Hence, the properties of the solid solution can be tuned over a wide range of dopant concentrations while remaining within the field of its phase stability. Examples of materials interesting from the point of view of their semiconducting properties are ZnO solid solutions with magnesium oxide and nickel oxide . The research is developing in two directions: epitaxial stabilization of rs-ZnO in thin films on oriented substrates and high-pressure phase transition of wurtzite ZnO into cubic one .