Negative correlation between electrical response and domain size in a Ti-composition-gradientPb[(Mg1/3Nb2/3)1−xTix]O3crystal near the morphotropic phase boundary
| Autor: | Kenji Ohwada, Shinya Tsukada, Seiji Kojima, Daisuke Shimizu, Masato Matsuura, Jun'ya Sakamoto, Kazumichi Namikawa, Jun'ichiro Mizuki |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physical Review B. 92 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.92.174121 |
| Popis: | The phase diagram and the relationship between the crystal coherence length and electrical response of ${\mathrm{Pb}[({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3})}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}]{\mathrm{O}}_{3}$ (PMN-$x\mathrm{PT}$) near the morphotropic phase boundary (MPB) have been precisely investigated using a single crystal with a Ti composition gradient by synchrotron x-ray diffraction and inelastic light scattering at room temperature. The crystal has two boundaries at Ti compositions of 29.0 and 34.7 mol% which correspond to the phase boundaries between the monoclinic $B ({M}_{B})$ and $C ({M}_{C})$ phases and between the ${M}_{C}$ and tetragonal $(T)$ phases, respectively. The crystal coherence length determined from the widths of Bragg peaks varies by over two orders of magnitude in a 10 mol% range of the Ti composition. It is shown that there is a strong negative correlation between the electrical response and the crystal coherence length at the sub-$\ensuremath{\mu}\mathrm{m}$ scale. The results are explained by the size effects of domains near the MPB. |
| Databáze: | OpenAIRE |
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