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- W2016478116 abstract "Abstract MgB 2 and MgB 4 have been prepared at high temperature in sealed molybdenum vessels from mixtures of the elements. The utilization of an excess of metal in the vessel generates a pressure of magnesium vapor which inhibits thermal decomposition of the compounds during the synthesis. The structure of MgB 4 has been established from single crystal data collected on an automatic diffractometer. MgB 4 is orthorhombic, space group Pnam with a = 5.464; b = 7.472; c = 4.428A and Z = 4. The structure of MgB 4 , is based on chains of boron pentagonal pyramids in which the averaged BB bond is 1.787 A. Interchain BB bonds of 1.730 A are responsible for the three-dimensional boron framework. The Mg atoms, located in tunnels, form zigzag chains. The structure of MgB 4 is compared to those of ThB 4 and CrB 4 ; it is concluded that the size of the metal atom plays an important role in the nature of the boron framework which exists. In MgB 4 , the fundamental unit of the boron skeleton is a pentagonal pyramid; a new feature, in boron-rich borides where this type of coordination polyhedron was previously found only in B 12 icosahedra." @default.
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- W2016478116 date "1973-09-01" @default.
- W2016478116 modified "2023-10-14" @default.
- W2016478116 title "Sur le diborure et le tétraborure de magnésium. Considérations cristallochimiques sur les tétraborures" @default.
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- W2016478116 doi "https://doi.org/10.1016/0022-4596(73)90022-4" @default.
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