کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1626709 | 1516444 | 2007 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: V2O5 phase diagram revisited at high pressures and high temperatures V2O5 phase diagram revisited at high pressures and high temperatures](/preview/png/1626709.png)
New experiments on V2O5 have been performed using large volume high pressure and high temperature devices, to pressures up to 29 GPa and temperatures up to 1500 °C. Post-temperature and pressure quench, samples have been structurally analysed using X-ray diffraction and Raman spectroscopy. Data obtained confirms earlier experimental results at elevated pressures and temperatures, and reveals the stability range of the high-pressure phases far beyond the previously known region. Rietveld refinement of the δ-phase of V2O5 shows that the phase crystallizes in space group C12/c1 (no. 15) with a = 11.9719(2) Å, b = 4.7017(1) Å, c = 5.3253(1) Å, β = 104.41(0)°, V = 290.32(7) Å3 and Z = 4. The tentative mapping of phase boundaries is also in agreement with our theoretical predictions for pressure-induced transitions at absolute zero temperature.
Journal: Journal of Alloys and Compounds - Volume 429, Issues 1–2, 21 February 2007, Pages 87–98