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khademinia, S., Behzad, M. (2018). Low temperature hydrothermal synthesis, evaluation of band gap energies and catalytic performance for Biginelli reactions of Sr2-xAxNb2O7+δ (A=Eu3+ and Nd3+) (x = 0.01 and 0.05) nanomaterials. Journal of Nanoanalysis, 5(1), 66-76. doi: 10.22034/jna.2018.541851
shahin khademinia; Mahdi Behzad. "Low temperature hydrothermal synthesis, evaluation of band gap energies and catalytic performance for Biginelli reactions of Sr2-xAxNb2O7+δ (A=Eu3+ and Nd3+) (x = 0.01 and 0.05) nanomaterials". Journal of Nanoanalysis, 5, 1, 2018, 66-76. doi: 10.22034/jna.2018.541851
khademinia, S., Behzad, M. (2018). 'Low temperature hydrothermal synthesis, evaluation of band gap energies and catalytic performance for Biginelli reactions of Sr2-xAxNb2O7+δ (A=Eu3+ and Nd3+) (x = 0.01 and 0.05) nanomaterials', Journal of Nanoanalysis, 5(1), pp. 66-76. doi: 10.22034/jna.2018.541851
khademinia, S., Behzad, M. Low temperature hydrothermal synthesis, evaluation of band gap energies and catalytic performance for Biginelli reactions of Sr2-xAxNb2O7+δ (A=Eu3+ and Nd3+) (x = 0.01 and 0.05) nanomaterials. Journal of Nanoanalysis, 2018; 5(1): 66-76. doi: 10.22034/jna.2018.541851

Low temperature hydrothermal synthesis, evaluation of band gap energies and catalytic performance for Biginelli reactions of Sr2-xAxNb2O7+δ (A=Eu3+ and Nd3+) (x = 0.01 and 0.05) nanomaterials

Article 8, Volume 5, Issue 1, Winter 2018, Page 66-76  XML PDF (1.14 MB)
Document Type: Original Research Paper
DOI: 10.22034/jna.2018.541851
Authors
shahin khademinia orcid 1; Mahdi Behzad2
1Department of Inorganic Chemistry, Faculty of Chemistry, Semnan University, Semnan 35351-19111, Iran
2Department of Inorganic Chemistry, Faculty of Chemistry, Semnan University, Semnan, Iran
Abstract
Nano powders Eu3+ and Nd3+ - doped Sr2Nb2O7 were prepared by a low temperature hydrothermal
method at 120 ºC for 48 h followed by annealing at 400 ᵒC for 3 h among Sr(NO3)2
and Nb2O5, Eu2O3 and Nd2O3 raw materials at stoichiometric 1:1 Sr:Nb molar ratio. Characterization
of the synthesized materials was performed by X-ray powder diffraction (XRPD)
technique. FullProf program employing profile matching with constant scale factors was employed
for structural analysis. The results showed that the patterns had a main Sr2Nb2O7 orthorhombic
crystal structure with space group . FESEM images showed that the synthesized
nanomaterials had flower morphologies. Ultraviolet-visible spectra analysis showed that the
synthesized Eu3+ and Nd3+ - doped Sr2Nb2O7 nanomaterials had light absorption in the ultraviolet
light region. The direct optical band gap energies obtained from UV-Vis absorption spectra
were 3.45, 3.50 and 3.80 eV for pure Sr2Nb2O7, S2 and S4, respectively. The catalytic activity of
the obtained materials in the one-pot synthesis of the heterocyclic compounds 3,4-dihydropyrimidin-
2(1H)-ones (DHPMs) in Biginelli reaction is investigated. The optimized 0.03 g of the
catalyst, 95 ºC reaction temperature, and 60 min reaction time are used for the other Biginelli
reactions in this work.
Keywords
Sr2Nb2O7; Rietveld; Hydrothermal; crystal structure; Biginelli
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