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Lattice vibrations and phase-transition soft mode in near stoichiometric lithium niobate crystals
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10.1063/1.1999830
/content/aip/journal/jap/98/3/10.1063/1.1999830
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.1999830

Figures

Image of FIG. 1.
FIG. 1.

Raman spectra of the holohedral symmetry (a) and symmetry species and (b), including Raman tensor elements , , , , , and , recorded in from at room temperature.

Image of FIG. 2.
FIG. 2.

IR transmissivity of from at room temperature.

Image of FIG. 3.
FIG. 3.

High-temperature Raman spectra of the Raman tensor element , recorded in from at .

Image of FIG. 4.
FIG. 4.

High-temperature Raman spectra of the Raman tensor element , recorded in from at .

Image of FIG. 5.
FIG. 5.

Linewidth measurements at 153- and (inset) peaks.

Image of FIG. 6.
FIG. 6.

Six curves of the absorption coefficient vs wavelength from , measured by using the plane where the six positions are selected randomly. If the reflection is considered, the equation of the absorption coefficient is corrected as (Ref. 44) , where , is the thickness of the sample along the light propagation direction, the transmissivity, and the reflectance.

Image of FIG. 7.
FIG. 7.

The - and -direction transmissivity curves of the congruent LN sample, collected from (inset, from ).

Tables

Generic image for table
Table I.

Raman and IR phonon frequency measured in the crystals. The superscripts , , and of the mode represent its splitting.

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/content/aip/journal/jap/98/3/10.1063/1.1999830
2005-08-05
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lattice vibrations and phase-transition soft mode in near stoichiometric lithium niobate crystals
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.1999830
10.1063/1.1999830
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