According to the difference in the solubility of double sulfates precipitation, REEs can be divided into the following three groups: (1) the cerium group (La, Ce, Pr, Nd, and Sm), which exhibits insoluble double sulfates precipitation; (2) the terbium group (Eu, Gd, Tb, and Dy), ...
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2 School of Engineering, Polytechnic of Porto (ISEP), 4200-072 Porto, Portugal; fgs@isep.ipp.pt * Correspondence: absa@isep.ipp.pt; Tel.: +351-228-340-500 Received: 15 September 2018; Accepted: 2 November 2018; Published: 14 November 2018 Abstract: Physical vapour deposition (PVD) is ...
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