Formation kinetics of Sr0.25Ba0.75Nb2O6 and Li2B4O7 crystals from 0.25SrO–0.75BaO–Nb2O5–Li2O–2B2O3 glass

Baek, Chang Gyu; Rim, Young Hoon; Ko, Jae‐Hyeon; Kim, Chang-Seok; Yang, Yong Suk

doi:10.1039/d0ra01541e

Cited by 1 publication

(2 citation statements)

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“…Figure 2c ) presented the highest strain. This is characteristic of samples with smaller crystallites since they have a higher surface tension, which tends to create more distortions in the network [54]. It is worth mentioning that the crystallite size determined is not related to the particle size of the material.…”

Section: Resultsmentioning

confidence: 98%

“…The strain and crystallite size can affect the width and intensity of the diffraction peaks. Thus, the FWHM can be written as b hkl ¼ b size þ b strain , where after rearranging the equation, the effects of the crystallite size can be rewritten as b size ¼ Kk=D cos h and that of the strain as b strain ¼ 4e sin h [54,55]. Figure 2c ) presented the highest strain.…”

Section: Resultsmentioning

confidence: 99%

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Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

et al. 2021

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The performance of niobium pentoxide (Nb 2 O 5 ) as photoanodes in dye-sensitized solar cells (DSSCs) and as catalysts in the photocatalytic degradation of Rhodamine B (RhB) was investigated. Four samples of Nb 2 O 5 (Nb 2 O 5 _SG, Nb 2 O 5 _CR, Nb 2 O 5 _PP, and Nb 2 O 5 _MA) were synthesized by four different methods, respectively, entailing the sol-gel, combustion, polymeric precursors, and a microwave-assisted hydrothermal reaction. In all these samples, the orthorhombic phase of Nb 2 O 5 was obtained, which resulted in different shapes and assemblies, which is very relevant because the surface area, shape, and size distribution of the nanoparticles significantly contribute to the optical process. The bandgap remained constant at 3.0 eV for all the samples, even for the sample prepared by the combustion method. An additional phase, which is related to local distortions, was revealed by Raman spectroscopy within the vibration range of 688-260 cm -1 . DSSCs using photoanodes with smaller and more dispersed Nb 2 O 5 particles showed better results than those with inhomogeneities. For comparison, DSSCs were assembled using two different counter electrodes, platinum and graphite. The DSSC with platinum showed better photovoltaic results, mainly with photocurrents from 1.17 mA.cm -2 for Nb 2 O 5 _CR to 1.64 mA.cm -2 for Nb 2 O 5 _SG. The same trend was observed for the photocatalytic degradation of RhB, where the smaller and dispersed particles of Nb 2 O 5 _CR and Nb 2 O 5 _SG exhibited the best performance and, respectively, degraded approximately 75% and 61% of the RhB dye over 180 min. Therefore, the results of this study established a correlation between the synthesis methods and photonic behavior.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%