论文标题
相图和订单 - disorder转换y $ _ {0.9} $ gd $ _ {0.1} $ fe $ _ {2} $ h $ _ {x} $ hydrides（x $ \ le $ 2.9）
Phase diagram and order-disorder transitions in Y$_{0.9}$Gd$_{0.1}$Fe$_{2}$H$_{x}$ hydrides (x $\le$ 2.9)
论文作者
论文摘要
y $ _ {0.9} $ gd $ _ {0.1} $ fe $ _ {2} $，在C15立方结构中结晶，最多可吸收5 h/f.u。它的压力组合等温线显示了与具有不同晶体结构的几种氢化物存在相关的多帕龙行为。在室温下y $ _ {0.9} $ gd $ _ {0.1} $ fe $ _ {2} $ h $ _ {x} $ hydrides（2.9 $ \ le $ x $ \ le $ 5 $ 5）在三个阶段中结晶的三个阶段，具有立方结构（C1，C2和C3），两种阶段（C1，C2和C3），或单阶段的结构（或MONOCLINIC结构）（或M1和M1）和M1和M1和M1和M1和2 （O），以下序列增加了H浓度：C1，M1，C2，M2，C3，O。每个相在H均匀性范围内作为单相存在，并且它们通过两相域将它们彼此分离。晶体对称性的降低与各种氢秩序有关，使其内部位点。通过将立方C2相的立方细胞参数加倍来索引弱的上层建筑峰。加热后，单斜晶M1和M2以及立方C2相向无序的立方结构cdis进行订单disorder（O-D）过渡。这些O-D转变具有热滞后作用。立方C3和正骨O相变成无序的立方相，并伴有H解吸。
Y$_{0.9}$Gd$_{0.1}$Fe$_{2}$, which crystallizes in a C15 cubic structure, can absorb up to 5 H/f.u. and its pressure-composition isotherm displays a multiplateau behavior related to the existence of several hydrides with different crystal structures. At room temperature Y$_{0.9}$Gd$_{0.1}$Fe$_{2}$H$_{x}$ hydrides (2.9 $\le$ x $\le$ 5) crystallize in three phases with cubic structure (C1, C2 and C3), two phases with monoclinic structures (M1 and M2), and one phase with orthorhombic structure (O), with the following sequence for increasing H concentration: C1, M1, C2, M2, C3, O. Each phase exists as single phase within a H homogeneity range, and they are separated from each other by two-phase domains. The reductions of crystal symmetry are related to various hydrogen orders into interstitial sites. Weak superstructure peaks were indexed by doubling the cubic cell parameter of the cubic C2 phase. Upon heating, the monoclinic M1 and M2 and the cubic C2 phases undergo order-disorder (O-D) transitions toward a disordered cubic structure CDis. These O-D transitions are reversible with thermal hysteresis effects. The cubic C3 and orthorhombic O phases transform into a disordered cubic phase accompanied by H desorption.
