Magnetic Susceptibility of Mercuric Oxide at Various Temperatures

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Abstract
Mercuric oxide exists in two forms, the red and the yellow oxides. Magnetic susceptibility determinations showed no appreciable difference between the two oxides; the red one has a mass susceptibility of (—0.2217±0.0002)·10—6 emu/g, while the yellow one has a slightly lower mass susceptibility of (—0.2165±0.0002)·10—6 emu/g at room temperature (25°C). The temperature variation of their mass susceptibility between room temperature (25°C) and about 300°C was also investigated. The general shape of the curve for the two oxides is essentially the same, namely, an increase in diamagnetism with rise in temperature followed by a mild drop and subsequently a sharp rise. The position of the peak occurs at about 50°C for the red oxide and at about 114°C for the yellow oxide. A tentative explanation of their behavior was given, based on impurity ionization.

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