Download e-book for iPad: The metal-hydrogen system by Yuh Fukai
By Yuh Fukai
Metal hydrides are of inestimable value for the way forward for hydrogen power. This distinct monograph offers a transparent and accomplished description of the majority homes of the metal-hydrogen method. The statistical thermodynamics is taken care of over a really wide variety of strain, temperature and composition. one other renowned characteristic of the publication is its elucidation of the quantum mechanical habit of interstitial hydrogen atoms, together with their states and movement. the real subject of hydrogen interplay with lattice defects and its materials-science implications also are mentioned completely. This moment variation has been considerably revised and updated.
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Extra info for The metal-hydrogen system
For hcp metals, very peculiar features have been found regarding the terminal solubility in Sc, Y and some heavy rare-earth metals, in which a solid solution coexists with a dihydride phase. In this section, we deal with cases in which the α phase coexists with the β phase of nearly ﬁxed composition, leaving aside the spinodal region, which has been treated in Sect. 3. The thermodynamics for the terminal solubility is as follows. 53). Besides, in view of small deviations from stoichiometry in the β phase in comparison to the α phase, the conﬁgurational entropy term for the β phase can be neglected.
In fact, this lattice distortion removes the degeneracy of the site energy in the original cubic lattice, allowing the occupancy of a certain interstitial sublattice among others. For example, in the β phase of the V–H(D) system (Fig. 3), one of the cube axes (Z axis) is elongated by about 10% by occupation of Oz sites, the energy of which has been lowered in turn by the overall tetragonal distortion. This particular example will be discussed more fully in Sect. 2. Hydrides in which H atoms are ordered on O sites in the bcc lattice include V2 H, V3 H2 , and VH (V2b Ho ,V3b Ho2 , and Vb Ho , respectively); those in 34 2 Statistical Thermodynamics of Binary M–H Systems which they are ordered on T sites include Nb4 H3 , NbH, Ta2 H, Ta4 H3 , and TaH (Nbb4 Ht3 , Nbb Ht , Tab2 Ht , Tab4 Ht3 , and Tab Ht , respectively).
131]. As an example, a part of the phase diagram of the Lu–H system is shown in Fig. 19.
The metal-hydrogen system by Yuh Fukai