“…M agnesia and magnesia‐based compositions are widely used in agricultural (e.g., in additives to livestock feed, in fertilizers, as a carrier for pesticides), pharmaceutical (e.g., as a nutrient supplement, antacid, and in ointments and cosmetics), electrical and thermal (e.g., as a cell separator in molten salt‐based batteries, as electrical insulation for heating elements), chemical/petrochemical (e.g., as a catalytic substrate for the oxidative coupling of methane; as a thickener catalyst, acid acceptor, or filler in the production of plastics), environmental (e.g., for acid neutralization or heavy‐metal precipitation from wastewater streams; for sulfur dioxide removal from gaseous emissions), cement, and steel manufacturing (e.g., for refractories; in oxychloride cements for fireproofing of flooring, wallboards, and tiles; and as an annealing separator in the fabrication of high‐silicon steel sheets for magnetic cores), and numerous other applications 1–14 . Nanocrystalline magnesia‐based materials have exhibited enhanced catalytic/chemical, biological, optical, and mechanical properties 15–27 .…”