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1 An alloy LaMg 2 Ni K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop G. Renaudin, L. Guénée and K. Yvon, J. Alloys Comp. 350 (2003) 145 Hydrogenation.

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Presentation on theme: "1 An alloy LaMg 2 Ni K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop G. Renaudin, L. Guénée and K. Yvon, J. Alloys Comp. 350 (2003) 145 Hydrogenation."— Presentation transcript:

1 1 An alloy LaMg 2 Ni K. Yvon Tateshina, March 2003 IEA Task 17 Workshop G. Renaudin, L. Guénée and K. Yvon, J. Alloys Comp. 350 (2003) 145 Hydrogenation <200°C, <8bar

2 2 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop A hydride LaMg 2 NiH 7 G. Renaudin, L. Guénée and K. Yvon, J. Alloys Comp. 350 (2003) 145 Hydrogenation <200°C, <8bar

3 3 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop G. Renaudin, N. Clayton and K. Yvon An alloy LaMg 2 Ni Hydrogenation <200°C, <8bar

4 4 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop G. Renaudin, N. Clayton and K. Yvon A hydride LaMg 2 NiH 7 Resistance changes its character and increase by ~10 6 times

5 5 Destabilization of metal hydride complexes and theoretical modeling Tateshina, March 2003 IEA Task 17 Workshop Laboratory of Crystallography, University of Geneva Yaroslav Filinchuk [for Prof. Klaus Yvon]

6 6 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop Alanates Dopped and undopped NaAlH 4 and NaAlD 4 The samples are activated upon dopping; Raman spectroscopic study of the dopped samples (opaque) is impossible; Peak breadening is observed by IR-spectroscopy (as well as by NMR – prof. Jensen) for dopped samples; X-ray powder patterns show no peak broadening (no inhomogeneity) for dopped samples.

7 7 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop Borohydrides

8 8 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop

9 9

10 10 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop Raman spectra of LiBH 4 at 412K

11 11 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop LiBH 4 => U = 3.7 Kcal/mole NaBH 4 => U = 2.9 Kcal/mole CsBH 4 => U = 1.9 Kcal/mole KBH 4 => U = 2.2 Kcal/mole S. Gomes, H. Hagemann, G. Renaudin and K. Yvon

12 12 K. Yvon Tateshina, March 2003 IEA Task 17 Workshop NaBH 4 U = 2.9 Kcal/mole KBH 4 U = 2.2 Kcal/mole LiBH 4 U = 3.7 Kcal/mole Oscillation around the B-H bond Occupational disorder Librational motion


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