Raman scattering investigation of disorder and of hydrogen bonds versus temperature in sodium 4-nitrophenolate dihydrate (NPNa)

Constantin Carabatos-Nedelec; Mohammed Ben Salah; Paul Becker

doi:10.1117/12.401641

29 September 2000 Raman scattering investigation of disorder and of hydrogen bonds versus temperature in sodium 4-nitrophenolate dihydrate (NPNa)

Constantin Carabatos-Nedelec, Mohammed Ben Salah, Paul Becker

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Proceedings Volume 4098, Optical Devices and Diagnostics in Materials Science; (2000) https://doi.org/10.1117/12.401641
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Sodium 4-Nitrophenolate dihydrate (NPNa), an optically highly non-linear material, has been synthesized in methanol in form of 6 X 9 X 6 mm³ transparent single crystals. X-rays precession measurements confirmed the values of the unit cell parameters of symmetry Ima2 equals C²²_2v. Polarized Raman scattering experiments have been performed, as a function of temperature, between 10 and 300 K in a wide spectral range. We present the results in the low wavenumber region [10 - 200] cm^-1 in which we studied in detail four peaks: 57, 55, 178 and 189 cm^-1 at 20 K. The two former are lattice modes, the two latter are hydrogen bond vibrations corresponding to two different O...O distances, 2,00 angstroms and 2.789 angstroms respectively. In addition, a relaxor behavior has been observed and analyzed in relation with a possible disorder in the substance. The analysis of the behavior versus temperature of the wavevector, damping and intensity of the three vibrational modes provide new results with respect to the dynamical properties of the substance, compared to its structure.

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Constantin Carabatos-Nedelec, Mohammed Ben Salah, and Paul Becker "Raman scattering investigation of disorder and of hydrogen bonds versus temperature in sodium 4-nitrophenolate dihydrate (NPNa)", Proc. SPIE 4098, Optical Devices and Diagnostics in Materials Science, (29 September 2000); https://doi.org/10.1117/12.401641

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