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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Ag2Mo3O10·2H2O nanorods under high pressure: In situ Raman spectroscopy.

J V B Moura1, W C Ferreira2, J G da Silva-Filho3

  • 1Department of Physics, Federal University of Maranhão, 65080-805 São Luís, MA, Brazil.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 20, 2023
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Summary

Silver trimolybdate dihydrate nanorods undergo reversible phase transformations under high pressure. In situ Raman scattering reveals distinct structural changes at specific pressure points, indicating pressure-induced phase transitions.

Keywords:
Phase transitionsPressure dependenceRaman spectroscopySilver trimolybdate dihydrate

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Spectroscopy

Background:

  • Silver trimolybdate dihydrate (Ag2Mo3O10·2H2O) is a material with potential applications.
  • Understanding its behavior under pressure is crucial for material design and application.
  • Previous studies may not have fully explored its high-pressure phase transitions.

Purpose of the Study:

  • To investigate the pressure-dependent behavior of silver trimolybdate dihydrate nanorods.
  • To identify and characterize pressure-induced phase transformations.
  • To elucidate the structural changes occurring under hydrostatic pressure.

Main Methods:

  • Hydrothermal synthesis of Ag2Mo3O10·2H2O nanorods.
  • Structural and morphological characterization using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM).
  • In situ Raman scattering measurements up to 5.0 GPa using a membrane diamond-anvil cell (MDAC).

Main Results:

  • Synthesis of Ag2Mo3O10·2H2O nanorods confirmed by XRD and SEM.
  • Raman spectra showed splitting and emergence of new bands at pressures above 0.5 GPa and 2.9 GPa.
  • Reversible phase transformations were observed: Phase I (ambient to 0.5 GPa), Phase II (0.8 GPa to 2.9 GPa), and Phase III (above 3.4 GPa).

Conclusions:

  • Silver trimolybdate dihydrate nanorods exhibit distinct pressure-induced phase transitions.
  • The observed phase transformations are reversible.
  • Raman spectroscopy is an effective tool for probing high-pressure behavior in nanomaterials.