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- W1996043478 abstract "High-pressure Raman scattering and luminescence studies of ${mathrm{Bi}}_{2}mathrm{W}{mathrm{O}}_{6}:{mathrm{Eu}}^{3+}$, which is a member of the bismuth layered Aurivillius family of ferroelectrics, are presented. These studies showed the onset of two reversible second order phase transitions near 3.4 and $6.2phantom{rule{0.3em}{0ex}}mathrm{GPa}$. The pressure dependence of Raman bands provides strong evidence that the first phase transition involves the loss of the $mathrm{W}{mathrm{O}}_{6}$ tilt mode around the pseudotetragonal axis. This structural change may be the same as that observed at ambient pressure at $660phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$ (from the $Pca{2}_{1}$ to $B2cb$ structure). The second phase transition is associated with the instability of a low wave number mode, which behaves as soft mode. The discovery of the soft mode in ${mathrm{Bi}}_{2}mathrm{W}{mathrm{O}}_{6}$ that corresponds most likely to the ${E}_{u}$ mode responsible for ferroelectricity in Aurivillius family of compounds proves that this transition is of displacive type. Our studies also suggest that the structure above $6.2phantom{rule{0.3em}{0ex}}mathrm{GPa}$ is orthorhombic and centrosymmetric and, consequently, the phase transition can be classified as a pressure-induced ferroelectric to a paraelectric phase transition." @default.
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- W1996043478 date "2008-03-31" @default.
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- W1996043478 title "Phonon-instability-driven phase transitions in ferroelectric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>W</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:mo>:</mml:mo><mml:msup><mml:mi mathvariant=normal>Eu</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math…" @default.
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- W1996043478 doi "https://doi.org/10.1103/physrevb.77.094137" @default.
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