TY - GEN
T1 - Structural studies of hydrogen storage alloys using x-ray/neutron diffraction and total scattering
AU - Nakamura, Yumiko
AU - Kim, Hyunjeong
AU - Yamazaki, Saishun
AU - Sakaki, Kouji
AU - Proffen, Thomas
AU - Akiba, Etsuo
N1 - Funding Information:
Part of this work was supported by the New Energy and Industrial Technology Development Organization (NEDO) under Advanced Fundamental Research on Hydrogen Storage aterialsMYDR-(STAR. HO) Thetudy on(sg)i2lMloysaNsa,owtedcCnolabntioit hM .lw.aoierdcsnhNta aTruirac and Mr.S. TsunokakeapanoetJalsnmaic alsftdMdCeurffrctio .oeatsuaroCm ennNne.th , m deLi conducted atEasIuwedsFrpauck. HE.y bIhpbr BdatFioSonoy-rroyaiaon.fcn r Dtt Xra measurementtPSasAuwedsr. Chupaps. ro bAaptioglPNabtofLyonoor ranDyrtan. e Synthesisnd characaterzatiogi-CllMoneruwedsyeor .. Npakou s ,Hs .hoJb pa mfrSa,yao rDt and J. MatsudaIST.oAf
PY - 2011
Y1 - 2011
N2 - Crystal and local structures and hydrogen occupation of Mg containing materials, (Mg,Ca)Ni x(x = 2, 3) intermetallic compounds and a MgCo metastable alloy, have been investigated using in-situ and ex-situ X-ray/neutron diffraction and total scattering. A C15 Laves phase (Mg 0.67Ca 0.33)Ni 2 showed isotropic lattice expansion upon hydrogenation. Mg and Ca occupied the same site randomly. It has two hydrogen sites, Mg(Ca) 2Ni 2 site and M(Ca)Ni 3 site. Mg 2CaNi 9, MgCa 2Ni 9, and CaNi 3 compounds consisted of MgZn 2-type (Mg,Ca) 2Ni 4 cell and CaCu 5-type CaNi 5 cell stacking along the c-axis. The MgZn 2-type cell was occupied by only Mg in Mg 2CaNi 9, and randomly occupied by both Mg and Ca in MgCa 2Ni 9. Expansion of this cell strongly depended on the composition: larger expansion was observed in a Ca-rich composition. Local structure of a Mg-Co alloy synthesized by mechanical alloying has been studied using the PDF (Pair Distribution Function) method. The analysis suggested that material contained two 1-2 nm domains with different compositions and local structures, i.e. Mg-rich and Co-rich domains, and hydrogen was located only in the Mg-rich domain.
AB - Crystal and local structures and hydrogen occupation of Mg containing materials, (Mg,Ca)Ni x(x = 2, 3) intermetallic compounds and a MgCo metastable alloy, have been investigated using in-situ and ex-situ X-ray/neutron diffraction and total scattering. A C15 Laves phase (Mg 0.67Ca 0.33)Ni 2 showed isotropic lattice expansion upon hydrogenation. Mg and Ca occupied the same site randomly. It has two hydrogen sites, Mg(Ca) 2Ni 2 site and M(Ca)Ni 3 site. Mg 2CaNi 9, MgCa 2Ni 9, and CaNi 3 compounds consisted of MgZn 2-type (Mg,Ca) 2Ni 4 cell and CaCu 5-type CaNi 5 cell stacking along the c-axis. The MgZn 2-type cell was occupied by only Mg in Mg 2CaNi 9, and randomly occupied by both Mg and Ca in MgCa 2Ni 9. Expansion of this cell strongly depended on the composition: larger expansion was observed in a Ca-rich composition. Local structure of a Mg-Co alloy synthesized by mechanical alloying has been studied using the PDF (Pair Distribution Function) method. The analysis suggested that material contained two 1-2 nm domains with different compositions and local structures, i.e. Mg-rich and Co-rich domains, and hydrogen was located only in the Mg-rich domain.
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U2 - 10.1557/opl.2011.1310
DO - 10.1557/opl.2011.1310
M3 - Conference contribution
AN - SCOPUS:84860546373
SN - 9781618395306
T3 - Materials Research Society Symposium Proceedings
SP - 13
EP - 17
BT - Recent Developments in Materials for Hydrogen Storage and Carbon-Capture Technologies
T2 - 2011 MRS Spring Meeting
Y2 - 25 April 2011 through 29 April 2011
ER -