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Browsing by Author "Vinod, K"

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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 ...
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) ...
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 ...
Effect of Site Selective Doping of Sm on the Superconducting and Flux Pinning Properties of (Bi, Pb)-2212

Biju, A; Vinod, K; Syamaprasad, U (IOP Publishing, 2006-10)

The effect of site selective doping of Sm on the superconducting and flux pinning properties of (Bi, Pb)-2212 superconductor has been investigated. Pure, Sm substituted at different cationic sites such as Bi, Sr and Ca, ...
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, ...
Flux Pinning Properties of Magnesium Diboride Added (Bi,Pb)-2212 Superconductors

Vinod, K; Abhilash Kumar, R G; Biju, A; Sarun, P M; Syamaprasad, U (Elsevier, 2007-07-31)

Microstructure and flux pinning properties of polycrystalline (Bi,Pb)-2212 system with varying levels (0–0.2 wt.%) of MgB2 was studied. Phase analysis, microstructural investigation and superconducting characterization ...
Highly enhanced flux pinning in Pb and rare earth codoped Bi-2212

Biju, A; Vinod, K; Sarun, P M; Syamaprasad, U (AIP, 2007-01-17)

The effect of codoping of Pb and rare earths rare earths REs =La, Gd, and Yb in Bi-2212 superconductor on structural, transport, and flux pinning properties was investigated in comparison with solo doping of REs. While ...
Improved Superconducting Properties by La Addition in (Bi,Pb)-2212 Bulk Superconductor

Biju, A; Vinod, K; Aloysius, R P; Syamaprasad, U (Elsevier, 2007-04-04)

The effects of La addition on the structural and superconducting properties of (Bi,Pb)-2212 bulk superconductor prepared by solid state synthesis in the polycrystalline form were studied. The La content of the samples was ...
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 ...
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 ...
Significant Enhancement of the In-field Critical Current Density of the MgB2 Superconductor through Codoping of Nano-TiC with Nano-SiC

Vinod, K; Varghese, N; Roy, S B; Syamaprasad, U (IOP Publishing, 2009-05)

Nanoparticles of two carbides, SiC and TiC, having different reactivities with the Mg/B are doped into the MgB2 system. These carbides are added in mono-and codoping conditions through the in situ solid state reaction, and ...
A simple and inexpensive method for rapid synthesis of MgB2 superconductor

Abhilash Kumar, R G; Vinod, K; Aloysius, R P; Syamaprasad, U (Elsevier, 2006)

MgB2 samples were prepared by a sealed tube method and a systematic study on phase formation at different reaction temperatures was conducted. Phase analysis and structural studies were carried out using XRD and SEM together ...
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 development of MgB2 superconductor with improved in-field critical current density

Vinod, K (National Institute for Interdisciplinary Science and Technology(CSIR), Thiruvananthapuram., 2010-01)
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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