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Progress, Challenges, and Rewards in Probing Melt Dynamics, Configurational Entropy Change, and Topological Phases of Group V‐ and Group IV‐Based Multicomponent Sulfide Glasses
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-04-25 , DOI: 10.1002/pssb.202000116
Soumendu Chakravarty 1 , Badriah S. Almutairi 2 , Ralph Chbeir 3 , Shibalik Chakraborty 3 , Mathieu Bauchy 4 , Matthieu Micoulaut 5 , Punit Boolchand 3
Affiliation  

The observation of reversibility windows (RWs) in binary GexS100−x, AsxS100−x and ternary GexAsxS100−2x glass systems permits constructing a global topological phase diagram in the GeAsS composition triangle. The RW denotes glass compositions for which the enthalpy of relaxation at Tg vanishes, leading to thermally reversing glass transitions. The phase diagram permits delineating glass compositions that are in the flexible phase (FP), intermediate phase (IP), and the stressed rigid phase (SRP) for all ternary GexAsxS100−2x glass compositions. For the IP compositions examined, a general lowering of the molar volumes, Vm, is observed in relation to those for non‐IP compositions, giving rise to a volumetric window. Melt dynamics of IP compositions reveal a fragility index, m < 20, lower than that for non‐IP melts for which m > 20 displays a fragility window, underscoring in part the reason for the delayed homogenization of melts in these sulfide glasses. The observations of the three types of window characteristics of IP compositions are feasible only when the homogeneous bulk glasses are synthesized, in which the variance ⟨Δx⟩ in As and Ge concentrations, x, across batch compositions is less than 0.01%. This is established by Fourier transform–Raman profiling of each batch of composition that is synthesized.

中文翻译:

基于V组和IV组的多组分硫化物玻璃的熔体动力学,构型熵变化和拓扑相研究的进展,挑战和奖励

的可逆性窗口中的二进制葛观察(RWS)X小号100- X,作为X小号100- X和三元锗X作为X小号100-2 X玻璃系统允许在葛构建全局拓扑相图作为小号组成三角形。RW表示玻璃组合物,在玻璃组合物中,T g的弛豫焓消失,导致玻璃的热转变热反转。相图可以描绘出所有三元Ge x处于柔性相(FP),中间相(IP)和受压刚性相(SRP)的玻璃成分作为x S 100-2 x玻璃成分。对于所检查的IP组合物,相对于非IP组合物,其摩尔体积V m总体降低,从而产生了体积窗口。IP组合物的熔体动力学显示出脆性指数m  <20,低于非IP熔体的脆性指数,其中m  > 20显示出脆性窗口,这在一定程度上强调了这些硫化物玻璃中熔体均化延迟的原因。三种类型的IP组合物的窗口特征的观察是,只有当齐块状玻璃被合成可行的,其中,所述方差⟨Δ X ⟩在As和Ge浓度批料组合物中的x小于0.01%。这是通过对每批合成的成分进行傅里叶变换-拉曼分析来确定的。
更新日期:2020-04-25
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