来源：Science DirectThe use of rare earth compounds as ceramic coatings to protect engine turbines blades from chemical degradation has been widely studied in the last two decades. After interaction with CMAS (CaO-MgO-Al2O3-SiO2) type liquid silicates, these materials lead to the formation of silicate phases (e.g. apatite, cyclosilicate, garnet, etc.). Since 2022, the cyclosilicate Ca3RE2(Si3O9)2 structure is only proven with RE=Y, Nd, Sm, Gd, Dy and Yb. Special attention is given here to the case of an equimolar dual rare earth cyclosilicate. Indeed, its existence is proven here for the first ti...
Release time:
2026
-
10
-
23
viewed：0
Mechanisms of rare earth element and aluminum leaching with magnesium sulfate based on coupled seepage–chemical–diffusion simulations in microporous networks来源：Science DirectIn situ leaching of ionic rare earth ore by magnesium sulfate (MgSO4) generally involves long leaching cycles, low leaching rates, low rare earth element concentrations and high contents of impurity ions in the leachate liquor. In this paper, on the basis of the microporous network of rare earth ores and theories of fluid dynamics, chemical reaction kinetics, and mass transfer, we adopt coupled seepage–chemical–diffusion s...
Release time:
2026
-
10
-
22
viewed：0
来源：Science DirectRare-earth mono-nitrides (REN) are important rare-earth compounds whose structural stability and electronic structure are strongly influenced by localized 4f states. In this work, a first-principles investigation is carried out on NdN, PmN, SmN, EuN, and GdN to examine their structural stability and electronic structure. Density Functional Theory (DFT) calculations using the Quantum Espresso package are employed to investigate the rocksalt (Fm–3m) and CsCl-type (Pm–3m) crystal phases. The calculated lattice parameters are compared with available experimental and theoretical va...
Release time:
2026
-
10
-
22
viewed：0
来源: Science DirectThe reason for the higher extraction rate of light rare earth elements (LREY) than that of heavy rare earth elements (HREY) during the extraction of rare earth elements (REY) from coal gangue (CG) by the calcination-acid leaching method has rarely been studied in depth. Based on the identification of rare earth minerals in CG, rare earth minerals were synthesized, and calcination-acid leaching experiments were carried out to explore differences in leaching reaction mechanisms between LREY and HREY. X-ray powder diffraction (XRD) analysis shows that rare earth fluorocarbonate ...
Release time:
2026
-
10
-
21
viewed：0