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Software has been developed for exhaustive searches of crystal-structure databases to find all orientations of all known compounds that match the lattice of any plane of any desired epitaxial deposit. The program provides for screening by crystal symmetry, orientation, index and match range limits, type of compound, and mismatch tolerances. Since almost any search yields hundreds to thousands of candidate substrates, it has become necessary to develop screening procedures to reduce the large number of entries to a small list of available candidate materials with a reasonable likelihood of favorable results. The present paper concerns the particular problems involved in cases, such as protein crystal growth on inorganic substrates, where the unit parallelogram of the material to be deposited is far larger than those of the candidate substrates. These problems include selection of deposit and substrate orientations, types of lattice match, multiple-orientation lattice matches, feasibility of synthesis, and chemical/physical compatibility. |
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