New layer borate (Nd{sub 0.925}Na{sub 0.075})Nd[B{sub 9}O{sub 15}(OH){sub 2}]Cl{sub 0.85} . 2.65H{sub 2}O and its place in the structural systematics
- Moscow State University, Faculty of Geology (Russian Federation)
Crystals of a new aqueous rare-earth borate-(Nd{sub 0.925}Na{sub 0.075})Nd[B{sub 9}O{sub 15}(OH){sub 2}]Cl{sub 0.85} . 2.65H{sub 2}O, space group P2/n-are obtained under hydrothermal conditions. The crystal structure is determined by the heavy-atom method without preliminary knowledge of the chemical formula. The independent anionic radical is a new corrugated layer related to layer pentaborates. Layers related by centers of inversion form sheets. Nd and Cl atoms are located in the intersheet space and in the large voids of the sheet. One of the positions of both Nd and Cl atoms is isomorphously shared with Na atoms and H{sub 2}O molecules, respectively. The new borate is characterized as a polyborate (megaborate) containing the {l_brace}(4:3[2T + {Delta}] + 1[{Delta}]){sub {infinity}} + (5[3T + 2{Delta}]){sub {infinity}}{r_brace}{sub {infinity}{infinity}} complex anionic radical. The topological variants of the completion of the layer by additional triangles and the connection of layers into a framework are considered. The relationship between the new borate and the earlier studied LaB{sub 5}O{sub 8}(OH){sub 2} . 1.5H{sub 2}O framework borate is revealed.
- OSTI ID:
- 22054099
- Journal Information:
- Crystallography Reports, Vol. 55, Issue 5; Other Information: Copyright (c) 2010 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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