All sites’ systematic non-stoichiometric regulation of ordering-related structure and microstructure for enabling ultralow dielectric loss and temperature stability in Ba(Mg 1/3 Nb 2/3 )O 3 perovskite ceramics

Non-stoichiometric design at distinct sites in Ba(Mg 1/3 Nb 1/3 )O 3 to regulate cation ordering, ordered domains, and grain size, revealing a critical grain-size effect that governs the coupled impact of ordering degree and grain boundaries to the Q × f .