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Raman and Infrared Spectra of Nd‐Doped Barium Sodium Niobate Crystals
Author(s) -
Xia H.R.,
Li L.X.,
Yu H.,
Meng X.L.,
Zhu L.,
Hu L.J.
Publication year - 1999
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(199908)34:7<901::aid-crat901>3.0.co;2-f
Subject(s) - raman spectroscopy , tetragonal crystal system , barium , materials science , crystal structure , neodymium , doping , infrared spectroscopy , infrared , lattice constant , crystal (programming language) , tungsten , crystallography , chemistry , optics , diffraction , optoelectronics , laser , programming language , physics , organic chemistry , computer science , metallurgy
Neodymium‐modified barium sodium niobate (Ba 2 Na) 1‐x Nd x Nb 5 O 15 (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.