Thermistor Problem: Finding Material and Equation

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To determine the appropriate material for a thermistor, the equation ΔR=kΔT is essential, where ΔR represents change in resistance, k is the temperature coefficient of resistivity, and ΔT is the change in temperature. Accurate measurements of resistance at known temperatures are necessary, using methods like Ohm's law to obtain voltage and current readings. The non-linear characteristics of thermistors must be considered, especially for applications like self-heating regulation or temperature sensing. The value of k can be derived from the slope of the resistance versus temperature curve plotted from the collected data. Understanding these principles will aid in selecting the right thermistor material and optimizing its performance.
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Ok so I am trying to figure out what type of material a thermistor should be, and am using the equation ΔR=kΔT (R being the resistivity, k being the temperature coefficient of resistivity, with which I want to find and match it up with a material, and T being the temperature). I have the change in temperature and the resistivity is initially at zero, but I don't have either the final resistivity or k. Can anyone give me some guidance? Thanks!
 
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Thermistors are often non-linear. Some are designed as self heating regulation devices, others as temperature sensors. You need to measure the characteristics of your device and identify thermal conductivity regarding self heating.
Start here; http://en.wikipedia.org/wiki/Thermistor
 
Is this a school experiment? It sounds like one I supervised a few years ago.

If so, you need to measure the resistance at several temperatures (known temperatures - ice water, boiling water, etc) using Ohm's law with measured voltages and currents. Then plot your results.

k is the slope of the curve.
 

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