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Phase transitions in Al2(WO4)3: high pressure investigations of low frequency dielectric constant and crystal structure
- Source :
- Journal of Physics: Condensed Matter. 16:7321-7330
- Publication Year :
- 2004
- Publisher :
- IOP Publishing, 2004.
-
Abstract
- Results of the low frequency dielectric constant (e), dielectric loss and x-ray powder diffraction (XRD) measurements on orthorhombic Al 2 (WO 4 ) 3 under pressure are reported. The dielectric constant and the dielectric loss both show a sharp peak at about 0.5 GPa, indicating a ferroelastic phase transformation. This phase is found to be identical to the low temperature monoclinic phase of Al 2 (WO 4 ) 3 . Another monoclinic modification of Al 2 (WO 4 ) 3 is also observed from our XRD studies at 3.4 GPa. Al 2 (WO 4 ) 3 amorphizes above a pressure of 18 GPa, and this pressure induced amorphization is attributed to the lack of thermal activation for decomposition.
Details
- ISSN :
- 1361648X and 09538984
- Volume :
- 16
- Database :
- OpenAIRE
- Journal :
- Journal of Physics: Condensed Matter
- Accession number :
- edsair.doi...........0d5574e351a774fdb4b0d257106ac5e6