Structural Origin of Additional Infrared Transparency and Enhanced Glass-Forming Ability in Rare-Earth-Rich Borate Glasses without B–O Networks

Abstract

R2O3–B2O3 binary glasses (R denotes rare-earth elements or Y) were fabricated in a very wide composition region using a levitation technique. The maximum R2O3 content of light rare-earth compounds reached 63 mol % and decreased with a decrease in the ionic radius of R3+. The thermal, optical, vibrational, and structural properties were investigated, particularly for 50R2O3–50B2O3 glasses. The glass transition temperature increased with a decrease in the ionic radius of R3+, while the thermal stability was not affected by the glass composition. The packing density increased with a decrease in the ionic radius of R3+ due to lanthanoid contraction. Raman scattering and Fourier transform infrared spectra revealed that, in the rare-earth-rich glasses, no conventional three-dimensional networks consisting of corner-sharing BO n (n = 3 or 4) units existed because all B atoms were formed as isolated BO3 units. The simple environment around B atoms in the glasses led to additional IR transmittance regions, irrespective of the kinds of R. The total correlation functions obtained from high-energy X-ray diffraction measurements were analyzed using the pair-function method and compared with those of various RBO3 crystalline phases. It was suggested that the local structure around R resembles the ν-NdBO3-type crystal structure, and the O coordination number of R ranged from 6.5 to 7.7, smaller than that of the crystalline phase. The glass-forming ability depending on R was discussed based on the structural similarities between the melt, glass, and crystalline phases.

Boronic Ester-Mediated Dual Recognition Coupled with a CRISPR/Cas12a System for Lipopolysaccharide Analysis

“…Meanwhile, the modification of APBA on carboxylated magnetic beads results in the increase of the hydrodynamic diameter from 1280 to 1420 nm and the decrease of the ζ potential from −23 to −17 mV (Figure C). Moreover, the disappearance of peaks at 1519, 1382, and 1060 cm –1 ascribed to the asymmetric stretching vibration of B–O and 669 cm –1 attributed to the bending vibration of B–O can be explained for the breakage of the B–O bond (Figure B). , At the same time, the hydrodynamic diameter increases to 1552 nm, and the ζ potential further decreases (Figure C). These confirm the successful capture of LPS by MB@APBA with the formation of the borate ester bond.…”

Composition dependence of the local structure and transparency of Gd₂O₃–B₂O₃ binary glasses prepared via aerodynamic levitation

“…It has previously been shown in the literature that additional transmittance in these IR regions is universal for rare-earth-rich borate glasses. 10) This additional transmission is due to the reduced overlap of the absorption bands as a result of their multiple vibrations and their overtones. In this study, by investigating the composition dependence of Gd-rich Gd 2 O 3 B 2 O 3 glasses, it was found that transparency was observed when x > 45.…”

Surface Micron-Structure Engineering of Halide Perovskite Doped Glass-Ceramic and Its Ionic Transport Application

“…Raman results are as follows: (1) Layer-I has Raman peaks ahead of 300 nm assigned to Cs 4 PbBr 6 PQDs, but no obvious glass signals. (2) Layer-II and Layer-III oppositely present characteristic glass peaks located at 789 cm –1 ([BO 3 ] group) and 698 cm –1 ([GeO 4 ] group) with one shoulder at 442 cm –1 (symmetrical vibrations of the Ge–O–Ge bond), but no apparent PQD signals. − Additionally, the bigger E g value of Layer-III (about 2.83 eV, compared with Layer-II) suggests that Layer-I is PQDs-rich, Layer-III is glass-rich, and Layer-II is in between. The low band gap energy of glass layers presents a good semiconductor property that is expected to apply to photoelectric and electrochemical fields.…”