Apparatus for the Accurate Measurements of Magnetic Susceptibility with the Help of a Vacuum Electrobalance
Best conditions for magnetic susceptibility measurements of diamagnetic or slightly paramagnetic fluids are stated. It is pointed out that the classical Gouy method is the most favorable.
A simple apparatus consisting essentially of a slightly modified Cahn RH Electrobalance, a permanent magnet, and thermostatic devices, is described. This apparatus can operate under high vacuum or in controlled gas atmosphere from −30 to 150 C with an accuracy about 2 × 10−10 emu even on samples with a total weight greater than 50–60 g. Operating procedures are discussed to minimize experimental errors. The apparatus was used for a new determination of magnetic susceptibility temperature coefficient of water over the temperature range 0–80 C; a comparison between the results obtained and the existing data is reported. Finally, the use of this apparatus is suggested for simultaneous adsorption and magnetic-susceptibility change measurements on powders which possess no paramagnetism.
KeywordsMagnetic Susceptibility Magnetic Susceptibility Measurement Sample Suspension Thermostatic Chamber Vacuum Bottle
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