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Browsing by Author "Manoj Raama Varma"

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Co-existence of magnetocaloric effect and magnetoresistance in Co substituted La0.67Sr0.33MnO3 at room temperature

Reshmi, C P; Savitha Pillai, S; Vasundhara, M; Raji, G R; Suresh, K G; Manoj Raama Varma (American Institute of Physics, 2013)

Magnetization (M), Magnetocaloric effect (MCE), and Magnetoresistance (MR) in Co substituted La0.67Sr0.33Mn1-xCoxO3 (x = 0.03, 0.05, and 0.1) samples have been investigated. All the studied samples were crystallized into ...
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 ...
Competing Magnetic and Spin-Gapless Semiconducting Behavior in Fully Compensated Ferrimagnetic CrVTiAl: Theory and Experiment

Venkateswara, Y; Gupta, S; Samatham, S S; Manoj Raama Varma; Enamullah; Suresh, K G; Alam, A (American Physical Society, 2018-02-06)

We report the structural, magnetic and transport properties of polycrystalline CrVTiAl alloy along with rst principles calculations. It crystallizes in the LiMgPdSn type structure with lattice parameter 6.14 A at room ...
Critical behavior and magnetocaloric effect in La0.67Ca0.33Mn1 xCrxO3 (x ¼ 0.1, 0.25)

Nisha, P; Savitha Pillai, S; Manoj Raama Varma; Suresh, K G (Elsevier, 2012-01)

Universal behavior of the magnetocaloric effect along with structural and critical exponent analysis in mixed manganite La0.67Ca0.33Mn1 xCrxO3 (x ¼ 0.1, 0.25), [LCMCr0.1 and LCMCr0.25] exhibiting second order phase transition ...
Critical behaviour and magnetocaloric effect of nano crystalline La0.67Ca0.33Mn1 xFexO3 (x ¼ 0.05, 0.2) synthesized by nebulized spray pyrolysis

Nisha, P; Savitha Pillai, S; Darbandi, A; Manoj Raama Varma; Suresh, K G; Hahn, H (Elsevier, 2012-09-14)

The structure, critical exponents and magnetocaloric effect (MCE) of Nebulized Spray Pyrolysis (NSP)synthesized nano crystalline La0.67Ca0.33Mn1 xFexO3 (x ¼ 0.05, 0.2) were investigated. The Reitveld refinement of XRD ...
Effect of dopants on microwave dielectric properties of Ba(Zn1/3Nb2/3)O-3 ceramics

Manoj Raama Varma; Sebastian, M T (Elsevier, 2007)

Ba(Zn1/3Nb2/3)O-3 (BZN) has been prepared with various amounts of different dopants such as oxides of monovalent, divalent, trivalent, tetravalent, pentavalent and hexavalent elements. Effect of these dopants on microwave ...
Effect of Dopants on the Low Temperature Microwave Dielectric Properties of Ba(Zn1/3Ta2/3)O3 Ceramics

Manoj Raama Varma; Kataria, N D (spinger, 2007-04)

Ba(Zn1/3Ta2/3)O3 has been prepared with different dopants that gave best microwave dielectric properties at room temperature. Effects of different dopants on the low temperature microwave dielectric properties of BZT ...
Effect of Nb2O5 Substitution on the dielectric characteristics of DyTiTaO6 microwave ceramics

Joseph, J T; Kumar, H P; Manoj Raama Varma; Thomas, J K; Sam Solomon (Elsevier, 2008)

Ceramic materials of the type DyTiNbxTa1-xO6 Were prepared by conventional solid-state route for different values of x. The materials were characterized by X-ray diffraction and Scanning Electron Microscopy. Dysprosium ...
Facile bioanchoring strategy for the preparation of hierarchical multiple structured ZnO crystals and its application as a photoanode in dye sensitized solar cells

Ramakrishnan, R; Aravind, A; Sudha, J D; Manoj Raama Varma; Kiran Mohan (American Chemical Society, 2014)

This paper demonstrates a facile bioanchoring strategy for controlling the crystal growth process of ZnO crystals during calcination to form hierarchical multiple structures. Crystalline phase and morphology of ZnO was ...
Facile strategy for the fabrication of efficient nonvolatile bistable memory devices based on polyvinylcarbazole– zinc oxide

Rajaraman, Ramakrishnan; Jinesh, K B; Sudha, J Devaki; Manoj Raama Varma (wiley, 2016-04-19)

This paper describes the development of polyvinylcarbazole– ZnO hybrid nanocomposites (PVZ) comprising electron donor carbazole moiety (p-type) and electron acceptor zinc oxide (ntype) by a facile strategy and demonstrated ...
Finite size effect on the sinterability and dielectric properties of ZnNb2O6-ZBS glass composites

