Crystal Research and Technology
Cryst. Res. Technol. 34 (1999) 901 - Abstract -

H.-R. Xia, L.-X. Li*, H. Yu*, X.-L. Meng, L. Zhu, L.-J. Hu

Department of Physics and State Key Laboratory of Crystal Materials, (*Experimental Center), Shandong University, Jinan 250100, People's Republic of China

Raman and Infrared Spectra of Nd-Doped Barium Sodium Niobate Crystals

Neodymium-modified barium sodium niobate (Ba2Na)1-xNdxNb5O15(BNN:Nd), with x = 0.025, crystallizes with a filled tungsten bronze (TB) type structure in the tetragonal system, conforming to the space group P4bm and Z = 2. The lattice constants are a = 1.2446(1) and c = 0.3991(1) nm at room temperature. Tc = 537 +- 2 °C. The experiments show that the Nd-ions effectively improve crystal structural quality. The lattice vibrational spectrum, studied by Raman and infrared reflectivity spectroscopy, shows that the crystal microscopic structure and lattice dynamics, thereby the microstrain and microstress, are very stable in a temperature range from 22 to approaching 500 °C.

Keywords: raman spectra, infrared spectra


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