New PDF release: An introduction to crystal chemistry

By Robert Crispin Evans

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G. there is no advantage in using any form of centred cell for a triclinic structure), and the essentially different possible combinations of lattice symmetry with primitive and centred cell choices leads to 14 distinct results, known as the 14 Bravais lattices (strictly speaking, this term is incorrect, as it is the unit cell and not the lattice that is centred). 2 as ‘cell types’. 4 Symmetry in the solid state The impossibility of having some kinds of symmetry element, such as a five-fold rotation axis, in the crystalline solid state might seem to reduce the types of symmetry available in crystals compared with individual molecules.

2 still apply. Unit cells with one lattice point are referred to as primitive (P), and those with more than one lattice point are called centred. Different kinds of centring are possible in the various crystal systems, and these may involve lattice points at the centres of opposite pairs of faces (A, B, or C depending on which faces are centred), at the centres of all faces (F), or at the body centre of the cell (I). We omit here consideration of alternative cell choices for some trigonal structures (R for rhombohedral); the treatment needed is more than completeness is worth.

One consequence of this is that crystallization conditions must be controlled to give only one crystal in that part of the tube that will be within the X-ray beam. Once crystals have grown it is usually impossible to separate them physically. Unlike crystal growth from solution there is essentially only one variable, namely the temperature of the sample. However, there are several ways to adjust this and the method can be chosen to give coarse or fine control. A typical strategy for crystal growth involves the establishment and manipulation of a stable interface between liquid and solid phases.

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An introduction to crystal chemistry by Robert Crispin Evans

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