The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

Abstract

Combined optical and FTIR were measured for binary bismuth borate glass together with samples containing 2.5 -15 mol % Bi 2 O 3 glasses to justify the role of bismuth (Bi 3+ ) ions on the spectral properties. The density and molar volume values were calculated to obtain some insight on the compactness and structural arrangement in the network. DTA measurements were carried out to calculate the thermal transition parameters of the studied glasses and to justify their stability. Optical spectra reveal three strong UV-near visible absorption bands at 250, 275 and 310 nm due to collective absorption of trace iron (Fe 3+ ) ions impurities together with absorption from Bi 3+ ions at 360 nm. The absorption edges reveal an obvious increase with the Bi 2 O 3 content. FTIR spectra reveal vibrational bands characteristic for triangular borate groups at 1200-1600 cm −1 , tetrahedral borate groups at 800 -1200 cm −1 together with interference of Bi-O vibrations upon the introduction of Bi 2 O 3 . The observed bands at about 429, 465, and 595 cm −1 are related to BiO 6 and the band at 879 cm −1 is related to BiO 3 in the host sample 15 % Bi 2 O 3 . Thermal properties are found to depend on the Bi 2 O 3 content depending on the specific role of the formed groups (BiO 6 , BO 3 ) and their function as modifier or former together with the formation of nonbridging oxygens.

In Operando Investigation of the Concentration Dependent NO2 Sensing Mechanism of Bi2S3 Nanorods at Low Temperatures and the Interference of O3

“…To identify the surface species responsible for the increase in resistance observed under oxygen exposure, DRIFT spectroscopy was performed (SI Figure S2). In case the formation of Bi–O–Bi bonds is responsible for the increase in resistance, increasing bands between 820 and 420 cm –1 are expected . This wavenumber range cannot be investigated with the available setup.…”

“…In case the formation of Bi− O−Bi bonds is responsible for the increase in resistance, increasing bands between 820 and 420 cm −1 are expected. 15 This wavenumber range cannot be investigated with the available setup. However, the oxidation of the sulfide sulfur to different sulfoxides can be excluded since one would expect bands between 1200 and 850 cm −1 .…”

A Functionalized Silicate Adsorbent and Exploration of Its Adsorption Mechanism

“…The tensile peak at 887 cm −1 was attributed to Si-O-Na [26]. The spectra also showed a Si-OH stretching peak at 970 cm −1 [27,28], and Si-OH and H-O-H stretching vibrational peaks at 1454 cm −1 and 3450 cm −1 , respectively [29][30][31]. The results indicated that NaOH destroyed Si-O-Si bond under calcination, while Si-OH and Si-O-Na were formed at the same time to activate the silicon.…”

Effect of Zn Doping on Bismuth Oxide Thin Films

“…This behavior recommends a decrease of the crystallinity of the samples with the growth of zinc concentration. [12][13][14][15].…”