Brillouin scattering study of orthorhombic LiNiPO4 single crystal

• Published in: Physica status solidi. A, Applications and materials science Applications and materials science, 2006-12, Vol.203 (15), p.3805-3815
• Main Authors: Kurnosov, V. S., Peschanskii, A. V., Fomin, V. I., Yeremenko, A. V.
• Format: Article
• Language: English
• Subjects: 62.20.Dc; 78.35.+c; Brillouin and rayleigh scattering; other light scattering; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Elasticity, elastic constants; Exact sciences and technology; Magnetic properties and materials; Magnetomechanical and magnetoelectric effects, magnetostriction; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Physics
• ISSN: 1862-6300; 0031-8965; 1862-6319
• DOI: 10.1002/pssa.200622346

Elastic moduli of LiNiPO4 linear magnetoelectric single crystal were determined using Brillouin light scattering measurements at room temperature. The obtained values of the elastic moduli are the following: c 11 = 189.6 ± 0.2, c 22 = 192.6 ± 0.4, c 33 = 229.6 ± 0.2, c 44 = 58.9 ± 0.5, c 55 = 70.4 ± 0.6, c 66 = 75.7 ± 0.5, c 12 = 71.4 ± 0.9, c 13 = 71.0 ± 0.8, and c 23 = 54.5 ± 0.9 in units of 1010 dyn/cm2. Determination of refractive indices at a He–Ne laser wavelength of 632.8 nm was also carried out by means of measurements of Brewster angle, and the following values were obtained: na = 1.713 ± 0.003, nb = 1.698 ± 0.005, and nc = 1.709 ± 0.006. The estimation of the crystal Debye temperature θ D = 645 K was made using elastic constant values. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)