Polarized Raman and IR spectra of non‐centrosymmetric PbB₄O₇ single crystal

Abstract

Polarized Raman and IR spectra of a PbB 4 O 7 single crystal were measured. The obtained spectra are discussed within the factor group approach for the orthorhombic P2 1 nm .C 2v 7 / space group with Z = 2 assuming that the crystal structure is built up of the (B 4 O 7 ) ∞ 2− framework and Pb 2+ ions. It has been shown that vibrations of borate and Pb 2+ units are observed above 240 and below 160 cm −1 , respectively. The results obtained for the spontaneous Raman scattering have also been used in the discussion of the stimulated Raman spectra of the material studied -a new Raman-laser crystal. The obtained results revealed that mainly translational motions of Pb 2+ ions participate efficiently in the SRS effect.

Recent advances in linear and nonlinear Raman spectroscopy. Part V

“…reported on the vibrational properties of mirabilite, Na 2 SO 4 ‐10H 2 O and the rediscovered metastable heptahydrate, Na 2 SO 4 ‐7H 2 O . Polarized IR and Raman spectra of Na 3 Li(MoO 4 ) 2 ‐6H 2 O single crystal were measured by Hanuza and coworkers . The results for the spontaneous Raman scattering were used in the analysis of the stimulated Raman spectra of the material studied – a new Raman laser crystal.…”

Symmetries of modes in Ni3V2O8: Polarized Raman spectroscopy and ab initio phonon calculations

“…Information about the symmetry of the modes is essential for understanding any phonon‐assisted phenomena such as structural transitions involving phonon softening or spin‐phonon coupling. Even origin of stimulated Raman scattering in PbB 4 O 7 is identified by a polarization‐dependent studies on single crystals . In the series RCrO 3 (R = La, Pr, Nd, and Sm), evolution of phonon wavenumber as a function of orthorhombic distortion and mode‐mixing behaviour was understood using assignment of vibrational modes by polarized Raman study.…”

“…Even origin of stimulated Raman scattering in PbB 4 O 7 is identified by a polarization-dependent studies on single crystals. [9] In the series RCrO 3 (R = La, Pr, Nd, and Sm), [10] evolution of phonon wavenumber as a function of orthorhombic distortion and mode-mixing behaviour was understood using assignment of vibrational modes by polarized Raman study. A detailed Raman and FTIR investigations on Na 2 Ti 3 O 7 enabled assignments of all the vibrational modes, which is useful for technological applications of the compound.…”

Recent advances in linear and non‐linear Raman spectroscopy. Part III

“…[146] Makreski and Jovanok [147] studied the mineral almandine originating from Macedonia and Ishibashi et al [148] reported on the relationship between the Raman spectral pattern and the crystallographic orientation of a rock-forming mineral Fo 89 Fa 11 olivine. Polarised Raman and IR spectra of non-centrosymmetric PbB 4 O 7 single crystals were investigated by Hanuza et al [149] Maczka et al [150] performed temperature-dependent Raman scattering studies of the geometrically frustrated pyrochlores Dy 2 Ti 2 O 7 , Gd 2 Ti 2 O 7 and Er 2 Ti 2 O 7 . Other temperature-dependent Raman scattering studies were carried out by Saraiva et al [151] on the Na 2 MoO 4 crystal and by Chiang et al [152] on iron perchlorate hexahydrate (Fe(ClO 4 ) 2 · 6H 2 O).…”