= Cerium magnesium nitrate
<Cerium magnesium nitrate> is a hydrated double nitrate salt, commonly written $\mathrm{Ce_2Mg_3(NO_3)_{12}\cdot24H_2O}$. The <cerium> ions give the crystal a low-temperature magnetic response useful in <temperature measurement>.https://trc.nist.gov/ThermoML/10.1016/j.jct.2016.10.036.html[ThermoML compound 7, cerium magnesium nitrate hydrate]{ref}
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.https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.21.597[Abstract: comparison of powdered and single-crystal cerium magnesium nitrate thermometers]{ref}
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