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Synthesis and crystal structure of new layered BaNaSc(BO3)2 and BaNaY(BO3)2 orthoborates |
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| Authors: | Yurii V Seryotkin Vladimir V Bakakin Nadezhda G Kononova Konstantin A Kokh |
| Institution: | a Institute of Geology and Mineralogy RAS, 3, Koptyuga avenue, 630090 Novosibirsk, Russia b Novosibirsk State University, 2, Pirogova street, 630090 Novosibirsk, Russia c Institute of Inorganic Chemistry RAS, 3, Lavrentieva avenue, 630090 Novosibirsk, Russia d Institute of Solid State Chemistry and Mechanochemistry RAS, 18, Kutateladze street, 630128 Novosibirsk, Russia |
| Abstract: | Crystals of two new layered BaNaSc(BO3)2 (I) and BaNaY(BO3)2 (II) orthoborates are grown from the melt-solution by the spontaneous crystallization onto the platinum loop. Single crystal X-ray analysis showed that the compounds are isostructural with the space group R3¯, a=5.23944(12) and 5.3338(2) Å, and c=34.5919(11) and 35.8303(19) Å for I and II, respectively, Z=6. The distinctive feature of the structure is the close-packed composite anion-cation (Ba,Na)(BO3) layers. The layers are combined into the base building packages of two types: {M3+Ba2+(BO3)3−]2}+ and {M3+Na+(BO3)3−]2}−, where M is Sc or Y. Neutral-charge two-package (four-layer) blocks are stacked by the rhombohedral principle into twelve layers of the cubic packing. |
| Keywords: | Layered orthoborates Melt-solution crystallization Single crystal X-ray analysis Unilateral coordination of Na |
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