Ukrainian Journal of Physical Optics 

Number  3, Volume 7,  2006

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Raman Scattering in Ionic Conducting Li2B4O7 Crystals at High Temperatures
1Moiseyenko V.N., 1Dergachov M.P., 2Burak Ya.V.

1Physics Department, Dniepropetrovsk National University, 13 Naukova St., 49050 Dniepropetrovsk, Ukraine
2Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

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Raman spectra of isotopically substituted Li2B4O7 (LB4) crystals have been measured within a wide temperature region (290–1040 K). Temperature dependences of the parameters of vibrational modes with participation of lithium ion have been analyzed. The character of temperature dependences of the frequency and the damping constant of these modes testifies disordering of lithium sublattice and a possibility of order-disorder phase transition in the vicinity of 750 K. Resonant and anharmonic interaction effects have been found to determine spectral intensity distribution in the Raman spectra of LB4 crystals at high temperatures. The possibility of appearance of lithium plasmon vibration in the Raman spectra has been discussed.

Key words: Raman scattering, phase transitions, ionic conductor

PACS: 78.30.-j, 63.20.–e, 64.60.Cn

doi 10.3116/16091833/7/3/100/2006

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