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EnglishThe temperature evolution of TO1 Raman spectra was investigated in single crystals of K1.xLixTa1-yNbyO3:Cu with different Li and Nh amounts. Auxiliary observations of TO4 spectra were also performed. in a sample with x = 0.002 and y = 0.025 and containing 190 ppm of Cu, the results indicate a clear-cut transition to an ordered phase around 55 K, in good agreement with previous findings from dielectric measurements in the same crystal. However, no evidence was found of a role of Cu in this structural modification. Samples with x = 0.01 and y = 0.003 revealed features of an order-disorder phase transition around 45 K, irrespective of the presence of Cu.
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| Titolo: | Raman study of Cu-doped K-1-xLixTa1-yNbyO3 | |
| Autori: | ||
| Data di pubblicazione: | 2000 | |
| Rivista: | ||
| Abstract: | The temperature evolution of TO1 Raman spectra was investigated in single crystals of K1.xLixTa1-yNbyO3:Cu with different Li and Nh amounts. Auxiliary observations of TO4 spectra were also performed. in a sample with x = 0.002 and y = 0.025 and containing 190 ppm of Cu, the results indicate a clear-cut transition to an ordered phase around 55 K, in good agreement with previous findings from dielectric measurements in the same crystal. However, no evidence was found of a role of Cu in this structural modification. Samples with x = 0.01 and y = 0.003 revealed features of an order-disorder phase transition around 45 K, irrespective of the presence of Cu. | |
| Handle: | http://hdl.handle.net/11571/106842 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11571/106842
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