Hydrogen-induced phase decomposition of Ba7Al13 and the crystal structure of Ba2AlH7

Zhang, Q.A.; Nakamura, Yumiko; Oikawa, Kenichi; Kamiyama, Takashi; Akiba, Etsuo

doi:10.1016/s0925-8388(03)00420-1

Cited by 25 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average Al-D distances in corner-sharing AlD6 octahedra in MAlD5 are consistent with those found in hexa-alanates [3], Sr2AlD7 [14] and Ba2AlD7 [26]. However the D-Al-D angles in the penta-alanates (Table 3) Figure 3 shows the metal cation dependences on the average metal cation-Al and Al-D distances [3,[8][9][10][12][13][14][25][26][27][28][29][30][31][32][33][34][35][36][37] in related alanates (deuterides) with covalent Al-D bonds. The average Al-D distances in corner-sharing AlD6 octahedra in MAlD5 are consistent with those found in hexa-alanates [3], Sr2AlD7 [14] and Ba2AlD7 [26].…”

Section: Discussionsupporting

confidence: 79%

“…Although only EuAlH 5 has been experimentally identified, divalent rare-earth metals with close ionic radius to Ca 2+ , Sr 2+ and Ba 2+ would be speculated to form penta-alanates such as EuAlH 5 . Figure 3 shows the metal cation dependences on the average metal cation-Al and Al-D distances [3,[8][9][10][12][13][14][25][26][27][28][29][30][31][32][33][34][35][36][37] in related alanates (deuterides) with covalent Al-D bonds. The average Al-D distances in corner-sharing AlD 6 octahedra in MAlD 5 are consistent with those found in hexa-alanates [3], Sr 2 AlD 7 [14] and Ba 2 AlD 7 [26].…”

Section: Discussionmentioning

confidence: 99%

“…Figure 3 shows the metal cation dependences on the average metal cation-Al and Al-D distances [3,[8][9][10][12][13][14][25][26][27][28][29][30][31][32][33][34][35][36][37] in related alanates (deuterides) with covalent Al-D bonds. The average Al-D distances in corner-sharing AlD 6 octahedra in MAlD 5 are consistent with those found in hexa-alanates [3], Sr 2 AlD 7 [14] and Ba 2 AlD 7 [26]. However the D-Al-D angles in the penta-alanates (Table 3) Figure 3 shows the metal cation dependences on the average metal cation-Al and Al-D distances [3,[8][9][10][12][13][14][25][26][27][28][29][30][31][32][33][34][35][36][37] in related alanates (deuterides) with covalent Al-D bonds.…”

Section: Discussionmentioning

confidence: 99%

“…In CaAlSiD, SrAlSiD, BaAlSiD and SrAl2D2, Ca, Sr and Ba were formally considered as their metal cation. 6 , K 2 NaAlH 6 , LaAlH 6 , CeAlH 6 , PrAlH 6 and NdAlH 6 (LiCa(AlH 4 ) 3 and LiCaAlH 6 are theoretical calculation results) [3,[8][9][10][12][13][14][25][26][27][28][29][30][31][32][33][34][35][36][37] because their crystal structural investigations on deuterides have not been reported. Average metal cation-Al distance of Na 3 AlD 6 (3.65 Å) [33] is overlapped with NaAlD 4 (3.66 Å) [28].…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

et al. 2018

View full text Add to dashboard Cite

Aluminium-based complex hydrides (alanates) composed of metal cation(s) and complex anion(s), [AlH 4 ] − or [AlH 6 ] 3− with covalent Al-H bonds, have attracted tremendous attention as hydrogen storage materials since the discovery of the reversible hydrogen desorption and absorption reactions on Ti-enhanced NaAlH 4 . In cases wherein alkaline-earth metals (M) are used as a metal cation, MAlH 5 with corner-sharing AlH 6 octahedron chains are known to form. The crystal structure of SrAlH 5 has remained unsolved although two different results have been theoretically and experimentally proposed. Focusing on the corner-sharing AlH 6 octahedron chains as a unique feature of the alkaline-earth metal, we here report the crystal structure of SrAlD 5 investigated by synchrotron radiation powder X-ray and neutron diffraction.

