1

An alloyLaMg2Ni

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<200°C, <8bar

2K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

A hydrideLaMg2NiH7

G. Renaudin, L. Guénée and K. Yvon,J. Alloys Comp. 350 (2003) 145

Hydrogenation<200°C, <8bar

3K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

G. Renaudin, N. Clayton and K. Yvon

An alloyLaMg2Ni

Hydrogenation<200°C, <8bar

4K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

G. Renaudin, N. Clayton and K. Yvon

A hydrideLaMg2NiH7

Resistance changes its characterand increase by ~106 times

5

Destabilization of metal hydride complexes and theoretical modeling

Tateshina, 16-19 March 2003IEA Task 17 Workshop

Laboratory of Crystallography, University of Geneva

Yaroslav Filinchuk[for Prof. Klaus Yvon]

6K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

Alanates

Dopped and undopped NaAlH4 and NaAlD4

• 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.

7K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

Borohydrides

8K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

9K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

10K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

Raman spectra ofLiBH4 at 412K

11K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

kT

U

ecbTaT

LiBH4 => U = 3.7 Kcal/mole

NaBH4 => U = 2.9 Kcal/mole

CsBH4 => U = 1.9 Kcal/moleKBH4 => U = 2.2 Kcal/mole

S. Gomes, H. Hagemann, G. Renaudin and K. Yvon

12K. Yvon Tateshina, 16-19 March 2003 IEA Task 17 Workshop

NaBH4 U = 2.9 Kcal/mole

KBH4

U = 2.2 Kcal/mole

LiBH4

U = 3.7 Kcal/mole

Oscillation around the B-H bond Occupational disorder

Librational motion