Abstract
Crystallographic changes in several irradiated metal boride systems were studied by x-ray diffraction techniques. Three structures were investigated quite extensively and a fourth examined in a cursory manner. Irradiation damage can be related to structure. The relationship does not depend primarily upon the crystal system, but rather upon the strength of the structure bonds. The metal diborides with their tightly bonded hexagonal structures are most resistant to radiation damage. The hexaborides on the other hand, have a loosely bonded cubic structure and arc extensively damaged by radiation. The tetraborides are intermediate in bond lengths and also are intermediate in structure damage. A very limited study was made of irradiated dodecaborides. This face-centered cubic structure has an intermediate bond length between metal and boron atoms but a long bond length between metal atoms. The damage to this structure was apparently quite extensive as determined from the limited data available. (auth)
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