Research Papers (Prof. C.N.R. Rao): Recent submissions

Now showing items 141-160 of 877

Composition dependence of giant magnetoresistance in La1-xCaxMnO3 (0.1 ≤ x ≤ 0.9)

Mahendiran, R; Mahesh, R; Raychaudhuri, A K; Rao, C N R (Elsevier Science, 1995-05)

We have studied the resistivity (ρ) and the magnetoresistance (MR) in sintered samples of La1−xCaxMnO3 for 0.1≤x≤0.9 in the temperature range 4.2K≤T≤400K in magnetic fields H≤6T. We have observed giant negative magnetoresistance ...
Dynamics of charge transfer in the excited amine complexes of the fullerenes C60 and C70.: A picosecond laser flash photolysis study

Palit, D K; Ghosh, H N; Pal, H; Sapre, A V; Mittal, J P; Seshadri, Ram; Rao, C N R (Elsevier Science BV, 1992-10-02)

In benzene solution, C60 and C70 interact weakly in the ground state with amines having favourable oxidation potentials. Picosecond time-resolved absorption measurements show that on photoexcitation, the weak complexes ...
Scanning tunneling microscopy and spectroscopy of C70 thin films

Aiyer, Hemanthkumar N; Govindaraj, A; Rao, C N R (Indian Academy Of Sciences, 1994-11)

Scanning tunneling microscopy of C-70 films deposited on HOPG and gold substrates has been carried but to investigate the 2D packing, defects and disorder. Besides providing direct evidence for orientational disorder, high ...
An investigation of transition metal clusters deposited on graphite and metal oxide substrates by a combined use of XPS, UPS and Auger spectroscopy

Vijayakrishnan, V; Rao, C N R (Elsevier Science BV, 1991-09)

Cu and Ni clusters deposited on graphite and metal oxide (TiO2, Al2O3) supports have been investigated by X-ray and UV photoelectron spectroscopy as well as Auger electron spectroscopy. The 2p core-level binding energy of ...
Tunneling studies on single crystals of superconducting Bi2Ca1−xYxSr2Cu2O8+δ

Srikanth, H; Raychaudhuri, A K; Rao, C R Venkateswara; Ramasamy, P; Aiyer, Hemantkumar N; Rao, C N R (Elsevier Science BV, 1992-10-01)

Tunneling studies have been carried out on single crystals of Bi2Ca1−xSrxCu2O8+δ over a wide range of compositions wherein the hole concentration varies by a factor of 2.5. The 2Δ value varies between 25 meV and 75 meV ...
Interaction of CO with Cu/ZnO catalyst surfaces prepared in situ in the electron spectrometer: evidence for CO, and related species relevant to methanol synthesis

Harikumar, K R; Rao, C N R (Elsevier Science BV, 1998-02)

Interaction of CO with the Cu/ZnO catalyst surfaces prepared in situ in the sample preparation chamber of the electron spectrometer has been investigated by X-ray photoelectron spectroscopy. The catalyst surfaces contained ...
Letter to the Editor - Effect of Substitution of Cr31 in Place of Mn31 in Rare-Earth Manganates on the Magnetism and Magnetoresistance: Role of Superexchange Interaction and Lattice Distortion in LnMn(1-x)Cr(x)O(3)1

Gundakaram, R; Arulraj, Anthony; Vanitha, P V; Rao, C N R; Gayathri, N; Raychaudhuri, A K; Cheetham, A K (Academic Press Inc, 1996-12)

Magnetic and electrical properties of oxides of the formulaLnMn1−xCrxO3(Ln= rare earth) have been investigated to understand the importance of the Mn3+–O–Cr3+superexchange interactions, in contrast to theLn1−xAxMnO3(A= ...
Carbon nanotubes by the metallocene route

Sen, Rahul; Govindaraj, A; Rao, C N R (Elsevier Science BV, 1997-03-21)

Pyrolysis of metallocenes such as ferrocene, cobaltocene and nickelocene, is shown to yield carbon nanotubes and metal-filled onion-like structures, Pyrolysis of benzene in the presence of a metallocene gives high yields ...
Macroporous silver monoliths using a simple surfactant

Khan, Farid; Eswaramoorthy, M; Rao, C N R (Elsevier Science BV, 2007-01)

An elegant method to synthesize porous silver monoliths using a simple surfactant cum reductant, Triton X-114, as the sacrificial template is described. The gel forming property of the surfactant with silver nitrate is ...
Metal chalcogenide–organic nanostructured composites from self-assembled organic amine templates

Neeraj; Rao, C N R (Royal Society Chemistry, 1998-02)

Hexagonal and lamellar nanostructured organic-metal chalcogenide composites have been prepared by the reaction of metal salt aliphatic-amine nanostructured adducts with Na2S or Na2Se solution; nanostructured composites of ...
Layered cobalt phosphates by the amine phosphate route

Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (Academic Press Inc, 2000-11-15)

Two layered cobalt phosphates, I, [NH3CH2CH(OH) CH2NH3][Co2(PO4)2], and II, [NH3CH2CH(OH)CH2NH3] [Co2(HPO4)3], have been hydrothermally synthesized employing the reaction of 1,3-diammonium-2-hydroxy propane with CoII ions. ...
Large Aligned-Nanotube Bundles From Ferrocene Pyrolysis

Rao, C N R; Sen, Rahul; Satishkumar, B C; Govindaraj, A (Royal Society Chemistry, 1998-08-07)

Aligned-nanotube bundles have been obtained in copious quantities by the pyrolysis of ferrocene or ferrocene-acetylene mixtures.
Oxyanion derivatives of cuprate superconductors : Superconducting thallium cuprate oxysulfate, Tl0.5Pb0.5Sr4Cu2(SO4)Oy

Ayyappan, S; Manivannan, V; Subbanna, G N; Rao, C N R (Pergamon-Elsevier Science Ltd, 1993-08)

A superconducting thallium cuprate oxysulfate of the compositlon Tl0.5Pb0.5Sr4Cu2(SO4)O(y), (P4/mmm, a = 3.85Å, c = 16.6Å) related to the 1293 type cuprate family has been characterized. Infrared spectra show that the ...
A Study Of Superionic CsHSO4 And Cs1-x Lix HSO4 By Vibrational Spectroscopy And X-Ray-Diffraction

Varma, Vijay; Rangavittal, N; Rao, C N R (Academic Press Inc, 1993-09)

Infrared and Raman spectroscopic studies of CsHSO4 suggest the occurrence of the following phase transitions:IV⇆340K III⇆380 K II⇆417K I. While the ordered phase, IV, has a monoclinic structure, the high-temperature ...
Fascinating chemistry of metal clusters and carbon clusters (fullerenes)

Rao, C N R (Elsevier Science BV, 1993-08)

Investigations of a variety of transition metal clusters by means of high-energy spectroscopies including BIS show the occurrence of a metal-insulator transition with decrease in the cluster size. The chemical reactivity ...
Ferromagnetism as a universal feature of inorganic nanoparticles

Sundaresan, A; Rao, C N R (Elsevier Science Ltd, 2009-02)

Room-temperature ferromagnetism is exhibited by nanoparticles of a variety of inorganic materials although they are intrinsically non-magnetic. Typical of such nanomaterials are the oxides, CeO2, TiO2, Al2O3, and MgO. ...
Structure and properties of oxyanion derivatives of 123 cuprate superconductors: Effect of substitution of carbonate and nitrate ions in the Cu(1) position of YBaSrCu3O7−δ

Rao, C N R; Nagarajan, R; Mahesh, R; Kulkarni, G U; Ayyappan, S; Subbanna, G N (Pergamon-Elsevier Science Ltd, 1993-12)

When the Cu(1) site in orthorhombic YBaSrCu3O7−δ (Tc = 80 K), is partly substituted by the carbonate ion (upto 50%), the crystal structure becomes tetragonal and the electron diffraction pattern shows evidence for 2a × 2c ...
Synthesis of Pb-Based Cuprate Superconductors by the Sol-Gel Method

Mahesh, R; Nagarajan, R; Rao, C N R (Academic Press Inc, 1992-01)

The sol-gel method provides a convenient means for preparing lead cuprates of the types Pb2Sr2−yBayLn1−xCaxCu3O8 (2213 type) with Ln=Y or rare earth and Pb1−zCuzSr2−yBayY1−xCaxCu2O7(1212 type). Superconducting compositions ...
Absence of ferromagnetism in electron-doped rare-earth manganates, Ln(1-x)A(x)MnO(3) (x > 0.5)

Vanitha, P V; Sarathy, K Vijaya; Cheetham, A K; Rao, C N R (Pergamon-Elsevier Science Ltd, 2000)

In order to explore whether the ferromagnetic metallic state ever occurs in the electron-doped rare-earth manganates, a comparative study of the effects of magnetic fields and of cation substitution in the Mn-site were ...
A simple method to prepare ZnO and Al(OH)(3) nanorods by the reaction of the metals with liquid water

Panchakarla, L S; Shah, M A; Govindaraj, A; Rao, C N R (Academic Press Inc Elsevier Science, 2007-11)

Reaction of liquid water with Zn and Al powders and foils have been investigated in the 25–75 °C range. The reaction of Zn metal powder with water in this temperature range yields ZnO nanorods. The diameter of the nanorods ...

Now showing items 141-160 of 877

Search DSpace

Advanced Search

Browse

All of DSpace
This Collection
- By Issue Date
- Authors
- Titles
- Subjects

Recently added

Research Papers (Prof. C.N.R. Rao): Recent submissions

Search DSpace

Browse

All of DSpace

This Collection

My Account