Hydride Formation in the TbNi0.4Co0.6-H2 System

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The hydrogenation of TbNi0.4Co0.6 was studied by means of neutron diffraction and calorimetric method with use of the differential heat-conducting Tian-Calvet type calorimeter. It was determined that TbNi0.4Co0.6H3.8 crystallized in orthorhombic CrB-type structure (S.G. Cmcm). The hydride formation is accompanied with strong lattice expansion. In the structure TbNi0.4Co0.6D3.4 deuterium atoms occupy tetrahedral 8f-intersices, trigonal bipyramidal 4c-interstices and octahedral 4b-interstices. Dependence of the differential molar enthalpy of absorption (ΔHabs) vs. the hydrogen concentration in the metallic matrix was obtained at 50°C. It was ascertained that in the range of 0<X<2.0 (X=H/ TbNi0.4Co0.6) ΔHabs =-102.0±2.3 kJ mol-1H2. The value of the integral enthalpy of hydrogen absorption by TbNi0.4Co0.6 equals -99.5kJ mol-1H2 for the composition TbNi0.4Co0.6H3.8.

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Periodical:

Solid State Phenomena (Volume 257)

Edited by:

Juan Bartolomé, Jose Ignacio Arnaudas, Larry R. Falvello

Pages:

43-46

DOI:

10.4028/www.scientific.net/SSP.257.43

Citation:

E. Anikina, Y. Yaropolov, V. Somenkov, V. Verbetsky, "Hydride Formation in the TbNi0.4Co0.6-H2 System", Solid State Phenomena, Vol. 257, pp. 43-46, 2017

Online since:

October 2016

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$35.00

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