Crystal structure of protactinium tetrabromide
Abstract
The crystal structure parameters for PaBr4(isostructural with ThCl4) have been determined from quantitative X-ray powder data and refined to R 0·123. The Pa–Br bond distances are 2·77 and 3·07 Å; a value of 1·63 Å is deduced for the covalent single-bond radius of PaIV.