Synchrotron X-ray and neutron diffraction studies of NaAlH4 containing Ti additives

Autor:	Hendrik W. Brinks, Craig M. Jensen, Sesha S. Srinivasan, Didier Blanchard, Bjørn C. Hauback, Keeley Murphy
Rok vydání:	2004
Předmět:	Diffraction Materials science Mechanical Engineering Neutron diffraction Metals and Alloys Analytical chemistry Synchrotron radiation Synchrotron Amorphous solid law.invention Crystallography Mechanics of Materials law X-ray crystallography Materials Chemistry Ball mill Solid solution
Zdroj:	Journal of Alloys and Compounds. 376:215-221
ISSN:	0925-8388
Popis:	NaAlH4, Na3AlH6 and NaH samples with Ti additives have been investigated by synchrotron X-ray diffraction and neutron diffraction. Directly after ball milling there are no signs of any Ti-containing phases, and the unit-cell dimensions of NaAlH4, Na3AlH6 and Al give no indication of any solid solutions. Combined refinements of X-ray and neutron diffraction of Na1−3xTixAlD4 and NaAl1−xTixD4 show no indications of such solid solutions. Hence it is concluded that the Ti is in an amorphous state directly after ball milling. After cycling, however, a shoulder on the high-angle side of the Al reflections appears that is interpreted as a fcc solid solution Al1−xTix with x≈0.07. Furthermore, addition of TiF3 by ball milling results in different phases compared to TiCl3/TiCl4. The chlorides give NaCl, whereas no NaF is formed by the fluoro additive. It has not yet been possible to determine by X-ray diffraction where the fluorine is in the sample.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a8e2a99587d2d719dbce5bb4704adf6c https://doi.org/10.1016/j.jallcom.2003.12.024 Zobrazit plný text záznamu Full Text from ScienceDirect