Synchrotron Radiation Applied to Computer Indexing
- 1 January 1986
- journal article
- Published by Cambridge University Press (CUP) in Advances in X-ray Analysis
- Vol. 30, 383-388
- https://doi.org/10.1154/s0376030800021522
Abstract
Synchrotron radiation was used to obtain a high-resolution powder diffraction pattern of the high-density form of BeH2, a material whose unit-cell dimensions have not previously been determined. The observed d-spacing values were presented to three different computer indexing programs. All three programs returned as best solution a body-centered orthorhombic unit cell with a = 9.082, b = 4.160, c = 7.707 Å and V = 292 Å3. Interpretation of the three-dimensional Patterson led to 12 BeH2 molecules per unit cell; thus, the theoretical density is 0.755 g/cm3. The molecular structure is based on a network of corner-sharing BeH4 tetrahedra rather than flat, infinite chains with hydrogen bridges previously assumed.Keywords
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