manganese oxide

…magnetism in solids such as manganese oxide (MnO) in which adjacent ions that behave as tiny magnets (in this case manganese ions, Mn²⁺) spontaneously align themselves at relatively low temperatures into opposite, or antiparallel, arrangements throughout the material so that it exhibits almost no gross external magnetism. In antiferromagnetic materials,…

…examples of antiferromagnetic crystals are manganese oxide (MnO; T_N = 116 K), manganese sulfide (MnS; T_N = 160 K), and iron oxide (FeO; T_N = 198 K). Manganese oxide is an insulator since manganese atoms are divalent and oxygen atoms accept two electrons. The manganese ion has a fixed magnetic…

…hydrogen or carbon monoxide over manganese dioxide.

…with electrodes of zinc and manganese dioxide (e.g., the common flashlight dry cell), one finds that a chemical equivalent of zinc weighs 32.5 grams (1.4 ounces) and that of manganese dioxide about 87 grams (3.1 ounces). The discharge of one equivalent weight of each of these electrodes will cause 32.5…