Wulff construction of Y 2 Ti 2 O 5 S 2 equilibrium form under thermodynamic limits was created based on the surface energies and the bulk lattice. The central idea behind the prediction of particle shape based on Wulff constructions is that lower energy surfaces will be more likely to form than higher energy surfaces. As shown in Figure , this is indeed the case for Y 2 Ti 2 O 5 S 2 Wulff shape. Unsurprisingly, the (001) facet occupies by far the largest area, covering over 55% of the total area. The other 45% is composed of the (101) facet covering 30% and the (211) facet covering 15% of the area. The (100) surface does not feature on the Wulff shape despite its energy being lower than that of the (211) surface.