Defects and Defect Association Determine the Actual Entropy of Perovskites Derived from Lanthanum–Calcium Ferrite来源：ACS PublicationsPerovskites La1/2Ca1/2Mn1/3Fe1/3Co1/3O3−δ and iron-rich La3/4Ca1/4Mn1/4Fe1/2Co1/4O3−δ with five cations distributed through the A (La and Ca) and B (Mn, Fe, and Co) positions have been prepared by the combustion method. The corresponding nominal configurational entropies are 1.79R for the former and 1.61R for the latter. The actual configurational entropy may vary from these values due to metal ordering and the presence of oxygen vacancies; this is observed for th...
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2025
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来源：ACS PublicationsSolid-state sodium batteries operating at ambient temperatures are promising alternatives to liquid electrolyte batteries, offering improved safety and higher energy density. Among solid-state electrolytes, the ceramic Na-conducting electrolyte Na5YSi4O12 (N5) stands out due to its high Na-ion conductivity, wide electrochemical stability window, and compatibility with high-energy-density cathodes. However, achieving high ionic conductivity at room temperature remains a challenge. In this study, the effect of La doping on the electrochemical properties of an N5 ceramic electr...
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2025
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来源：ACS PublicationsThe oxidation state +2 is of interest in rare-earth chemistry since it allows these conventionally redox-inactive metals to be used as reducing agents. However, the divalent oxidation state is difficult to form for most rare-earth elements, and the ensuing compounds are often unstable. Here, we describe an approach to rare-earth reduction chemistry that circumvents the divalent oxidation state by using compounds of trivalent rare earths that store reducing electrons on the dinitrogen ligand [N2]2–, akin to “masked” divalent reactivity. Thus, the dinitrogen complexes [(C...
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2025
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来源：ACS PulicationsGadolinium-based metal–organic frameworks (MOFs) are attractive due to their potential magnetic applications such as magnetic refrigeration, magnetic resonance imaging, and quantum information science. In this work, Gd3+-based MOFs containing binuclear metal nodes and fluorinated hexaclusters have been prepared exhibiting paramagnetic behavior, and their crystal structures were obtained. A two-dimensional MOF (Gd-BCA-2D) having the sql topology was prepared by the hydrothermal reaction of Gd3+ and bicinchoninic acid (BCA). A fluoro-bridged hexacluster-based MOF (Gd-BCA-3D) ha...
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2025
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