Evolution, as a function of increasing calcium content, ( $x=0,0.2,0.4,0.6,0.8,1.0$), at room temperature, of the (a) unit-cell volume, (b) monoclinic angle ( $\beta$) and the (c) unit-cell parameters of the synthesized materials. Dotted line is a guide for the eyes.
Evolution, as a function of increasing calcium content, ( x=0,0.2,0.4,0.6,0.8,1.0), at room temperature, of the (a) unit-cell volume, (b) monoclinic angle ( \beta) and the (c) unit-cell parameters of the synthesized materials. Dotted line is a guide for the eyes.