Magnetic Gouy balance

A. Saunderson, A permanent magnet Gouy balance, Physics Educ. 3 272-273 (1969). 

Gouy balance A balance for the determination of magnetic susceptibility. The sample is weighed in and out of a magnetic field and the susceptibility is calculated from the difference in weights. 

Compounds with unpaired electrons are paramagnetic. They tend to move into a magnetic field and can be identified because they seem to weigh more in a Gouy balance when a magnetic field is applied than when it is absent. Paramagnetism arises from the electron spins, which behave like tiny bar magnets that tend to line up with the applied field. The more... 

A Gouy balance is used to observe the magnetic character of a sample by detecting the extent to which it is drawn into (paramagnetic substances) or driven out of (diamagnetic substances) a magnetic field. 

A simple apparatus used to measure magnetic susceptibilities (a Gouy balance) is shown in Figure 25-1 ... 

Gouy balance (comprising a magnet, power supply if needed, suitably modified analytical balance) glass-stoppered Gouy tube several 100-mL volumetric flasks and glass-stoppered 200-mL flasks thermometer Westphal balance or hydrometer (optional). 

When a substance is subjected to magnetic field H, and a magnetization I is induced. The ratio I/H is called the volume susceptibility k and can be measured by a number of techniques, including Gouy balance method, Faraday method and an nmr method. The volume susceptibility is related to the gram susceptibility c and the molar susceptibility cm. 

Molecular magnetism Gouy magnetic balance Used for determining the number of unpaired electrons... 

The popular experimental techniques involve Faraday or Gouy balance measurements where the quantity being measured is the force acting on a body when it is in the magnetic field... 

Figure 12.1 The weak magnetic properties of a solid can be determined by its behaviour in the field generated by an electromagnet, in a Gouy balance (a) sample with electromagnet turned off (b) diamagnetic sample with electromagnet turned on (the sample appears to weigh less) and (c) paramagnetic sample with the electromagnet turned on (the sample...

A Gouy balance is a simple tool that can be used to measure the magnetism of a material. There are two ways in which a complex responds in a magnetic... 

The most common way to ascertain the magnetic properties of materials is to measure their molar magnetic susceptibility, The magnetic susceptibility is related to the effective magnetic moment according to Equation (15.10) and is mea-sured using either a Gouy balance or an Evans balance. 

The Gouy balance can readily be adapted for high-pressure measurements. In this case, the high-pressure sample tube ( bomb ) must be made of mechanically strong, but weakly magnetic material, e.g., berylco-25 alloy. The sample, normally in solution, is pressurized in the tube, locked, and put in the Gouy balance. 

Magnetic measurements with a Gouy balance reveal diamagnetic bdiaviour for 3,3, and 3, who eas complex 3 exhibits e.s.r. response in a firazei glass (CH Qj-THF) at 105 K. The spectrum consists of a broad line with a g value of 1.997 (width 1(X) G, no hypoiine splitting observed). 

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