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S V Subramanyam
Articles written in Bulletin of Materials Science
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Volume 1 Issue 3-4 December 1979 pp 207-212
A brief review of one-dimensional conductors with emphasis on the synthetic criterion, the model systems of radical ion salts, charge transfer complexes, metal chain systems, polymeric conductors and A3B compounds is given.
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Volume 2 Issue 2 May 1980 pp 121-125 Communications
A K Bandyopadhyay B S Sivaram S V Subramanyam
A dual level high pressure cell using Bridgman anvils was constructed to facilitate simultaneous measurement on the samples. The anvils were of 4 mm and 5 mm diameter respectively. The anvils were made from tungsten carbide (3% cobalt binder). Pyrophyllite and steatite were used as the gasket and the pressure transmitting medium. The cell was calibrated against the polymorphic phase transition of bismuth and ytterbium.
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Volume 14 Issue 2 April 1991 pp 93-94 International Conference On Superconductivity—I
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Volume 14 Issue 3 June 1991 pp 531-532 International Conference On Superconductivity—II
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Volume 14 Issue 4 August 1991 pp 889-890 International Conference On Superconductivity—III
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Volume 14 Issue 4 August 1991 pp 891-893 International Conference On Superconductivity—III
Upper critical field of Bi1·5-Pb0·5-Ca2-Sr2-Cu3-O
x superconductorThe high
T c superconductor of nominal composition Bi1·5-Pb0·5-Ca2-Sr2-Cu3-Ox was prepared by solid-state reaction method. The upper critical fieldH c 2 of the material with a zero-resistance transition at 110K was investigated by observing variations in resistance with temperature down to 90 K and with a magnetic field up to7T . The slope ofH c 2 with temperature was about −0·41T/K for zero resistance transition and −6·86T/K for onset of superconductivity.H c 2 values at 0K were estimated to be 31·3T and 563T for zero-resistance transition and onset of superconductivity respectively. -
Volume 14 Issue 5 October 1991 pp 1205-1211
Electrical switching in benzidine-DDQ under pressure
The effect of pressure on non-ohmic conduction and electrical switching in the charge transfer complex benzidine-DDQ has been studied up to a pressure of 7·66 GPa at a temperature of 300K. Pulsed I-V measurements reveal heating contribution to non-ohmicity and switching. At high electric fields (∼ 3 × 103 V/cm), the sample switches from high resistance OFF state of several kiloohms to low resistance ON state of several ohms. Temperature dependence of conductivity of ON state show semiconducting behaviour with very low activation energy.
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Volume 17 Issue 6 November 1994 pp 1091-1094
Thermal expansion of irradiated nylon-6 from 10 K to 340 K
Thermal expansion of irradiated nylon-6 has been studied in the temperature range 10 to 340 K using a three-terminal capacitance bridge technique. Irradiation is carried out using cobalt-60 γ-rays up to 500 Mrad dosage. Radiation enhances chain scission over crosslinking. α increases from 0 to 250 Mrad between 10 to 340 K and not much variation is observed between 250 to 500 Mrad for samples from 10 to 250 K.
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Volume 18 Issue 8 December 1995 pp 1007-1011
Thermal conductivity measurements at low temperatures
P Balaya H S Jayanna Hemant Joshi G Sumana V G Narasimha Murthy V Prasad S V Subramanyam
We describe briefly the experimental facilities developed for the measurement of thermal conductivity of solids in the temperature range 10K–300K. Different techniques have been used for the determination of thermal conductivity, depending on the relaxation time of the system under investigation. Measurements on stainless steel 304, using steady state and non-steady state methods are presented. Values of thermal conductivity obtained by both these methods agree to each other and are consistent with those reported earlier.
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Volume 22 Issue 3 May 1999 pp 139-139
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Bulletin of Materials Science
Volume 46, 2023
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Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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