| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1615537 | Journal of Alloys and Compounds | 2012 | 7 Pages |
The effect of additives and mechanochemical processing at low temperature on β-AlD3 has been studied. β-AlD3 synthesized by wet chemistry was mixed with selected fluorides and cryomilled. Investigations of the fractions of α-, α′- and β-AlD3 in the samples show that the additive and cryomilling affect the ratio of the polymorphs. Addition of AlF3 leads to the highest ratio of α-AlD3, while addition of TiF3 leads to full decomposition to Al. Formation of α′-AlD3 during milling with NaF or MgF2 is observed.The presence of fluorides in the synthesis of alane by cryomilling showed no notable impact on the ratios of the alane polymorphs compared to cryomilling without additives.
► Cryomilling with additives changes the ratio of the alane polymorphs α-, α′- and β-AlD3. ► Mixing β-AlD3 with AlF3, (isostructural to α-AlD3), yields an increased fraction of α-AlD3. ► Transformation from β- to α′-AlD3 was observed, to our knowledge not previously reported. ► In-situ SR-PXD showed no kinetic enhancements of decomposition from the additives. ► Addition of TiF3 to β-AlD3 results in full decomposition to Al during cryomilling.
