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Dependence of Hall Coefficient on Temperature

Place of Origin:
Uttarakhand, India
Model Number:
HEX-22
Dependence of Hall Coefficient on Temperature
 
Detailed Description
 


An experiment for measurement Dependence of Hall Coefficient on Temperature.

We offer Dependence of Hall Coefficient on Temperature usefull in physics and material science lab. The Hall voltage for p-carriers has opposite sign from that for n-carriers. Therefore if a semiconductor with p-type doping is gradually heated up, more and more electrons from its valence band will go to conduction band. As a result hall voltage would fall rapidly with temperature and even become zero or change sign. At the point of zero Hall Coefficient, it is possible to determine the ratio of mobilities b=µeh. The Hall coefficient inversion is a characteristic of only p-type semiconductors.

The set-up consists of the following:
 
1. Hall Probe (Ge: p-type), HPP-22
Ge single crystal with four spring type pressure contacts is mounted on a glass-epoxy strip. Leads are provided for connections with the current source and Hall voltage measuring devices.
   
Oven
It is a small oven which could be easily mounted over the crystal or removed if required.

Temperature Sensor

Cromel-Alumel thermocouple with its junction at a distance of 1mm from the crystal.

2. Hall Effect Set-up :DHE-22
The set-up, DHE-22 consists of two sub set-ups, each consisting of further two units.

Measurement of Probe Current & Hall Voltage

This unit consists of digital millivoltmeter and constant current power supply. The Hall voltage and probe current can be read on the same digital panel meter through a selector switch.
   
(a) Digital Millivoltmeter
    Specifications
    Range: 0-200mV (100µV min.)
    Accuracy: ±0.1% of reading ±1 digit
    Impedance: 1MΩ
   
(b) Constant Current Power Supply
     Specifications
     Current: 0-20mA (10µA min)
     Accuracy: ±0.2% of the reading or ±1 digit
     Load regulated: 0.05% for 0 to full load
     Line regulation: 0.05% for 10% variation

Measurement of Thermo emf and Heater current
The unit consists of a digital millivoltmeter and constant current power supply. The thermo emf of thermocouple and heater current can be read on the same DPM through a selector switch.

(a) Digital Millivoltmeter
     Specifications :
     Range: 0-20mV
     Resolution: 10µV equivalent to 0.25°C in terms of thermo emf
    Accuracy: ±0.1% of reading ±1 digit

(b) Constant Current Power Supply
     Specifications
     Current: 0-1A
     Accuracy: ±0.2% of the reading ±1 digit
     Line regulation: 0.1% for 10% variation
     Load regulated: 0.1% for 0 to full load

5. Electromagnet, EMU-50V

6. Constant Current Power Supply, DPS-50

7. Digital Gaussmeter, DGM-202/ DGM-102

The experiment is complete in all respect.


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Company information:
    SES Instruments Pvt. Ltd. established sine 1971 . We is an exporter of India Transformers products.    Our products have been sold well in North America South America Mid East Eastern Asia! Strict quality control is monitored at all stages of the production process and product quality is being upgraded from time to time to meet the market trend!    If you are interested in our products ,for more details, please feel free to contact us.
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Mr. Ravi Prakash
452 Adarsh Nagar
91-1332-272852

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