Na4 Ni4 P4 O16

Na₄Ni₄P₄O₁₆ is an inorganic nickel phosphate compound with a layered or framework crystal structure that exhibits semiconductor behavior. This is primarily a research material studied for its potential in energy storage, catalysis, and electronic applications rather than a commodity engineering material. Interest in nickel phosphate semiconductors stems from their tunable band gaps, ion-transport properties, and possible use in next-generation batteries, electrochemical devices, and heterogeneous catalysts where nickel redox activity and phosphate framework flexibility offer advantages over conventional oxide or sulfide alternatives.