Certainly! Here are the materials typically used for making thermocouples of different types:

1. Type J Thermocouple:

   • Positive Leg: Iron (Fe)
   • Negative Leg: Constantan (Copper-Nickel alloy)

2. Type K Thermocouple:

   • Positive Leg: Nickel-Chromium (Ni-Cr)
   • Negative Leg: Nickel-Aluminum (Ni-Al)

3. Type T Thermocouple:

   • Positive Leg: Copper (Cu)
   • Negative Leg: Constantan (Copper-Nickel alloy)

4. Type E Thermocouple:

   • Positive Leg: Nickel-Chromium (Ni-Cr)
   • Negative Leg: Constantan (Copper-Nickel alloy)

Each type of thermocouple utilizes different combinations of materials to produce a voltage output proportional to the temperature difference between the measuring junction and the reference junction. These materials are chosen based on their thermal and electrical properties, as well as their suitability for the desired temperature range and application conditions.