TY - GEN
T1 - High pressure synthesis of novel Li-TM hydrides (TM = Nb, Ta)
AU - Kamegawa, Atsunori
AU - Kataoka, Riki
AU - Okadaa, Masuo
N1 - Funding Information:
This work has been supported in part by the Japan NEDO project (New Energy and industrial technology Development Organization) and the Grant-in Aids for Young Scientists (B) (No. 22760527) from the Ministry of Culture, Science and Education.
PY - 2012
Y1 - 2012
N2 - High-pressure synthesis has been widely used for exploration of novel materials. In this study, new Li-based hydrides in Li-Nb and Li-Ta systems have been successfully synthesized under GPa-order by using a cubic-anvil-type apparatus. And crystal structures, thermal stabilities of novel hydrides were investigated. For Li-Nb-H system, novel hydride with primitive hexagonal structure was synthesized at 973 K under 5 GPa. Its lattice parameter was a = 0.56250(5) nm, c = 0.57416(4) nm. A structural model of the hydride was CaCu5-type structure (P6/mmm, No. 191). For Li-Ta system, novel hydride with C-face centered monoclinic structure was obtained at 973 K under 5 GPa. Its lattice parameter was a = 0.7918(5) nm, b = 0.8012(4) nm, c = 1.030(7) nm, β = 111.27 (6)°. These novel hydrides in Li-Nb and Li-Ta systems were decomposed at 510 K and 573 K, respectively, and these values were about 400 K lower than that of LiH (>953 K).
AB - High-pressure synthesis has been widely used for exploration of novel materials. In this study, new Li-based hydrides in Li-Nb and Li-Ta systems have been successfully synthesized under GPa-order by using a cubic-anvil-type apparatus. And crystal structures, thermal stabilities of novel hydrides were investigated. For Li-Nb-H system, novel hydride with primitive hexagonal structure was synthesized at 973 K under 5 GPa. Its lattice parameter was a = 0.56250(5) nm, c = 0.57416(4) nm. A structural model of the hydride was CaCu5-type structure (P6/mmm, No. 191). For Li-Ta system, novel hydride with C-face centered monoclinic structure was obtained at 973 K under 5 GPa. Its lattice parameter was a = 0.7918(5) nm, b = 0.8012(4) nm, c = 1.030(7) nm, β = 111.27 (6)°. These novel hydrides in Li-Nb and Li-Ta systems were decomposed at 510 K and 573 K, respectively, and these values were about 400 K lower than that of LiH (>953 K).
KW - High pressure synthesis
KW - Li-Nb-h
KW - Li-Ta-H
KW - Lithium
KW - New hydride
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=84897061613&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897061613&partnerID=8YFLogxK
U2 - 10.1016/j.egypro.2012.09.033
DO - 10.1016/j.egypro.2012.09.033
M3 - Conference contribution
AN - SCOPUS:84897061613
SN - 9781627483179
T3 - Energy Procedia
SP - 276
EP - 282
BT - WHEC 2012 Conference Proceedings - 19th World Hydrogen Energy Conference
PB - Elsevier Ltd
T2 - 19th World Hydrogen Energy Conference, WHEC 2012
Y2 - 3 June 2012 through 7 June 2012
ER -