Investigation of LA0.7Sr0.3VO3.86-o (LSV) Vanadium Oxidation Number and Oxygen Stoichiometry From Experimental Optical Microscopy Characterization and Rietveld Refinement Calculations

Abstract

The purpose of this effort was to analyze optical color differences in the La0.7Sr0.3VO3.86- (LSV)material (i.e., powder) after being exposed to various 300 ppm sulfur-contaminated fuels (i.e., hydrogen (H2) gas, methane (CH4) gas, and liquid methanol (CH3OH)) at operating temperatures between 400-700C. When the exposed samples were compared their optical properties were observed to be similar after being heated at the same operating temperatures in both hydrogen and methane gas mixtures. Differences in optical properties were observed to emerge with the use of liquid methanol, wherein exposed samples exhibited different sample colors at lower operating temperatures than hydrogen and methane gas exposed samples. Color changes in oxides can be attributed to changes in the oxidation number of transition metal elements, which is vanadium in the case of LSV.

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Document Details

Document Type
Technical Report
Publication Date
Apr 12, 2023
Accession Number
AD1216578

Entities

People

  • Talia Sebastian
  • Theodore Burye

Tags

DTIC Thesaurus Topics

  • Advanced Materials
  • Alcohol Fuels
  • Alcohols
  • Chemistry
  • Crystal Structure
  • Decomposition
  • Electron Microscopy
  • Energy
  • Flow Rate
  • Fuel Cells
  • Ground Vehicles
  • Materials
  • Materials Science
  • Methanols
  • Phase Transformations
  • Sulfur Compounds
  • United States Government

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Image Processing and Computer Vision.
  • Thermal Physics or Thermal Science.