Characteristics of MgO-doped LiNbO3 crystals

• Published in: Materials letters 1995-06, Vol.24 (1-3), p.157-160
• Main Authors: KIM, I. W, PARK, B. C, JIN, B. M, BHALLA, A. S, KIM, J. W
• Format: Article
• Language: English
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Growth from melts; zone melting and refining; Materials science; Methods of crystal growth; physics of crystal growth; Optical materials; Optics; Other nonlinear optical materials; photorefractive and semiconductor materials; Physics
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/0167-577X(95)00063-1

Congruent MgO:LiNbO3 single crystals doped with 0, 2.5, 5.0, 7.5 and 10.0 mol% of MgO were grown by the Czochralski method. The grown crystals were water clear without any precipitation. Their density and Curie temperature (Tc) were measured. The Curie temperature increased first with the MgO concentration and decreased again when the concentration of MgO went beyond the threshold limit ((Mg)c, 5.0-7.5 mol%). Optical absorption edge and IR absorption spectra were measured at room temperature. The threshold concentration of nearly 6.0 mol% was estimated. The IR absorption peak appeared at 3470 cm-1 in 0-5.0 mol% and at 3534 cm-1 in 7.5-10.0 mol%; the peak shifted about 60 cm-1 towards the shorter wavelength side. 15 refs.