Materials Data on Ca3Mn by Materials Project
Ca3Mn is alpha bismuth trifluoride structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded to four equivalent Ca and four equivalent Mn atoms to form a mixture of distorted edge, face, and corner-sharing CaCa4Mn4 tetrahedra. There are one shorter (3.45 Å) and three longer (3.47 Å) Ca–Ca bond lengths. There are one shorter (3.45 Å) and three longer (3.47 Å) Ca–Mn bond lengths. In the second Ca site, Ca is bonded in a distorted body-centered cubic geometry to eight equivalent Ca atoms. Mn is bonded in a body-centered cubic geometry to eight equivalent Ca atoms.
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