show abstract

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

et al. 2018

View full text Add to dashboard Cite

show abstract

“…While BaAlH 5 is formed between 100 and 280 C, Ba 2 AlH 7 was reported to form together with Al during the hydrogenation of Ba 7 Al 13 at temperatures higher than 280 C [205]. Starting from Ba 7 Al 13 at about 60 C, BaAlH 5 and Al are formed.…”

Section: Synthesis and Crystal Structurementioning

confidence: 99%

Complex Hydrides

and

Felderhoff

2010

Handbook of Hydrogen Storage

View full text Add to dashboard Cite

Complex hydrides are salt-like materials in which hydrogen is covalently bound to the central atoms, in this way a crystal structure consisting of so-called complex anions is formed. In general, complex hydrides have the chemical formula A x Me y H z . Compounds where position A is preferentially occupied by elements of the first and second groups of the periodic table and Me is occupied either by boron or aluminum are well known and have been intensively investigated. However, another possibility is that complex hydrides are built by transition metal cations. Complex metal hydrides have been known for more than 50 years, but for many years they were not considered for reversible hydrogen storage due to the high kinetic barriers of the decomposition requiring high temperatures. The situation changed in 1997 when Bogdanovi c and Schwickardi discovered that the kinetic barrier of the decomposition of the complex metal hydride, NaAlH 4 , can be lowered by the addition of Ti catalysts and that the material becomes reversible close to acceptable technical conditions [1]. They further showed not only that catalysts can enhance the kinetics of dehydrogenation but also that rehydrogenation under moderate conditions becomes feasible. This breakthrough induced the publication of a tremendous number of papers focusing on the synthesis and the properties of complex hydrides. The major goal is to understand the basic steps of dehydrogenation and rehydrogenation and the role of catalysts. Many complex metal hydrides have high hydrogen gravimetric storage capacities and some of them are commercially available. Some complex hydride systems, such as Mg 2 FeH 6 and Al(BH 4 ) 3 , have an extremely high volumetric hydrogen density of up to 150 kg m À3 . Compared to liquid hydrogen with a volumetric density of 70 kg m À3 , the amount of hydrogen in such metal hydrides is much higher. This makes complex transition metal hydrides interesting as potential storage materials.Handbook of Hydrogen Storage. Edited by Michael Hirscher

show abstract

Hydrogen‐Induced Phase Decomposition of Ba₇Al₁₃ and the Crystal Structure of Ba₂AlH₇.

et al. 2003

View full text Add to dashboard Cite

Hydrogen-Induced Phase Decomposition of Ba 7 Al 13 and the Crystal Structure of Ba 2 AlH 7 . -The title compound reacts with hydrogen (7 MPa) to form BaAlH 5 and Al between 373 and 553 K. In the temperature range 553-603 K, Ba7Al13 is hydrogenated to Ba2AlH7 and Al. Further increase of the temperature leads to the hydrogen-induced decomposition of the title compound into Ba2AlH7 and BaAl4. As revealed by neutron powder diffraction Ba 2 AlD 7 is isostructural to Sr 2 AlD 7 and crystallizes in the monoclinic space group I2/a. -(ZHANG, Q. A.; NAKAMURA, Y.; OIKAWA, K.; KAMIYAMA, T.; AKIBA*, E.; J.

show abstract

Hydrogen-induced phase decomposition of Ba7Al13 and the crystal structure of Ba2AlH7

Cited by 25 publications

References 29 publications

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

Complex Hydrides

Hydrogen‐Induced Phase Decomposition of Ba₇Al₁₃ and the Crystal Structure of Ba₂AlH₇.

Contact Info

Product

Resources

About

Hydrogen-induced phase decomposition of Ba7Al13 and the crystal structure of Ba2AlH7

Cited by 25 publications

References 29 publications

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

Crystal Structural Determination of SrAlD5 with Corner-Sharing AlD6 Octahedron Chains by X-ray and Neutron Diffraction

Complex Hydrides