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Browsing by Author "Neson Varghese"

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Burned rice husk: An effective additive for enhancing the electromagnetic properties of MgB2 superconductor

Neson Varghese; Vinod, K; Shipra; Sundaresan, A; Syamaprasad, U (Wiley, 2010)

We investigated the effect of doping of burned rice husk which contains ultrafine SiO2 and highly reactive carbon, on the crystal lattice and superconducting properties of MgB2 superconductor prepared by an in situ powder ...
Co-addition of nano-carbon and nano-silica: An effective method for improving the in-field properties of magnesium diboride superconductor

Syju Thomas; Rahul, S; Devadas, K M; Neson Varghese; Sundaresan, A; Syamaprasad, U (Elsevier, 2014)

MgB2 superconductor sample co-doped with nano-carbon (n-C) and nano-silica (n-SiO2) is prepared and its structural and superconducting properties are compared with pure and n-C and nano SiC (n-SiC) mono-doped samples. ...
Combined addition of nano diamond and nano SiO2, an effective method to improve the in-field critical current density of MgB2 superconductor

Rahul, S; Neson Varghese; Vinod, K; Devadas, K M; Syju Thomas; Anees, P; Chattopadhyay, M K; Roy, S B; Syamaprasad, U (Elsevier, 2011)

MgB2 bulk samples added with nano SiO2 and/or nano diamond were prepared by powder-in-sealed-tube (PIST) method and the effects of addition on structural and superconducting properties were studied. X-ray diffraction (XRD) ...
A Comparative Study on the Effects of n C, n SiC and BRH on the Structural and Superconducting Properties of MgB2 PIT Wires

Rahul, S; Devadas, K M; Syju Thomas; Neson Varghese; Paulose, A P; Manoj Raama Varma; Syamaprasad, U (Elsevier, 2017-10-01)

A comparative study on the structural and superconducting properties of MgB2 Powder-In-Tube (PIT) wires doped with various weight percentage of nano carbon (n C), nano SiC (n SiC) and Burned Rice Husk (BRH) has been ...
Effect of carbon substitution on the superconducting properties of nanocarbon-, nanodiamond- and nano-SiC-doped MgB2

Neson Varghese; Vinod, K; Rahul, S; Anees, P; Devadas, K M; Syju Thomas; Shipra; Sundaresan, A; Roy, S B; Syamaprasad, U (Wiley, 2011)

A comparative study on the effect of doping of nanocarbon (C), nanodiamond, and the well-established nano-SiC in MgB2 is carried out under identical doping levels (C: 2.6 and 5.2 wt%) and processing conditions (800 degrees ...
Effect of Combined Addition of Nano-SiC and Nano-Ho2O3 on the in-Field Critical Current Density of MgB2 Superconductor

Neson Varghese; Vinod, K; Chattopadhyay, M K; Roy, S B; Syamaprasad, U (AIP, 2010-11-24)

MgB2 superconducting samples added with nano-Ho2O3 n-Ho2O3 and/or nano-SiC n-SiC have been prepared by an in situ solid state reaction method to investigate and compare the combined and individual effects of n-SiC ...
An effort toward development of MgB2-based current leads with 2000-A rating

Devadas, K M; Rahul, S; Syju Thomas; Neson Varghese; Pradhan, S; Syamaprasad, U (IEEE, 2014)

In this paper, we report an effort toward the development of general-purpose conduction-cooled current leads based on MgB2, which can carry 2000 A at 25 K. The leads have an overall length of 40 cm and a diameter of 5.8 ...
Enhanced Superconducting Properties of Bulk MgB2 Prepared by In Situ Powder-In-Sealed-Tube Method

Neson Varghese; Vinod, K; Ashok Rao; Kuo, Y K; Syamaprasad, U (Elsevier, 2009-02-20)

A systematic study on the superconducting properties of poly crystalline MgB2 synthesized by in situ Powder-In-Sealed-Tube technique is carried out at different temperatures (750–900 ◦C). Both XRD and SEM results show ...
Enhancement of bending strain tolerance and current carrying property of MgB2 based multifilamentary wires

Syju Thomas; Neson Varghese; Rahul, S; Devadas, K M; Vinod, K; Syamaprasad, U (Elsevier, 2012)

