Entropic stabilization and retrograde solubility in Zn4Sb3
نویسندگان
چکیده
Zn4Sb3 is shown to be entropically stabilized versus decomposition to Zn and ZnSb through the effects of configurational disorder and phonon free energy. Single-phase stability is predicted for a range of compositions and temperatures. Retrograde solubility of Zn is predicted on the two-phase boundary region between Zn4Sb3 and Zn. The complex temperature-dependent solubility can be used to explain the variety of nanoparticle formation observed in the system: formation of ZnSb on the Sb-rich side, Zn on the far Zn-rich side, and nano-void formation due to Zn precipitates being reabsorbed at lower temperatures.
منابع مشابه
Serratia marcescens B4A chitinase thermostability enhancement by S390I QuikChange site directed mutagenesis
Thermostable chitinases are useful for industrial and biotechnological applications. This paper reports the stabilization of chitinase from Serratia marcescens B4A through rational mutagenesis. Changing of Ser 390 to Ile in S. marcescens. The stabilization was enhanced through entropic stabilization by reduction of the loop length and also by increasing of the beta chain length. With this repla...
متن کاملRetrograde solubility of formamidinium and methylammonium lead halide perovskites enabling rapid single crystal growth.
Here we show the retrograde solubility of various hybrid perovskites through the correct choice of solvent(s) and report their solubility curves. Retrograde solubility enables to develop inverse temperature crystallization of FAPbX3 (FA = HC(NH2)2(+), X = Br(-)/I(-)). FAPbI3 crystals exhibit a 1.4 eV bandgap--considerably narrower than their polycrystalline counterparts.
متن کاملEffect of disorder on the thermal transport and elastic properties in thermoelectric Zn4Sb3
Zn4Sb3 undergoes a phase transition from to phase at T1 250 K. The high temperature -Zn4Sb3 phase has been widely investigated as a potential state-of-the-art thermoelectric TE material, due to its remarkably low thermal conductivity. We have performed electronic and thermal transport measurements exploring the structural phase transition at 250 K. The to phase transition manifests itself by an...
متن کاملFast direct synthesis and compaction of homogenous phase-pure thermoelectric Zn4Sb3.
Zn4Sb3 is among the cheapest high performance thermoelectric materials, and it is made of relatively nontoxic elements. Strong activities are aimed at developing commercial power generation modules based on Zn4Sb3 making it vital to develop fast reliable synthesis processes for high-quality material. Here direct synthesis and compaction of homogeneous phase-pure thermoelectric Zn4Sb3 by spark p...
متن کاملOn the temperature coefficient of the solubility of some glycyl peptides in water-ethanol mixtures.
The solubility of glycine, diglycine, and triglycine was investigated in water-ethanol mixtures (20% and 50% ethanol) as a function of the temperature. The transfer free energy, @go,,,, for the peptide group was evaluated and the separate enthalpy and entropy components of the transfer process were determined. In 20% ethanol solutions, the hypothesis of additivity of the contribution of various...
متن کامل