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The Influence of Point Defects on the Vibrational Spectrum
of Li2B4O7 Crystal
1Moiseyenko V.N., 1Dergachov M.P., 2Burak
Ya.V.
1Physics Department, Dnipropetrovsk
National University, 13 Naukova St., 49050 Dnipropetrovsk, Ukraine
2Physical Optics Institute, 23 Dragomanov
St., 79005 Lviv, Ukraine
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The Raman and infrared reflection spectra of Li2B4O7 crystals doped
with potassium, silver and copper ions are measured at 300 K. The damping
increase of the Raman lines and the changes in the oscillator strengths
for a number of reflection bands are observed in the doped crystals. The
results obtained due to theoretical fitting of the spectra are discussed
in the framework of heavy isotopic impurity model. The analysis of the
experimental and theoretical data has allowed to assume that the potassium
and silver ions represent substitution impurities, while the copper ions
are probably the interstitial ones.
Keywords: Raman scattering, infrared reflection, impurity effect
PACS: 78.30.Am
Ukr. J. Phys. Opt. 7 35-40 doi: 10.3116/16091833/7/1/35/2006
Received: 20.12.2005 |
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