The effect of Ca and Sr-doping on the structural electronic and optical properties of the cubic Ba1-xCaxTiO3 and Ba1-xSrxTiO3 (x=0. 4. 0. 6) mixed crystals was investigated using first-principles calculations based on density functional theory (DFT). https://www.globalspecialtyfoods.com/product-category/premium-clumping-cat-litter/