Rich Coordination of Nd<sup>3+</sup> in Mg<sub>2</sub>Nd<sub>13</sub>(BO<sub>3</sub>)<sub>8</sub>(SiO<sub>4</sub>)<sub>4</sub>(OH)<sub>3</sub>, Derived from High-Pressure/High-Temperature
Conditions
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Abstract
A neodymium borosilicate, Mg<sub>2</sub>Nd<sub>13</sub>(BO<sub>3</sub>)<sub>8</sub>(SiO<sub>4</sub>)<sub>4</sub>(OH)<sub>3</sub> (<b>MgNdBSi-1</b>), was obtained from a high-temperature
(1400
°C), solid-state reaction under high-pressure conditions (4.5
GPa). <b>MgNdBSi-1</b> contains six different types of Nd<sup>3+</sup> coordination environments with three different ligands:
BO<sub>3</sub>, SiO<sub>4</sub>, and OH groups. Mg<sup>2+</sup> cations
are only bond to BO<sub>3</sub> groups and form porous two-dimensional
layers based on 12-membered ring fragments. Surprisingly, the OH groups
are retained at high temperature and reside at the center of Mg–BO<sub>3</sub> rings
