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An automatic method of obtaining periodic bond chains (p.b.c.) in AaBb compounds is presented. The program analyses every crystallographic short direction and for each it makes systematic trials of every atom succession that could be a p.b.c. The chain is built up with the atoms at the smallest distance from the line considered to be the p.b.c. This program is applied to crystals of rutile, anatase and barite, and it gives all their known p.b.c.'s, plus another two in the case of barite.