La2XB3 (X = Cl,Br): A Novel Layered Structure with Planar Boron Nets of B3, B6 and B8 Rings |
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| Authors: | Hui‐Yi Zeng Mar'yana Lukachuk Hiroki Okudera Chong Zheng Hansjürgen Mattausch Arndt Simon Prof. Dr. Dr .h.c. mult. |
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| Affiliation: | 1. Stuttgart, Max‐Planck‐Institut für Festk?rperforschung;2. Stuttgart, Max‐Planck‐Institut für Festk?rperforschungMax‐Planck‐Institut für Festk?rperforschung, Heisenbergstr. 1, D‐70569 Stuttgart, Germany, Tel.: +49 (0)711 689 1641, Fax: +49 (0)711 689 1642 |
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| Abstract: | Two new layered rare earth boride halides, La2XB3 (X = Cl, Br) have been synthesized. They crystallize in the space group  (No. 174) with a = 7.872(1) Å, c = 8.219(2) Å, V = 441.1(1) Å3 for the chloride, and with a = 7.834(1) Å, c = 8.440(1) Å, V = 448.6(1) Å3 for the bromide compound, respectively. The crystals of La2ClB3 are twinned resulting in an apparent symmetry P6/mmm (No. 191). In the crystal structure of La2XB3, trigonal La6 prisms are condensed into sheets in the a‐b plane, and the halogen atoms X sandwich the La double layers. The connection of B atoms which center the prisms and rectangular prism faces leads to B nets of B3, B6 and B8 rings embedded between the La atom double layers. The chemical bonding is analyzed for the well ordered bromide, and the characteristic disorder in the chloride is discussed. |
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| Keywords: | Lanthanum Borides Halides |
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