Nickel Oxide NiO Bookmark Quick Facts Composition Nickel II oxide Formula NiO Appearance Green crystalline solid Common Forms Powder tablets pellets Key Properties Semiconductor p type Wide bandgap High thermal stability Antiferromagnetic below 523 K Chemically stable in air Electrical Behavior Intrinsic p type semiconductor due to nickel vacancies Conductivity increases with temperature Used in transparent conducting films synthesis Applications Major component in nickel iron NiFe batteries cathode Active material in supercapacitors pseudocapacitance Gas sensing ethanol CO H2 Catalysis Electrochromic devices smart windows Varistors ceramic surge protectors Pigments ceramics glass Safety Handling Fine powder avoid inhalation skin contact Use PPE gloves mask goggles Not acutely toxic but potential carcinogen handle with care Synthesis Methods Thermal decomposition of nickel hydroxide carbonate nitrate Precipitation from nickel salts calcination Nickel plating anodization Nickel oxidation in air Physical Data Density 681 g cm Melting Point 1955 C Structure Cubic rock salt crystal lattice Color Opaque green

(nickel oxide nio)

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