The δ→ε→γ LiV2O5 “High Temperature” Phase Transitions Evidenced by Synchrotron X-Ray Powder Diffraction Analysis
✍ Scribed by Christine Satto; Philippe Sciau; Eric Dooryhee; Jean Galy; Patrice Millet
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 333 KB
- Volume
- 146
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The structural evolution and the temperature ranges of stability for the , , and phases of the lithium vanadium oxide bronze LiV 2 O 5 are evidenced by use of synchrotron X-ray powder diffraction in the temperature range 100+2503C. It is shown that -LiV 2 O 5 is stable below 1203C and that the complete transformation to the high temperature form -LiV 2 O 5 is achieved above 2203C. In the temperature range 120+2203C -LiV 2 O 5 is the stable polymorph. The temperature dependence of the cell parameters for the phase -and -LiV 2 O 5 are measured and the crystal structure of -LiV 2 O 5 has been determined using the Rietveld method. It crystallizes in the orthorhombic system and at 1403C the cell parameters are a ؍ 11.3552(6) A > , b ؍ 3.5732(2) A > , and c ؍ 4.6548(3) A > . Arguments supporting the choice of the space group Pmmn, as for another bronze NaV 2 O 5 , are given.