Journal
MODERN PHYSICS LETTERS B
Volume 35, Issue 35, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217984921501712
Keywords
Nb2O5; crystallization degree; atomic arrangement; UV absorption; Raman scattering
Funding
- National Natural Science Foundation of P. R. China [51302003]
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In this study, Nb2O5 was prepared by the sol-gel method and the crystallization process was investigated through thermal analysis, X-ray diffraction, UV-vis spectra, and Raman spectra. The results showed that amorphous Nb2O5 transformed into a pseudo-hexagonal phase with increasing temperature, leading to changes in crystallization degree, optical properties, and atomic arrangement. The atomic structure of Nb2O5 transitioned from short-range order to medium-range order, and then to long-range order as temperature increased.
In this study, Nb2O5 was prepared by the sol-gel method. Crystallization process was investigated by thermal analysis (TG-DSC), X-ray diffraction (XRD), UV-vis spectra and Raman spectra. TG-DSC results indicated that amorphous Nb2O5 appeared at 460 degrees C. XRD results indicated that amorphous Nb2O5 transformed into pseudo-hexagonal phase and crystallization degree has an increasing trend with an increase of temperature. UV-vis and Raman spectra results reflected the significant variations of optical property and atomic structure in this process. Nb2O5 atomic arrangement transforms from short-range order to medium-range order, then to long-range order. Atoms transform into long-range ordered structure through connection of structural units with increasing temperature. Additionally, crystallization degree, optical property and atomic arrangement all are mutually connected in the crystallization process.
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