Chromium(II) selenide is an inorganic compound with the chemical formula CrSe. It crystalizes in a hexagonal structure with space group P63/mmc. It is one of many related chromium-selenium phases, including , as well as , , , and . The compound has been described as an antiferromagnet, but its inverse magnetic susceptibility does not match the behavior expected for an antiferromagnet according to the Curie–Weiss law. One suggestion was that the Néel temperature is at 320 K, as the temperature where the compound has maximum specific heat. When synthesized as single atomic layer, CrSe is ferromagnetic, with a Curie Temperature of around 280 K.
References