| Autor: |
Qadri, Syed B., Bellotti, Jeffrey A., Garzarella, Anthony, Wieting, Terence, Dong Ho Wu, Mahadik, Nadeemullah A. |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 11/27/2006, Vol. 89 Issue 22, p222911, 3p, 4 Graphs |
| Abstrakt: |
Strontium barium niobate has the tungsten-bronze structure with a tetragonal unit cell, and it exhibits negative thermal expansion along the c axis between -120 °C and room temperature while having a positive thermal expansion along the a axis for the same temperature range. At higher temperatures, close to the Curie temperature and above, the negative thermal expansion along the c axis changes to positive thermal expansion. The a axis lattice parameter as a function of temperature shows a change in slope at the Curie temperature. These results indicate the presence of a second-order phase transition near the Curie temperature. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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