Studies of absorption spectra and the photovoltaic effect in LiNbO3:Mg:Fe crystals

✍ Scribed by Huixian Feng; Jinke Wen; Hong Wang; Huafu Wang

• Publisher: Springer
• Year: 1990
• Tongue: English
• Weight: 427 KB
• Volume: 51
• Category: Article
• ISSN: 1432-0630
• DOI: 10.1007/bf00348379

✦ Synopsis

The absorption spectra, photoconductivities and photovoltaic currents of LiNbO 3 : Fe crystals with different Mg doping levels and Li/Nb ratios in the oxidized state have been investigated at room temperature. The Fe 2 ÷ ions in LiNbO3 : Mg: Fe with Mg content above a critical value are more easily oxidized than in crystals with Mg content below a critical value. The photoconductivity of LiNbO3 : Mg : Fe crystals with Mg content above a critical value is one order of magnitude higher than those with Mg content below a critical value, however, the photovoltaic current of the former is one order of magnitude lower than the latter. The differences are postulated to be due to different sites of Fe in these two classes of crystals.