INFRASTRUCTURE

Faculty in-charge : Dr. Anuradha M. Ashok

The sample holder uses a unique balance contact mechanism, permitting measurement of high reproducibility. V-I plot measurement can be made to judge if the lead is in intimate contact with a set sample. The system automatically examines whether the contact of the probes with a sample ohmic or not, and finds and uses the best value of electric current to determine the resistivity of the sample without influence of heat transfer.Measurement is controlled by a computer, permitting automatic measurement with each temperature difference at a specified temperature and elimination of dark electromotive force.

Measurement technique Seebeck Coefficient : Static DC method

Electric Resistance : Four- Probe method

Seebeck Measurement System

Simultaneous Seebeck coefficient and electrical conductivity measurement System

Sample size : 2 to 4 mm square or diameter ~ 5 to 22 mm long

Measurement : It can measure a wide range of samples including semiconductors, oxides and metals

Temperature range : 50 deg C to 1000 deg C.

Simultaneous Thermal Analysis generally refers to the simultaneous application of Thermogravimetry (TGA) and Differential Scanning Calorimetry (DSC) to one and the same sample in a single instrument. The advantages of the instrument are: The test conditions are perfectly identical for the TGA and DSC signals (same atmosphere, gas flow rate, vapor pressure on the sample, heating rate, thermal contact to the sample crucible and sensor, radiation effect, etc.).

Simultaneous Thermal analyzer

Instrument : STA449 F3 Jupiter from Netzsch, Germany

Sample quantity : 5 mg

Atmosphere : Nitrogen, Air, Argon

Heat ramp : 20 K/min

Temperature : Upto 773 K (Aluminium crucible), 1473 K (Alumina crucible)

TGA : mass changes, temperature stability, oxidation/reduction behavior, decomposition, corrosion studies, compositional analysis and thermokinetics.

DSC : melting/crystallization behavior, solid-solid transitions, polymorphism, degree of crystallinity, glass transitions, cross-linking reactions, oxidative stability, purity determination, specific heat and thermokinetics.

Hall Effect Measurement Systems plot concentration versus temperature, mobility versus temperature, resistivity versus temperature, conductivity versus temperature, and Hall coefficient versus temperature. The HMS3000 & temperature controller HT55T5 includes software with I-V curve capability for checking the ohmic integrity of the user made sample contacts. The systems ramp to each user defined temperature, stabilize, makes the measurement and then plots the various temperature dependent material electrical properties.

TEMPERATURE Dependent Hall measurement

Instrument: HMS 3000/HT55T5 from Ecopia Corp, South Korea

Sample requirement: Thin film or bulk materials

Maximum thickness : 2 mm

Maximum Size : 1 x 1 cm

Conditions : I-V chactercteristics, uniformity of sample and peeloff test are mandatory

Features

· Low and high resistivity measurement capability, bulk and sheet carrier concentration and mobility, Hall coefficient in semiconductors

· DC measurement modes

· van der Pauw and Hall measurements

· Board system (room temperature to 673K)

Selenization/sulfurization is a process whereby a surface of a material is exposed to a selenium or sulphur containing atmosphere at high temperature. The surface reacts and forms a new compound incorporating either selenium or sulfur or a combination of the two. When Se is supplied in the gas phase (for example as H2Se or elemental Se) at high temperatures, the Se becomes incorporated into the film by absorption and subsequent diffusion.

SelenizATion Chamber

Furnace structure-Specifications

Compact 4inch RTP tube furnace

Heating Zone

12inch length with 4inch constant temperature zone: within +/-1°C uniformity.

Working Temperature

Max: 1000°C; Heating rate: 1000°C at 50°C/Sec and fast cooling

Heating elements

IR Heating Lamp; PID automatic controller for precise control of heating rate, cooling rate and dwell time

Quartz tube & sample holder

Quartz tube size -4.33inch Q.D*4.05inch 1.D*16.2inch length

Flowmeter

Gas flow adjust from 0-160ml/min

Gas Mixer

Four stainless steel valves are installed in side panels three gas flow meter to monitor the flow rate of each gas, 10-100ml/min, 16-160ml/min, 25-250ml/min

HIGH TEmperature Tubular furnace

Instrument: High Temperature Tubular Furnace, Ants Ceramics Pvt. Ltd.

Temperature: 13000C

Operating Temperature: Up to 12000C.

Sample Type: Powder (5 g), Pellet, Thin Film.

Atmospheric condition: Air, Nitrogen, Argon.

Features:

· operated by automatic temperature controller.

· samples can be heated with different atmospheric conditions such as Air, Nitrogen, Argon.

Muffle Furnace is box type heat treatment equipment used to change physical properties of samples at very high temperature. All materials (Nano to Bulk) can be prepared by the air atmosphere.

MUFFLE furnace

Instrument:Muffle Furnace,SwamEquip, Chennai.

Atmosphere: Air

Temperature: 13500 C

Operating Temperature: Up to 9000C.

Sample Type: Powder (10 g), Pellet, Thin Film

Atmospheric condition: Air

Manual hydraulic press producing a force about 15 tones uses to make high quality 13 mm Pallet used for IR/FTIR/XRF Solid Sampling.

hydraulic press

Pelletising the powders

Maximum pressure : 10 tones

Functional Material Laboratory services can be availed on charge basis.

Terms and Conditions

  • Prior registration with advance payment is essential to avail any of these facilities.

  • Appointment will be given as per queue and the allotted time for the slot will be informed through E-mail.

  • For a better analysis basic details about the sample should be given.

  • Before giving the sample for Hall measurement and Seebeck measurement analysis, it is suggested that the sample is characterized by other techniques such as XRD, SEM, AFM, TG etc.

  • No refund of the payment made in any case.