Ag2Mo3O10·2H2O nanorods under high pressure: In situ Raman spectroscopy

J V B Moura; W C Ferreira; J G da Silva-Filho; F G Alabarse; P T C Freire; C Luz-Lima

doi:10.1016/j.saa.2023.122871

Ag₂Mo₃O₁₀·2H₂O nanorods under high pressure: In situ Raman spectroscopy

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Oct 15:299:122871. doi: 10.1016/j.saa.2023.122871. Epub 2023 May 14.

Authors

J V B Moura¹, W C Ferreira², J G da Silva-Filho³, F G Alabarse⁴, P T C Freire⁵, C Luz-Lima⁶

Affiliations

¹ Department of Physics, Federal University of Maranhão, 65080-805 São Luís, MA, Brazil. Electronic address: jvb.moura@ufma.br.
² Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA.
³ Center of Social Sciences, Health and Technology, Federal University of Maranhão, 65900-410 Imperatriz, MA, Brazil.
⁴ Elettra Sincrotrone Trieste, Trieste 34149, Italy.
⁵ Department of Physics, Federal University of Ceará, 60455-760 Fortaleza, CE, Brazil.
⁶ Department of Physics, Federal University of Piauí, 64049-550 Teresina, PI, Brazil.

PMID: 37209477
DOI: 10.1016/j.saa.2023.122871

Abstract

This work presents a pressure-dependent behavior of silver trimolybdate dihydrate (Ag₂Mo₃O₁₀·2H₂O) nanorods using in situ Raman scattering. The Ag₂Mo₃O₁₀·2H₂O nanorods were obtained by the hydrothermal method at 140 °C for 6 h. The structural and morphological characterization of the sample was performed by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). Pressure-dependent Raman scattering studies were performed on Ag₂Mo₃O₁₀·2H₂O nanorods up to 5.0 GPa using a membrane diamond-anvil cell (MDAC). The vibrational spectra under high pressure showed splitting and emergence of new bands above 0.5 GPa and 2.9 GPa. Reversible phase transformations under pressure were observed in silver trimolybdate dihydrate nanorods: Phase I - ambient phase (1 atm - 0.5 GPa) → Phase II (0.8 GPa - 2.9 GPa) → Phase III (above 3.4 GPa).

Keywords: Phase transitions; Pressure dependence; Raman spectroscopy; Silver trimolybdate dihydrate.