Chromium(II) selenide is an inorganic compound with the

chemical formula In chemistry, a chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbol ...

CrSe. It crystalizes in a hexagonal structure with space group P6₃/mmc. It is one of many related Chromium-Selenium phases, including Cr₇Se₈, Cr₃Se₄, Cr_0.68Se, Cr₂Se₃, and Cr₅Se₈. The compound has been described as an

antiferromagnet In materials that exhibit antiferromagnetism, the magnetic moments of atoms or molecules, usually related to the spins of electrons, align in a regular pattern with neighboring spins (on different sublattices) pointing in opposite directions. ...

, but its inverse magnetic susceptibility does not match the behavior expected for an antiferromagnet according to the

Curie–Weiss law The Curie–Weiss law describes the magnetic susceptibility of a ferromagnet in the paramagnetic region above the Curie point: : \chi = \frac where is a material-specific Curie constant, is the absolute temperature, and is the Curie tempera ...

. One suggestion was that the

Néel temperature In physics and materials science, the Curie temperature (''T''C), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Cur ...

is at 320 K, as the temperature where the compound has maximum

specific heat In thermodynamics, the specific heat capacity (symbol ) of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capacity. Informally, it is the amount of heat t ...

. When synthesized as single atomic layer, CrSe is

ferromagnet Ferromagnetism is a property of certain materials (such as iron) which results in a large observed magnetic permeability, and in many cases a large magnetic coercivity allowing the material to form a permanent magnet. Ferromagnetic materials ...

ic, with a

Curie Temperature In physics and materials science, the Curie temperature (''T''C), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Cur ...

of around 280 K.

References

Chromium(II) compounds Selenides Nickel arsenide structure type {{Inorganic-compound-stub