Sanoj, M A; Reshmi, C P; Manoj Raama Varma (Wiley, 2009)

ZnNb2O6 (ZN) is a columbite-structured niobate compound showing excellent dielectric properties and comparatively low sintering temperatures (similar to 1200 degrees C). Hence it is a good candidate for possible low-temperature ...
Influence of cobalt on the structural, magnetic and magnetocaloric properties of La0.67Ca0.33MnO3

Nisha, P; Savitha Pillai, S; Manoj Raama Varma; Suresh, K G (Elsevier, 2013)

The critical properties and magnetocaloric effect of perovskite manganite La0.67Ca0.33Mn1-xCoxO3 (x=0.03, 0.1 and 0.15) are investigated. Structural study using Reitveld refinement of X-ray diffraction pattern indicates ...
Influence of dy addition on the magnetocaloric effect of La0.67Ca0.33Mn0.9V0.1O3 ceramics

Nisha, P; Savitha Pillai, S; Suresh, K G; Manoj Raama Varma (Elsevier, 2012-01)

The influence of partial substitution of Laby Dy on the magnetocaloric response of(La1 xDyx)0.67-Ca0.33Mn0.9V0.1O3, where x¼0.03, 0.15and0.25 is studied.Rietveld refinement ofX-ray diffraction pattern using GSAS method ...
Influence of zinc oxide addition on LnTiTaO6 (Ln = Pr, Sm and Dy) materials for dielectric resonators

Padma Kumar, H; Joseph, J T; Thomas, J K; Manoj Raama Varma; Annamma, J; Sam Solomon (Elsevier, 2007)

LnTiTaO6 ceramics, doped with ZnO, were prepared in the solid-state ceramic route. The cylindrical samples were sintered at temperatures between 1360 and 1575 ◦C. The densities were measured using Archimedes method. Samples ...
Magnetic and magnetocaloric properties of Gd3 xTbxGa5O12 (x¼0, 1,2,3) garnets

Reshmi, C P; Savitha Pillai, S; Suresh, K G; Manoj Raama Varma (Elsevier, 2012-06)

The structure and magnetocaloric properties of Tb substituted Gd3Ga5O12 garnets have been investigated.The structural refinement to X-ray diffraction patterns show that Gd3 xTbxGa5O12 (x¼0, 1,2,3)are isostructural,with the ...
Magnetic dye-adsorbent catalyst::Processing, characterization, and application

Lajina, T; Anas, S; Shukla, S; Reshmi, C P; Manoj Raama Varma; Suresh, K G; Patil, K; Warrier, K G K (Wiley, 2010)

A magnetic dye-adsorbent catalyst has been processed by subjecting the conventional magnetic photocatalyst to a hydrothermal process followed by typical washing and thermal treatments. It has been characterized using the ...
Magnetocaloric properties, exchange bias, and critical behavior of Ge substituted Ni50Mn36Sn14 Heusler alloys

Raji, G R; Bhagya Uthaman; Senoy Thomas; Suresh, K G; Manoj Raama Varma (American Institute of Physics, 2015)

The effect of Ge substitution on the magnetic, magnetocaloric, and exchange bias properties of Heusler alloy system Ni50Mn36Sn14-xGex (x = 1, 2) has been investigated. With the increase of Ge content, the cell volume ...
Magnetocaloric Properties, Exchange Bias, and Critical Behavior of Ge Substituted Ni50Mn36Sn14 Heusler Alloys

Raji, G R; Bhagya Uthaman; Thomas Senoy; Suresh, K G; Manoj Raama Varma (AIP, 2015-03-14)

The effect of Ge substitution on the magnetic, magnetocaloric, and exchange bias properties of Heusler alloy system Ni50Mn36Sn14-xGex (x ¼ 1, 2) has been investigated. With the increase of Ge content, the cell volume ...
Multiple Magnetic Transitions, Griffiths-Like Phase, and Magnetoresistance in La2CrMnO6

Jasnamol, P P; Sankar, C R; Manoj Raama Varma (AIP Publishing, 2017-08)

DC and AC magnetic measurements indicate the presence of multiple magnetic transitions arising from the competing magnetic interaction between Cr and Mn in the perovskite La2CrMnO6. Ferromagnetic and spin glass transitions ...
Nanostructured Semiconducting PEDOT−TiO2/ZnO Hybrid Composites for Nanodevice Applications

Rajaraman, Ramakrishnan; Sudha, J D; Aashish, A; Senoy Thomas; Manoj Raama Varma; Najiya, K P P (ACS publication, 2016-01-29)

In this paper, we have developed a simple strategy for the preparation of hybrid nanocomposites of poly(3,4-ethylenedioxythiophene)− TiO2/ZnO (PZT) and demonstrated its application in a thermoelectric device. Hierarchical ...

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