Measuring paramagnetism 3 – a portable instrument

In Part 2 I described a flat coil sensor which changes inductance according to the magnetic susceptibility of what is in front of it. To make this useful in the field I need something to display the change. I was going to count the high-frequency microcontroller clock over, say 500 periods of the low-frequency sensor … Continue reading “Measuring paramagnetism 3 – a portable instrument”

Measuring paramagnetism 2 – a new sensor

Part 1 Since I will be taking the sensor to the rock I’m going to temporarily give up on getting an absolute measurement, and take a leaf out of Bartington’s book from last time and use a flat coil. I will never be able to contain the sample in the magnetic field[ref]unless I grind a … Continue reading “Measuring paramagnetism 2 – a new sensor”

Measuring paramagnetism

There are two approaches to measuring paramagnetism that seem to be common. One is to use a balance to measure the slight attraction to a magnet – put sample in a balance, apply magnetic field, look for difference in weight of sample using a Gouy balance or use a torsion balance to observe the attraction … Continue reading “Measuring paramagnetism”

Paramagnetic soil ponderings and perambulations

Paramagnetism is a reasonably straightforward characteristic of materials – if there are unpaired electrons in the atoms then the element will be paramagnetic and weakly drawn to a magnet. This demo of oxygen being paramagnetic is great – so far so scientific. Compounds can change this – water is diamagnetic although H2O is clearly contains … Continue reading “Paramagnetic soil ponderings and perambulations”