A synthesis strategy for various pseudo-vaterite LnBO_3 nanosheets via oxides-hydrothermal route

摘要

A series of pseudo-vaterite lanthanide orthoborates LnBO_3 (Ln = Sm, Gd, Dy, Er and Y) nanosheets are firstly prepared via an oxides-hydrothermal process, in which rare earth oxide Ln_2O3 and H_3BO_3 in stoichiometric are directly used as precursors. Some rare earth borates nanosheets are facilely obtained with thickness ca. 50 nm and sizes in region of 1-10 mu m. However, pure ErBO_3 and YBO_3 nanomaterials cannot be obtained unless EDTA is added into the reaction system. Ion radius is a critical influencing factor on the growth of the nanocrystals. Meanwhile, it is found the crystal growth can be modified by ions doped process. A possible growth mechanism of the pseudo-vaterite LnBO_3is discussed.