Pressure calibration in solid media high pressure apparatus in the range 0-10 GPa.

Divakar, C and Mohan, Murali and Jaman, PM and Singh, AK (1987) Pressure calibration in solid media high pressure apparatus in the range 0-10 GPa. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

The pressure dependence of the resistance of tin, lead and13; manganin samples, at 300K has been investigated with a view13; to assessing their suitability as pressure gauges, for the13; continuous determination of sample pressure in apparatus13; using solid pressure transmitter. The opposed anvil apparatus (0-10 GPa) and the cubic anvil apparatus (0-5 GPa) with talc as pressure transmitting medium have been used to pressurize samples. The resistance-pressure data for the tin, lead and manganin samples obtained in the present work have been compared with those in hydrostatic medium.13; It has been observed that the sample pressures can be determined to an uncertainty of + 0.05 GPa at 2.5 GPa and + 0.25 GPa at 8 GPa, using tin as a pressure gauge in the opposed anvil apparatus and + 0.05 GPa up to 5 GPa in the cubic anvil apparatus. Using lead as a pressure sensor, the uncertainty in the determination of sample pressure is + 0.05 GPa up to 5 GPa in the cubic anvil apparatus. The large dimensional changes occurring in lead samples during pressurization in the opposed anvil apparatus makes lead unsuitable as a pressure sensor.A value 0.037:!:O.OOl/GPa for the pressure co-efficient of resistance of manganin wire sample has been obtained and is higher than. 023/GPa, the hydrostatic value.The reasons leading to this increase have been discussed.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Pressure calibration;Solid media apparatus;Resistance gauge
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Users 60 not found.
Date Deposited: 04 Aug 2006
Last Modified: 24 May 2010 04:16
URI: http://nal-ir.nal.res.in/id/eprint/2243

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