Raman scattering structural studies of nonlinear optical M(IO₃)₃(M = Fe, Ga, α-In) and linear optical β-In(IO₃)₃

Abstract

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Rubidium Cerium (IV) Iodates with High UV‐Light‐Driven Photocatalytic Efficiency

“…More significantly, the strongest band at 694 cm À 1 corresponds to the symmetric stretching v 1; another group of three bands at 756,783 and 802 cm À 1 also belong to v 1 ; the band at 405 cm À 1 is attributed to the symmetric bending v 2 ; the band at 826 cm À 1 belongs to asymmetric stretching v 3 . [31] As depicted in Figure 4, UV/Vis-NIR diffuse reflectance spectra of RbCeI 5 O 15 ⋅H 2 O show that its absorption edge is at 449.74 nm, corresponding to a band gap of 2.76 eV. This is in agreement to the wheat colour of the crystal.…”

“…As documented in Figure , evident I−O vibration was observed between 400 and 900 cm −1 . More significantly, the strongest band at 694 cm −1 corresponds to the symmetric stretching v 1; another group of three bands at 756,783 and 802 cm −1 also belong to v 1 ; the band at 405 cm −1 is attributed to the symmetric bending v 2 ; the band at 826 cm −1 belongs to asymmetric stretching v 3 …”

“…The Raman spectra of RbCeI 5 O 15 ⋅H 2 O is shown in Figure , three bands at 838, 823 and 813 cm −1 correspond to asymmetric stretching v 3 of [IO 3 ]; six bands at 781, 758, 730, 715, 698 and 678 cm −1 belong to the symmetric stretching v 1 of [IO 3 ], while the band at 776 cm −1 is assigned to the doubly degenerate [IO 3 ] antisymmetric stretching; three bands at 420, 403 and 393 cm −1 come from the symmetric bending v 2 of [IO 3 ]; four bands at 361, 326, 315 and 250 cm −1 derive from the asymmetric bending v 4 of [IO 3 ]; other bands at 190, 172, 152, 125, and 115 cm −1 belong to the lattice modes …”

“…The two compounds share common features as shown in [31][32][33][34] The infrared spectrum of RbCeI 5 O 15 ⋅H 2 O discloses the rotation and vibration of its structure components. As documented in Figure 3, evident IÀ O vibration was observed between 400 and 900 cm À 1 .…”

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

“…For instance, lithium iodate (LiIO 3 ) has been widely used as a piezoelectric, acousto-optic, and second-harmonic generation (SHG) material [9]. However, LiIO 3 crystals occasionally have OH inclusions which reduce their transparency in the infrared (IR) region, affecting their performance [10]. In addition, their properties are known to strongly depend on the growth conditions [11].…”