A New Phase of Compound CaMnO2+δ

Abstract
A new phase of CaMnO2+δ was synthesized by a wet process, followed by calcining. The structure was determined to be orthorhombic, with these lattice constants: a=5.96, b=14.38, and c=5.72 Å. Phase transformations among CaMnO2+δ compounds were studied in various atmospheres, such as N2, CO2, and air.