Temperature-dependent volume fraction of polar nanoregions in lead-free (1−x)(Bi0.5Na0.5)TiO3−xBaTiO3 ceramics
| Autor: | Jürgen Rödel, Florian H. Schader, Malte Vögler, Nikola Novak |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Highly sensitive Crystallography visual_art 0103 physical sciences Volume fraction visual_art.visual_art_medium Polar Ceramic 0210 nano-technology Relaxor ferroelectric Burns temperature |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.024104 |
| Popis: | The formation and temperature evolution of polar nanoregions (PNRs) in relaxor ferroelectrics is an intriguing issue that is still under debate. Therefore, we present an approach to estimate the volume fraction of PNRs by the example of the relaxor ferroelectric, $(1\ensuremath{-}x)(\mathrm{B}{\mathrm{i}}_{0.5}\mathrm{N}{\mathrm{a}}_{0.5})\mathrm{Ti}{\mathrm{O}}_{3}\ensuremath{-}x\mathrm{BaTi}{\mathrm{O}}_{3}$ (BNT-$x\mathrm{BT}$). A detailed analysis of the Young's modulus, which is highly sensitive to small structural distortions, at temperatures $25{\phantom{\rule{0.16em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}l\phantom{\rule{4pt}{0ex}}Tl800{\phantom{\rule{0.16em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}$ for both poled and unpoled samples, is correlated to the temperature evolution of PNRs by utilizing a composite model. The extracted volume fraction of the PNRs and the increasing Young's modulus above the formerly suggested Burns temperature indicate that the formation of the PNRs does not occur at a defined temperature but rather in a broad temperature range starting around $\ensuremath{\sim}720{\phantom{\rule{0.16em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}$. |
| Databáze: | OpenAIRE |
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