Abstract
The previously reported compounds VP 4 and CoP 2, prepared at high pressure, were synthesized in well-crystallized form at ambient pressure by reaction of the elemental components in the presence of iodine. Their structures were refined from single-crystal X-ray diffractometer data to conventional residuals of R = 0.033 for VP 4 (CrP 4 type structure, 11 variables, 815 F values) and R = 0.019 for CoP 2 (arsenopyrite structure, 14 variables, 932 F values). VP 4 is paramagnetic and a metallic conductor. CoP 2 is a diamagnetic semiconductor with an activation energy of 0.34 eV. Chemical bonding and potential displacive phase transitions of these compounds are discussed.
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