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Rich coordination of Nd3+ in Mg2Nd13(BO3)8(SiO4)4(OH)3, derived from high-pressure/high-temperature conditions
Shijun Wu1, Philip Kegler, Shuao Wang
1Institut für Geowissenschaften, Universität zu Kiel, 24118 Kiel, Germany.
Abstract:
A neodymium borosilicate, Mg(2)Nd(13)(BO(3))(8)(SiO(4))(4)(OH)(3) (MgNdBSi-1), was obtained from a high-temperature (1400 °C), solid-state reaction under high-pressure conditions (4.5 GPa). MgNdBSi-1 contains six different types of Nd(3+) coordination environments with three different ligands: BO(3), SiO(4), and OH groups. Mg(2+) cations are only bond to BO(3) 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(3) rings.
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