In situ high-temperature Raman scattering study of monoclinic Ag 2 Mo 2 O 7 microrods.

Autor: Ferreira ANC; Departamento de Física, Centro de Ciências Exatas e Tecnologia, Universidade Federal do Maranhão, CEP 65080-80, São Luís, MA, Brazil., Ferreira WC; Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA., Duarte AV; Laboratório de Caracterização de Materiais, Centro de Ciências e Tecnologia, Universidade Federal do Cariri, CEP 63048-080, Juazeiro do Norte, CE, Brazil., Santos CC; Departamento de Física, Centro de Ciências Exatas e Tecnologia, Universidade Federal do Maranhão, CEP 65080-80, São Luís, MA, Brazil., Freire PTC; Departamento de Física, Campus do Pici, Universidade Federal do Ceará, CEP 60455-760, Fortaleza, CE, Brazil., Luz-Lima C; Departamento de Física, Campus Ministro Petrônio Portella, Universidade Federal do Piauí, CEP 64049-550, Teresina, PI, Brazil., Moura JVB; Departamento de Física, Centro de Ciências Exatas e Tecnologia, Universidade Federal do Maranhão, CEP 65080-80, São Luís, MA, Brazil. Electronic address: jvb.moura@ufma.br.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2023 Jul 05; Vol. 295, pp. 122632. Date of Electronic Publication: 2023 Mar 17.
DOI: 10.1016/j.saa.2023.122632
Abstrakt: In this work, we present a temperature-dependent behavior of monoclinic silver dimolybdate (m-Ag 2 Mo 2 O 7 ) microrods using in situ Raman scattering. The m-Ag 2 Mo 2 O 7 microrods were obtained by the conventional hydrothermal method at 423 K for 24 h. The structural and morphological characterization of the sample has been done by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Temperature-dependent Raman scattering measurements were performed on m-Ag 2 Mo 2 O 7 microrods, and the results show an irreversible first-order structural phase transition at 698 K-723 K and the melting process at 773 K. Changes in the Raman spectra confirm the phase transition from the P2 1 /c monoclinic structure to the P-1 triclinic structure. No morphological changes were observed during the structural phase transition of the sample at 723 K. Time-dependent optical microscopy at 773 K showed the growth of nanowires on the Ag 2 Mo 2 O 7 microrods in the triclinic structure.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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