Thermodynamics of processes of hydrogen sorption by hydrides of intermetallic compounds of CrB structural type
摘要:
The intermetallic compounds (IMCs) HfNi, ZrNi, HfCo and ZrCo are studied by thermoanalytical methods. The thermodynamic characteristics calculated from the van't Hoff equation and obtained by the calorimetric method are compared with literature data. The dependence of the partial molar enthalpy on the IMC hydrogen content has a tendency to decrease with increasing hydrogen content in the a solution region; in the region near the alpha-(alpha + beta) and (alpha + beta)-beta boundaries there is a discontinuity; in the region of two-phase coexistence DELTA-HBAR(H) does not depend on the IMC hydride hydrogen content; during the formation of a new phase (monohydride, beta-hydride) DELTA-HBAR(H) increases.
The Thermodynamic Characterization of ZrCo–H, HfCo H, HfNi H and Zr 1–x HfxNi(Co) Alloy–H Systems
作者:Ted B. Flanagan、Hak Noh、Suifang Luo
DOI:10.1016/j.jallcom.2016.03.207
日期:2016.8
ZrCo and HfCo intermetallic compounds have the same cubic (CsCl-type) structure and their ternary (Zr1-xHfx)Co alloys are also cubic. ZrNi and HfNi intermetallic compounds have the orthorhombic structure (CrB-type) and the ternary (Zr1-xHfx)Ni alloys also have this structure. Thermodynamic data for hydride formation and decomposition in ZrCo, HfCo and HfNi intermetallic compounds have been determined from reaction calorimetry and from pressure-composition isotherms. Thermodynamic data have been determined for the three ternary alloys: (Zr0.75Hf0.25)Co, (Zr0.50Hf0.50)Co, and (Zr0.25Hf0.75)Co and the four ternary alloys: (Zr0.875Hf0.125)Ni, (Zr0.75Hf0.25)Ni, (Zr0.50Hf0.50)Ni, and (Zr0.25Hf0.75)Ni. This offers the opportunity to learn how the thermodynamic properties of the ternary alloy-H systems change with the stoichiometry of alloys with the same structure. (C) 2016 Elsevier B.V. All rights reserved.
Hydrogen absorption in various zirconium- and hafnium-based intermetallic compounds
作者:R.M. Van Essen、K.H.J. Buschow
DOI:10.1016/0022-5088(79)90178-4
日期:1979.4
Consistent partial structure factors for amorphous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>0.33</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Zr</mml:mi></mml:mrow><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Hf</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>0.67</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>using x-ray and neutron diffraction
作者:Yan Xu、W. B. Muir、Z. Altounian、W. J. L. Buyers、R. L. Donaberger
DOI:10.1103/physrevb.53.8983
日期:——
We have determined all three partial radial distribution functions for amorphous Ni0.33Zr0.67. TWO independent sets of (Faber-Ziman) partial structure factors were obtained, one from x-ray diffraction on seven alloys with Hf isomorphoudy substituted for Zr and the other from combined x-ray and neutron diffraction on Ni0.33Zr0.67 and Ni0.33Hf0.67. The results are in agreement to better than 4%, Our study confirmed the reliability of the isomorphous substitution method in evaluating the partial structure factors of amorphous Ni-Zr(Hf) alloys providing that the size difference between Hf and Zr is taken into account. As a result, we have derived the Ni-Ni correlations for this composition. The sensitivity of the neutron structure factor to the light Ni atoms has revealed evidence for a Ni-Zr-Ni correlation beyond the first-neighbor shell.
Investigation of the thermal stability and crystallization process of amorphous Hf0.67Co0.33 − xNix alloys with 0 ⩽ ⩽ 0.33 by differential scanning calorimetry and X-ray diffraction
作者:Kjell Jansson、Mats Nygren
DOI:10.1016/0022-5088(91)90160-6
日期:1991.8
The melt-spinning technique was used to prepare amorphous Hf0.67Co0.33-xNi(x) alloys with compositions x = 0.00, 0.06, 0.11, 0.165, 0.22, 0.27 and 0.33. The crystallization process of these alloys was monitored by differential scanning calorimetry and X-ray diffraction. The crystallization temperature T1 was 776 K for x = 0.00 and decreased from 787 K to 772 K with increasing x for 0.06 less-than-or-equal-to x less-than-or-equal-to 0.33. The heat of crystallization DELTA-H1 was found to decrease with increasing x values. Amorphous Hf0.67Co0.33-xNi(x) alloys with 0.00 less-than-or-equal-to x < 0.165 crystallized directly to the thermodynamically stable phase with cubic Ni2Ti-type structure. Amorphous Hf2Ni crystallized to the tetragonal Al2Cu-type structure, while a two-phase region was observed for 0.165 less-than-or-equal-to x < 0.33. The activation energies for the crystallization processes, evaluated by the Kissinger method, increased almost linearly with x from 286 kJ mol-1 for Hf2Co to 488 kJ mol-1 for Hf2Ni.
Lunin; Solovetskii, Kinetics and Catalysis, <hi>1985</hi>, vol. 26, # 3 pt 2, p. 603 - 607