Synthesis of PuNi3-type PrCo3 and its hydrogen absorption–desorption property. (7th September 2016)

• Record Type: Journal Article
• Authors: Iwase, Kenji; Mori, Kazuhiro; Shimizu, Shinnosuke; Tashiro, Suguru; Suzuki, Tetsuya
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 33(2016)
• Page Start: 14788
• Page End: 14794
• Publication Date: 2016-09-07
• Subjects: P–C isotherm -- Crystal structure -- Superlattice structure -- X-ray diffraction -- Rietveld refinement; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.06.195
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: We synthesized the intermetallic compound PrCo3 with the PuNi3 -type structure. The structural parameters were refined by the Rietveld method. The refined lattice parameters were a = 0.5076(1) nm and c = 2.4831(6) nm. The pressure-composition (PC) isotherm of PrCo3 was measured at 413 K. The maximum hydrogen capacity reached 0.95 H/M. Two plateaus were observed in the absorption–desorption process. The hydrogenation properties were reversible. The structure change of the hydride phase was investigated by X-ray diffraction. The space group of the full hydride phase (PrCo3 H3.8 ) was determined to be R32; the metal sublattice of the original alloy (space group R-3m) transformed to R32 during the hydrogen absorption process. The volume expansions of the unit cell, and the CaCu5 -type and MgZn2 -type cells of the full hydride phase from the original alloy were 25.0%, 18.4%, and 22.7%, respectively. The structural change was accompanied by anisotropic lattice expansion. Highlights: The reversible hydrogen capacity of PrCo3 reached 0.95 H/M. The structure of PrCo3 H3.8 is described by space group R32. Crystal lattice of PrCo3 H3.8 expands anisotropically with increasing hydrogen.