Abstract
The oxygen rich corner of the ZrO 2-WO 3-WO 2 system has been studied by means of x-ray powder diffraction and electron microscopy at room temperature of specimens quenched from the preparation temperatures of 1000°C and 1100°C. Zirconium tungsten bronzes of formula Zr xWO 3 are formed for 0<x<0.075. The symmetry of the unit cell increases with rising zirconium content x from monoclinic through orthorhombic to tetragonal (pseudocubic) at approximate x-values of 0.027 and 0.047, respectively. The zirconium atoms enter the empty cages in the tungsten trioxide structure in the same manner as for tungsten bronzes of the perovskite type. No evidence was observed for the formation of any crystallographic shear planes in these bronzes.
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