Manifestation of metastable gamma-TeO2 phase in the Raman spectrum of crystals grown in synthetic opal pores

Abstract

Abstract. 'Opal-tellurium dioxide' nanocomposite has been obtained by filling opal pores with a melt of fine dispersive polycrystalline α-TeO 2 powder. The Raman spectrum of the composite has been measured in the region of 50-1100 cm -1 and compared with the spectra peculiar for polycrystalline α-TeO 2 powder and the corresponding single crystals. Besides of the Raman bands corresponding to α-TeO 2 lattice vibrations, other bands have been detected in the spectrum of the composite. Their spectral positions coincide fairly well with those available in the spectrum of γ-TeO 2 .

Structure and Characteristics of Opal - Bi₁₂GeO₂₀ and Opal - NaBi(MoO₄)₂ Nanocrystalline Composites

“…These are, first of all, the nanoscale size of the crystallization area restricted by the pore volume, the strengthening of the role of the surface and the presence of a large number of crystallization centers due to the mesoporous structure of silica particles [12]. Our earlier results indicate both formation of new crystalline phase of tellurium dioxide, metastable γ-phase [13], and new component, bismuth orthosilicate Bi4Si3O12, when opals are impregnated with either bismuth silicate Bi12SiO20 [14] or bismuth tellurite Bi2TeO5 [15].…”

Cerium (IV) oxide reinforced Lithium-Borotellurite glasses: A characterization study through physical, optical, structural and radiation shielding properties

“…Nine different bands were obtained under the observed regions in the Raman spectra as a result of the deconvolution process. Accordingly, the band found between the 128-134 cm − 1 was linked to the γ-TeO 2 formation and this band was seen in TeO 2 -rich glass structures in the literature [38,39]. Furthermore, compared to the band areas formed in this region, the sample with the maximum γ-TeO 2 formation was TBLC20.…”

Synthesis and Structural Properties of Nanocomposites Based on Synthetic Opals and Active Dielectrics

“…Figure 5. Raman spectra of α-TeO 2 polycrystalline powder (1) and TeO 2 crystals in pores of synthetic opal (2) (Abu et al, 2013).The spectra are correspondent to the same quantity of tellurium dioxide in the excitation volume. (Derhachov et al, 2019).…”

“…Insufficient experimental material makes it difficult to develop the physics of composites with nanostructured inorganic and organic substances. This work is aimed to analyze previous obtained results of new matrix nanocomposites based on synthetic opals and active dielectrics (Abu et al, 2013;Derhachov et al, 2018;Derhachov et al, 2019;Moiseienko et al, 2016;Moiseienko et al, 2016; in order to identify the most common structure patterns formed due to various infiltrated materials. , where θ angle of incidence of light on a system of (111) planes,…”