Bismuth Magnetic Susceptibility Kit

Bismuth Magnetic Susceptibility Kit

260.00

 

TEL-K20B

When a substance becomes superconducting there is an abrupt change in the magnetic susceptibility. Two kits have been developed to demonstrate this phenomena. One kit is bismuth based (BSCCO), the other kit is based on Yttrium (YBCO). The BSCCO material has 2 separate crystalline superconducting phases. The 2212 phase (Bi2Sr2CaCu2O9) has a critical temperature of around 85K°. The 2223 phase (Bi2Sr2Ca2Cu3O11) has a critical temperature of approximately 110K°. The yttrium based material has only 1 phase and the critical temperature is around 88K°.

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TEL-K20

When a substance becomes superconducting there is an abrupt change in the magnetic susceptibility. Two kits have been developed to demonstrate this phenomena. One kit is bismuth based (BSCCO), the other kit is based on Yttrium (YBCO). The BSCCO material has 2 separate crystalline superconducting phases. The 2212 phase (Bi2Sr2CaCu2O9) has a critical temperature of around 85K°. The 2223 phase (Bi2Sr2Ca2Cu3O11) has a critical temperature of approximately 110K°. The yttrium based material has only 1 phase and the critical temperature is around 88K°.

As a material enters a superconducting state it becomes purely diamagnetic. As the diamagnetation increases, the inductance of the material becomes lower.

Figure 1 shows a plot of Inductance v/s Temperature for the Bismuth based material. As the temperature decreases, a sudden change in induction occurs at around 110K°. At this point the bulk of the material comprised of the 2223 crystalline phase becomes superconducting. From 105K° to 90K° there is a leveling off as the remaining material in the 2223 crystalline become superconducting. From 90K° to 85K° there is another sudden decrease in the inductance as the parts of the material that are composed of the 2212 crystalline phase become superconducting. The graph of the yttrium based probe is similar except there is only one phase around 88K°.

Each kit contains either a 1" diameter bismuth or yttrium pellet, 100 W resistor, a YBCO or BSCCO susceptibility probe, small square magnet, tweezers and an experiment guide.

Accessories required: (not included)

  • 1000-2000 Hz function generator to produce a sine wave signal
  • Sand Cryostat TEL-CRYO
  • AC mA meter with 0.01 mA resolution to measure coil resistance
  • AC Voltmeter with 1 mA resolution
  • DC Voltmeter with 0.001 mA resolution for Type T thermocouple