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Solid Ion Conductors under Pressure: In Situ Monitoring of the Tetragonal to Cubic Phase Transition of and
No full textThe solid electrolytes are promising candidates for sodium solid-state batteries due to their potential high ionic conductivities. Structural modifications of these materials can induce a tetragonal-to-cubic phase transition, either by increasing temperature or by aliovalent substitutions. In this study, we introduce pressure as an alternative approach to observe the tetragonal-to-cubic phase transition in these materials. In situ synchrotron high-pressure powder X-ray diffraction shows a tetragonal-to-cubic phase transition at pressures of 2.9 GPa for and 14.6 GPa for . Rietveld refinements and symmetry analysis provide insights into the displacive phase transition mechanism related to the motion of and the rotation of the tetrahedra. Density functional theory calculations confirm that the cubic phase becomes thermodynamically favorable under high pressure compared to the tetragonal phase. These findings highlight the importance of high-pressure considerations in tailoring the properties of ionic conductors, an area that remains underexplored
Rapid mineralization of mineral-bound carboxyl-carbon of salicylic acid and phenylalanine
No full textLigand-bound carboxylic acids are considered a stabilized fraction of mineral-adsorbed carbon in soil. Carboxyl-14C labeled phenylalanine or salicylic acid wereadsorbed onto goethite, kaolinite, or illite, and subsequently incubated in both loamy and sandy arable topsoil for three weeks. Contrary to our expectations, moremineral-adsorbed carboxyl-C was mineralized than remaining C in salicylic acid and phenylalanine irrespective of mineral type or soil due to competitive desorptionfollowed by preferential mineralization. Factors that control the desorbability of organic molecules are more important for their stabilization in the soil than sorption strength
Low Parsons–Zobel slope of metal–solution interfaces: A theoretical comparison of three causes
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