The site occupation of protons in lithium niobate crystals

✍ Scribed by Y Kong; J Xu; W Zhang; G Zhang

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 163 KB
• Volume: 61
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00413-8

✦ Synopsis

The structural positions of protons in lithium niobate crystals (congruent nominally pure, MgO-doped and MgO and Fe 2 O 3 co-doped LiNbO 3 ) have been determined by 1 H nuclear magnetic resonance measurement. Among various possible oxygen triangle positions, the calculation of second moment based on our experimental results shows that the "rigid" protons substitute Li ϩ ions and locate on the longest O-O bonds (336 pm) within the oxygen triangles nearest to Li-site. According to this conclusion, OH Ϫ absorption bands in highly MgO-doped and Fe 2 O 3 co-doped LiNbO 3 are firstly considered to relate with the stretching vibration of Mg 2ϩ

Nb -OH Ϫ Li and Fe 3ϩ Nb -OH Ϫ Li ; respectively.