Triclinic yellow tungsten oxide is also known as triclinic tungsten trioxide or triclinic WO3. According to the researchers, the triclinic phase is the thermodynamically stable form of tungsten trioxide at room temperature. They refined the triclinic yellow tungsten oxide for the first time from neutron diffraction data, which were obtained on a new high resolution powder diffractometer.
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The researchers also introduced that the structure obtained appears to be somewhat more accurate than that obtained from single crystal X-ray diffraction data. Rietveld approach was used to refine the neutron powder diffraction data. Results using the software packages GSAS, Rietan and PROFIL are compared. Using GSAS, an Rwp of 7.97 and an Rp of 5.87 were obtained. Neutron diffraction data were also collected and analyzed on a sample which was a mixture of the monoclinic and triclinic forms of WO3. Rietveld refinements of this data were stable and yielded reasonable results.
