Combining ionic liquids with microwave heating allows to make otherwise difficult to obtain solid solutions of perovskites. Making a solid solution of BaSnO3 and BaZrO3 allows for band gap tuning, an important aspect for photocatalysis.
Read more about it here: Synthesis and Exploration of Barium Stannate–Zirconate BaSn1–xZrxO3 (0 ≤ X ≤ 1) Solid Solutions as Photocatalysts