Physico-chemical Properties Of Ga₂O₃ Polymorphs

A comparative structural and spectroscopic study,combined with reactivity tests in?inverse?water-gas shift and methanol steam reforming reaction,has been performed on various Ga₂O₃ polymorphs with special focus on ?-Ga₂O₃ and s-Ga₂O₃ with the aim of highlighting the eventual intrinsic physico-chemical properties of the latter two.Using this comparative approach,the question whether 8-Ga₂O₃ in fact is a nanocrystalline modification of ?-Ga₂O₃,a mixture of s-Ga₂O₃ and ?-Ga₂O₃ or a single polymorphic form could be answered:Especially Raman and Infra-red measurements,alongside reactivity tests,indicate that ?-Ga₂O₃ exhibits lots of properties of ?-Ga₂O₃.In fact,particularly in Raman measurements it appears as a mixture of s-Ga₂O₃ and ?-Ga₂O₃.The outlined results in turn reveal the importance of a focused approach by combining different methods providing complementary information to resolve structural issues.