The effect of bending strain on current carrying capacity of MgB2 multifilamentary wires was studied with 4, 8 and 16 multifilamentary wires. The critical current density (JC) of straight wires and bent wires with 5, 10, ...
Influence of nano-Cu additive on MgB2 phase formation, processing temperature, and transport properties

Neson Varghese; Vinod, K; Rahul, S; Devadas, K M; Syju Thomas; Pradhan, S; Syamaprasad, U (American Institute of Physics, 2011)

Pure and nano-Cu doped MgB2/Fe superconducting wires were prepared by in situ powder-in-tube method at different temperatures (550-675 degrees C). The phase formation, microstructure, and transport critical current density ...
Microstructural refinement and enhanced transport properties in binary doped NdFeAsO superconductor

Aswathy, P M; Anooja, J B; Neson Varghese; Syamaprasad, U (American Institute of Physics, 2014)

We report the synthesis of Nd1 xCaxFeAsO1 2xF2x superconductors using CaF2 as a binary dopant that provides both holes and electrons by simultaneous substitution of Ca2þ ions and F ions at Nd3þ and O2 sites, respectively. ...
Preparation of in situ MgB2/Fe superconducting tapes with highly densified core by hot pressing of electrically self-heated PIT wires

Vinod, K; Neson Varghese; Rahul, S; Syamaprasad, U (Elsevier, 2009)

Iron-sheathed in situ MgB2 superconducting tapes with high densities were prepared by hot pressing of electrically self-heated powder-in-tube wires. The tapes were characterized for phase purity, density, microstructure ...
The role of Yttrium doping on the structural and superconducting properties of Sm1111 and its comparison with other (RE, Y)1111 (RE La, Ce, and Nd) Iron Oxypnictides

Aswathy, P M; Anooja, J B; Neson Varghese; Syamaprasad, U (Springer/ Plenum Publishers, 2015)

The role of yttrium doping on the structural and superconducting properties of SmFeAsOF (Sm1111) is studied in detail and is compared with other yttrium-doped RE1111 (RE-rare earth) iron oxypnictide superconductors on the ...
SmFeAsO superconductor with preferred crystallographic orientation and enhanced critical current density

Anooja, J B; Aswathy, P M; Neson Varghese; Aloysius, R P; Syamaprasad, U (American Ceramic Society, 2014)

The effect of combined substitution of Sm3+ and O2− with Ca2+ and F−, respectively, on the structural and superconducting properties of SmFeAsO system is investigated. It is observed that the binary doping using CaF2 causes ...
Structural and superconducting properties of bulk MgB2 with added nano Tb4O7

Vinod, K; Neson Varghese; Syamaprasad, U; Shipra; Sundaresan, A (IOP Publishing, 2008)

Bulk MgB2 samples with 0, 1, 5 and 10 wt% of Tb4O7 nanoparticles added were prepared by a powder-in-sealed-tube (PIST) method. X-ray diffraction (XRD) analysis showed small quantities of TbB4, Tb2O3, Mg and MgO as impurities ...
Studies on transport and magnetic properties of nano particle doped MgB2 superconductor for technological applications

Neson Varghese; Syamaprasad, U (Material Science and Technology Division, National Institute For Interdisciplinary Science and Technology (CSIR),Thiruvananthapuram, 2012)
Tackling the Agglomeration of Mg2Si Dopant in MgB2 Superconductor Using Cast Mg-Si Alloy

Rahul, S; Syju Thomas; Devadas, K M; Neson Varghese; Paulose, A P; Manoj Raama Varma; Syamaprasad, U (Elsevier, 2017-09)

The work demonstrates a method to tackle the agglomeration of Mg2Si dopant in chemical doping in MgB2 superconductor to enhance its in-field critical current density. Mg-Si alloy which has uniformly distributed Mg2Si ...
Transport properties of sealed MgB2/Fe/Ni multifilamentary wires heat treated in air

Devadas, K M; Rahul, S; Syju Thomas; Neson Varghese; Vinod, K; Syamaprasad, U; Pradhan, S; Chattopadhyay, M K; Roy, S B (Elsevier, 2011)

Ni sheathed multifilamentary MgB2 wires with Fe barrier and Cu stabilizer were prepared by the in situ Powder-In-Tube (PIT) method. After rolling, the ends of the wires were sealed by a simple capping technique and the ...

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