Raman spectra and elastic properties of KPb ₂ Cl ₅ crystals

Abstract

Raman scattering spectra and elastic constants of KPb 2 Cl 5 crystals have been studied. The results obtained are interpreted in terms of the ab initio lattice dynamics model taking into account multipole moments of ionic electron envelopes. The experimental results have been found to be in good agreement with numerical simulation; the narrow phonon spectra are shown to be due to a considerable contribution of heavy cations into the eigenvectors of the higher frequency lattice modes.

Rare-Earth-Doped Low Phonon Energy Halide Crystals for Mid-Infrared Laser Sources

“…Table 1. Laser-related crystallographic, thermal, mechanical, optical and spectroscopical properties of selected low phonon energy halide crystals [Aleksandrov et al, 2005;Atuchin et al, 2011;Cockroft et al, 1992;Doualan & Moncorgé, 2003;Ferrier et al, 2006aFerrier et al, , 2007Ferrier et al, , 2008aFerrier et al, , 2008bFerrier et al, , 2009aFerrier et al, , 2009bHeber et al, 2001;Isaenko et al, 2008Isaenko et al, , 2009aIsaenko et al, , 2009bMalkin et al, 2001;Mel'nikova et al, 2005;Merkulov et al, 2005;Neukum et al, 1994;Nostrand et al, 2001;Okhrimchuk et al, 2006;Popova et al, 2001;Quagliano et al, 1996;Ren et al, 2003;Singh et al, 2005;Velázquez et al, 2006aVelázquez et al, , 2006bVirey et al, 1998;Vtyurin et al, 2004Vtyurin et al, , 2006. (*) per lead type of crystallographic site.…”

Growth and optical spectroscopy of KPb2Cl5 crystal containing Mn2+

“…According to the Raman scattering spectra, the maximum phonon energy of the KPb 2 Cl 5 lattice is only ∼202 cm −1 so that the multiphonon relaxation rates are low [1]. This crystal has a broad transparency in the spectral range from 0.3 to 22 m [2].…”

“…The X-ray single crystal diffraction analysis of KPb 2 Cl 5 shows that there are two distinct Pb 2+ sites, Pb(1) and Pb(2), each having a C 1 site symmetry. Pb (1) and Pb(2) coordinate with six and seven chloride atoms, respectively (Fig. 1b).…”

Crystal growth and spectral analysis of Dy3+ and Er3+ doped KPb2Cl5 as a mid‐infrared laser crystal

“…The KPb 2 Cl 5 crystal belongs to monoclinic system with space group P2 1 /c, the lattice parameters a=8.854Å, b=7.927Å, c=12.485Å, and β=90.05°, V=876.3 Å 3 [5]. Its refractive index was measured to be 2.016±0.005 [2].…”