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- W2032138870 abstract "The Raman scattering technique was applied to examine the soft optical phonon of the Ba 0.32 Sr 0.68 Nb 2 O 7 in the temperature range from 26 to 1100 °C. The line shape of Raman spectra can be well fitted by multidamped-harmonic oscillator model. Two soft optical phonons were observed at 43.1, 52.4 cm -1 at room temperature. Both modes show softening approaching their corresponding phase transition temperature. It is found that damping factor y of the lowest soft optical mode increases, while frequency of this mode decreases rapidly with temperature. Near T c , the soft mode becomes over damped (γ/ω > 1 ). The soft mode frequency related to the order parameter of this ferroelectric phase shows a non-classical behavior, and the critical exponent connected to the increase of the order parameters obtained as β= 0.377. From the relation of soft mode frequency with temperature, the ferroelectric phase transition temperature T c was estimated to be 1058 °C." @default.
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- W2032138870 date "2004-01-01" @default.
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- W2032138870 title "Soft optical phonon in Ba-doped Sr2Nb2O7 ceramics" @default.
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- W2032138870 doi "https://doi.org/10.1016/j.ceramint.2003.12.166" @default.
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