Fig. 1: The structure of Ca6Ba(PO4)4O:Mn5+.
From: Mn5+-activated Ca6Ba(PO4)4O near-infrared phosphor and its application in luminescence thermometry
a Rietveld fits for Ca6Ba(PO4)4O, Rwp = 5.31%. b Rietveld fit for Ca6Ba(PO4)4O:Mn5+, Rwp = 8.59%. In each case the blue curve represents the observed pattern, the red curve is the calculated pattern and the difference curves are shown in grey, while blue tick marks represent the positions of the Bragg peaks. c The crystal structure of Ca6Ba(PO4)4O, with the unit cell viewed along the b-axis; d Geometries of two PO4 tetrahedra with average P–O bond lengths in Ca6Ba(PO4)4O:Mn5+
