Cerium magnesium nitrate is a hydrated double nitrate salt, commonly written . The cerium ions give the crystal a low-temperature magnetic response useful in temperature measurement.[ref]
https://trc.nist.gov/ThermoML/10.1016/j.jct.2016.10.036.html. ThermoML compound 7, cerium magnesium nitrate hydrate
In a magnetic thermometer, a measured magnetic susceptibility serves as a temperature-dependent signal. A 1968 comparison found a small offset between powdered and single-crystal thermometers, showing that sample form and calibration matter even for the same salt.[ref]
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.21.597. Abstract: comparison of powdered and single-crystal cerium magnesium nitrate thermometers
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