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Now showing items 2201-2220 of 2767

A study of micropores in single-walled carbon nanotubes by the adsorption of gases and vapors

Eswaramoorthy, M; Sen, Rahul; Rao, C N R (Elsevier Science BV, 1999-05-01)

Adsorption of N-2, benzene and methanol have been studied on as-prepared single-walled carbon nanotubes (SWNT) as well as SWNTs treated with HCl and HNO3. These nanotubes are good microporous materials with total surface ...
Boron-carbon nanotubes from the pyrolysis of C2H2-B2H6 mixtures

Satishkumar, B C; Govindaraj, A; Harikumar, K R; Zhang, Jin Ping; Cheetham, A K; Rao, C N R (Elsevier Science BV, 1999-02-05)

Boron-doped carbon nanotubes have been prepared by the pyrolysis of acetylene-diborane mixtures in a stream of helium and hydrogen. The nanotubes so obtained have compositions around C35B. The presence of boron favours ...
Bundles of aligned carbon nanotubes obtained by the pyrolysis of ferrocene-hydrocarbon mixtures: role of the metal nanoparticles produced in situ

Satishkumar, B C; Govindaraj, A; Rao, C N R (Elsevier Science BV, 1999-07-02)

Aligned nanotube bundles have been produced by the pyrolysis of ferrocene along with methane, acetylene or butane. Ferrocene-acetylene mixtures are found to be ideal for the production of compact aligned nanotube bundles. ...
Pressure Behaviour of SingleWall Carbon Nanotube Bundles and Fullerenes: A Raman Study

Sood, A K; Teresdesai, Pallavi V; Muthu, D V S; Sen, Rahul; Govindaraj, A; Rao, C N R (WILEY-VCH Verlag GmbH, 1999-09)

We shall discuss our recent high pressure Raman studies on single wall carbon nanotube (SWNT) bundles and compare them with pressure-induced amorphous and polymeric phases of crystalline C-60 and C-70 Our high pressure ...
Unusual dual role of the organic amine in an open-framework structure

Vaidhyanathan, R; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 1999-11)

The hydrothermal synthesis and single crystal structure determination of a new open-framework zinc phosphate, [NH3(CH2)(3)NH3](2)[NH3(CH2)(3)NH2](2)[Zn-12(OH2)(2)(PO4)(10)]. H2O, is reported. Crystal data: monoclinic, space ...
Electric-field-induced melting of the randomly pinned charge-ordered states of rare-earth manganates and associated effects

Rao, C N R; Raju, A R; Ponnambalam, V; Parashar, Sachin; Kumar, N (American Physical Society, 2000-01-01)

Films of charge-ordered Nd0.5Ca0.5MnO3, Gd0.5Ca0.5MnO3, Y0.5Ca0.5MnO3, and Nd0.5Sr0.5MnO3 show insulator-metal transitions on the passage of small electrical currents. That such an electric-field-induced transition occurs ...
Collapse of the charge ordering gap of Nd0.5Sr0.5MnO3 in an applied magnetic field

Biswas, Amlan; Arulraj, Anthony; Raychaudhuri, A K; Rao, C N R (IOP Publishing Ltd, 2000-02-14)

We report results of tunneling studies on the charge ordering compound Nd0.5Sr0.5MnO3 in a magnetic field up to 6 T and for temperature down to 25 K. We show that a gap (2 Delta(CO) approximate to 0.5 eV opens up in the ...
Charge, Spin, and Orbital Ordering in the Perovskite Manganates, Ln1-xAxMnO3 (Ln = Rare Earth, A =Ca or Sr)

Rao, C N R (American Chemical Society, 2000-05-29)

Charge ordering occurs in some mixed-valent transition metal oxides. The perovskite manganates of the formula Ln(1-x)A(x)MnO(3) (Ln = rare earth; A = Ca, Sr) are especially interesting because long-range ordering of the ...
Charge ordering in the rare earth manganates: the experimental situation

Rao, C N R; Arulraj, Anthony; Cheetham, A K; Raveau, Bernard (IOP Publishing Ltd, 2000-02-21)

Charge-ordered phases of rare earth manganates are novel manifestations arising from interactions between the charge carriers and phonons, giving rise to the localization of carriers at specific sites in the lattice below ...
Magnetic excitations in charge-ordered Nd0.5Ca0.5MnO3: A Brillouin scattering study

Murugavel, P; Narayana, C; Sood, A K; Parashar, S; Raju, A R; Rao, C N R (E D P Sciences, 2000-11)

Brillouin scattering studies on single crystals of a charge-ordered manganite, Nd0.5Ca0.5MnO3, have been carried out for the first time. The spectra show two modes at similar to 27 GHz (B-mode) and 60 GHz (S-mode). The ...
An electron paramagnetic resonance study of Pr0.6Ca0.4MnO3 across the charge-ordering transition

Gupta, Rajeev; Joshi, Janhavi P; Bhat, S V; Sood, A K; Rao, C N R (IOP Publishing Ltd, 2000-07-31)

