Dependence of the structure and properties of Ba6Co6O15+δCl on the starting materials

Structural refinements of Ba6Co6O15+δCl prepared using two different sources of barium oxide reveals that two different values of δ, 0.574(3) and 0.914(8), are obtained on synthesis at the same temperature in air. The refinements are based on powder X-ray diffraction data obtained with high intensity synchrotron radiation, performed to increase the sensitivity of the refinements to the oxygen contents. The magnetic and electronic properties of the materials, measured and reported here, support the differences in formula and structure but are not changed dramatically by the change in oxygen content.