Optical Anomalies in LiNbO3:Mg Crystals


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Аннотация

We have observed that LiNbO3:Mg (0.19–5.91 mol % MgO) crystals experience rearrangements in their defect structure with increasing concentration of Mg and exhibit optical anomalies related with them, which have a threshold character. We have shown that, at Mg concentrations close to the first concentration threshold at ~3.0 mol % MgO, the optical homogeneity of the crystals increases. When the Mg concentration approaches the second concentration threshold, we have revealed a significant shift (by ~50 cm–1 compared to that in other crystals) of the entire IR absorption spectrum in the range of stretching vibrations of OH groups to the high-frequency range, a sharp decrease in the number of protons, and a jumpwise shift of the absorption edge in the short-wavelength range. We have shown that the shift occurs because all NbLi point defects are replaced by Mg cations near the concentration threshold at 5.5 mol % MgO, and, subsequently, Mg cations occupy only positions of Li and Nb cations of an ideal stoichiometric structure, forming MgLi and MgNb point defects.

Авторлар туралы

N. Sidorov

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center

Email: tepl_na@chemy.kolasc.net.ru
Ресей, Apatity, Murmansk oblast, 184209

L. Bobreva

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center

Email: tepl_na@chemy.kolasc.net.ru
Ресей, Apatity, Murmansk oblast, 184209

N. Teplyakova

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center

Хат алмасуға жауапты Автор.
Email: tepl_na@chemy.kolasc.net.ru
Ресей, Apatity, Murmansk oblast, 184209

M. Palatnikov

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center

Email: tepl_na@chemy.kolasc.net.ru
Ресей, Apatity, Murmansk oblast, 184209

O. Makarova

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center

Email: tepl_na@chemy.kolasc.net.ru
Ресей, Apatity, Murmansk oblast, 184209

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