We report the first electron paramagnetic resonance studies of single crystals and powders of Pr0.6Ca0.4MnO3 in the 300-4.2 K range, covering the charge-ordering transition (T-CO) at similar to 240 K and antiferromagnetic ...
Nonlinear conduction in charge-ordered Pr0.63Ca0.37MnO3: Effect of magnetic fields

Guha, Ayan; Raychaudhuri, A K; Raju, A R; Rao, C N R (American Physical Society, 2000-09-01)

Nonlinear conduction in a single crystal of charge-ordered Pr0.63Ca0.37MnO3 has bren investigated in an applied magnetic field. In zero field, the nonlinear conduction, which starts at T< T-CO, can give rise to a region ...
Effect of Cation Size and Disorder on the Structure and Properties of the Rare Earth Cobaltates, Ln0.5A0.5CoO3 (Ln = Rare Earth, A = Sr, Ba)

Vanitha, P V; Arulraj, Anthony; Santhosh, P N; Rao, C N R (American Chemical Society, 2000-06)

The structure of Ln(0.5)Sr(0.5)CoO(3) is rhombohedral (R (3) over bar c) when Ln = La, Pr, or Nd, but orthorhombic (Pnma) when Ln = Gd. The Ln(0.5)Ba(0.5)CoO(3) compounds, except for Ln = La, are orthorhombic (Pmmm). The ...
Magnetic field resulting from nonlinear electrical transport in single crystals of charge-ordered Pr0.63Ca0.37MnO3

Guha, Ayan; Khare, N; Raychaudhuri, A K; Rao, C N R (American Physical Society, 2000-11-01)

In this paper we report that the current induced destabilization of the charge ordered (CO) state in a rare-earth manganite gives rise to regions with ferromagnetic correlation. We did this experiment by measuring the I-V ...
A Brillouin scattering study of the quasi-one-dimensional blue bronze, K0.3MoO3

Murugavel, P; Narayana, Chandrabhas; Sood, Ajay K; Rao, C N R (IOP Publishing Ltd, 2000-03-27)

Brillouin scattering measurements have been carried out for the first time on K0.3MoO3 The spectrum reveals two bulk modes at 18 and 27 GHz and a Rayleigh surface mode at 6 GHz. Both the bulk modes and the surface mode ...
A study of ferroelectric thin films deposited on a LaNiO3 barrier electrode by nebulized spray pyrolysis

Murugavel, P; Sharma, Rajat; Raju, A R; Rao, C N R (IOP Publishing Ltd, 2000-04-21)

Thin films of ferroelectric PbTiO3 (PT) and Pb(Zr0.5Ti0.5)O-3 (PZT) as well as antiferroelectric PbZrO3 (PZ) have been prepared on LaNiO3/SiO2/Si substrates by nebulized spray pyrolysis (NSP) of metal-organic precursors. ...
An In Vitro, Short-Term Culture Method for Mammalian Haploid Round Spermatids Amenable for Molecular Manipulation

Dehnugara, Tushna; Dhar, Surbhi; Rao, M R S (Wiley-Blackwell, 2012-01)

Extensive chromatin remodeling is a characteristic feature of mammalian spermiogenesis. To date, methods for the molecular manipulation of haploid spermatids are not available as there is a lack of a well-established culture ...
Three-Dimensional Open-Framework Cobalt(II) Phosphates by Novel Routes

Natarajan, Srinivasan; Neeraj, S; Choudhury, Amitava; Rao, C N R (American Chemical Society, 2000-03-03)

Two new three-dimensional open-framework cobalt phosphates, [C2N2H10](2)[Co-4(PO4)(4)]H2O. It and [C4N3H16](3)- [Co-6(PO4)(5)(HPO4)(3)]H2O, II, have been prepared by the reaction of amine phosphates with Co2+ salts. X could ...
Hybrid Open-Framework Iron Phosphate-Oxalates Demonstrating a Dual Role of the Oxalate Unit

Choudhury, Amitava; Natarajan, Srinivasan; Rao, C N R (WILEY-VCH Verlag GmbH, 2000)

New inorganic-organic hybrid open-framework materials of the phosphate-oxalate family, $[Fe_2(H_2O)_2(HPO_4)_2(C_2O_4)]H_2O\cdot(I)$, $[Fe_2(H_2O)_2(HPO_4)_2(C_2O_4)]_2 H_2O\cdot(II)$, $[C_3N_2H_1_2][Fe_2(HPO_4)_2(C_2O_4)_{1.5}]_2 ...
Exploration of a Simple Universal Route to the Myriad of Open-Framework Metal Phosphates

Rao, C N R; Natarajan, Srinivasan; Neeraj, S (American Chemical Society, 2000-03-29)

The reaction of a single amine phosphate, piperazine phosphate, with Zn-II ions is shown to yield a variety of open-framework metal phosphate structures. It is noteworthy that the reaction of this amine phosphate with Zn-II ...

Now showing items 2201-2220 of 2767

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