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| 100 | 1 | _ | |a Rösche, Constanze Maria |0 P:(DE-H253)PIP1092488 |b 0 |e Corresponding author |u desy |
| 245 | _ | _ | |a Structural transformations in the (1−$x$)Na$_{0.5}$Bi$_{0.5}$TiO$_3$− $x$BaTiO$_3$ solid solution under high pressure: Comparison between x below and above the morphotropic phase boundary |
| 260 | _ | _ | |a Woodbury, NY |c 2025 |b Inst. |
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| 520 | _ | _ | |a Single crystals of (1-$x$)Na$_{0.5}$Bi$_{0.5}$TiO$_3$-$x$BaTiO$_3$ (NBT-$x$BT) with a composition below ($x=0.013$) and above ($x=0.074$) the morphotropic phase boundary (MPB) were studied by $in situ$ high-pressure x-ray diffraction with synchrotron radiation and Raman spectroscopy. We show that both compounds undergo a reversible pressure-induced phase transition to structures with $Pnma$ symmetry, regardless of their symmetry at ambient conditions. The high-pressure phase resembles that recently reported for $x_{\rm{MPB}}=0.048$, as the critical pressure $p_{\rm c}$ gradually increases with $x$. However, the pathway of developing the high-pressure phase varies with the composition, revealing distinct ways of Ba incorporation into the NBT matrix for the pseudorhombohedral ($x=0.013$) and tetragonal ($x=0.074$) phases. For $x$<$x_{\rm{MPB}}$ the Ba$^{2+}$ cations are preferentially accommodated in the tetragonal-type nanodomains existing in the dominant pseudorhombohedral NBT matrix, whereas for $x>x_{\rm{MPB}}$ Ba$^{2+}$ is dispersed in both the rhombohedral nanodomains and the dominant tetragonal matrix. Furthermore, for $x=0.074$ there are incommensurate structural modulations at ambient pressure, which up to $p_c$ remain unaffected by pressure, but vanish above $p_c$. |
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| 700 | 1 | _ | |a Malcherek, Thomas |0 P:(DE-H253)PIP1006737 |b 1 |
| 700 | 1 | _ | |a Ballaran, Tiziana Boffa |0 0000-0002-4567-8961 |b 2 |
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| 773 | _ | _ | |a 10.1103/p74j-3j8p |g Vol. 112, no. 18, p. 184102 |0 PERI:(DE-600)2844160-6 |n 18 |p 184102 |t Physical review / B |v 112 |y 2025 |x 2469-9950 |
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