kyiv, Ukraine
[2]Quality Engineering Education, Inc., Buffalo Grove, IL 60089, USA
Raman spectra of KTa0.5Nb0.5O3 nanopowder solid solution were obtained at the temperatures from –190°C to 600°C and investigated for the first time. The compound was synthesized by a new technology. Temperature dependences of the intensity, width and frequency of the B1(TO2), A1(TO1), B1(TO3), A1(TO3) and B2(TO3) modes are thoroughly analyzed. A significant expanding of the temperature ranges of all phase transitions, correlated with a spread of particle sizes is registered. It was found that an average temperature of each of the phase transitions is shifted in different way, in particular: a low-temperature transition at 30 degrees higher, the middle transition at 10 degrees higher, and the ferroelectric phase transition occurs at 20 degrees lower than the temperature of the corresponding transitions in single-crystal KTa0.5Nb0.5O3.
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