We have studied single crystals of C70 by Raman scattering and photoluminescence in the pressure range from 0 to 31.1 GPa. The Raman spectrum at 31.1 GPa shows only a broadband similar to that of the amorphous carbon without ...

In situ EXAFS investigations have been carried out on Ni/γ-Al2O3 and Cu-Ni/γ-Al2O3 catalysts with different metal loadings, and prepared by different procedures. As-prepared Ni/γ-Al2O3 on calcination gives NiO and NiAl2O4-like ...

The n = 1 and n = 3 members of the new (Tl, Pb)Srn+1CunO2n+3 series of cuprates possess primitive tetragonal structures. While the n =3 member is superconducting (Tc ∼ 60K), the n =1 member is metallic immaterial of the ...

Copper(II) acetate dimer and [Mn-II(bipy)(2)](2+) encapsulated in cubic Al-MCM-48 show high catalytic activity in the oxidation of phenol to catechol by oxygen activation, and of styrene to styrene oxide by singlet oxygen, ...

Nebulized spray pyrolysis of metal-organic precursors in methanol solution has been employed to prepare powders of TiO2, ZrO2 and PbZr0.5Ti0.5O3 (PZT). This process ensures complete decomposition of the precursors at ...

Gas-phase pyrolysis of acetylene along with a metallocene or with a binary mixture of metallocenes in flowing Ar or Ar + H2 at 1100°C yields single-walled carbon nanotubes. Pyrolysis of Fe(CO)5-acetylene mixtures in Ar at ...

By the co-crystallization of trimesic acid, TMA, with molecules such as dimethylamine, N,N,N',N' -tetramethylethylenediamine and methanol, it has been possible to generate hydrogen-bonded four-membered networks of TMA. The ...

We present the results for the temperature and field dependence of the magnetic for ceramic materials of the composition La2−xMxNiO4, with M=Sr or Ca and 0≤x≤0.4. The onset of a strong diamagnetism has been observed at ...

YbBa2Cu3O7−δ with a Tc (zero-resistance) of 89K has been prepared without contamination of Yb2BaCuO5. Monophasic LuBa2Cu3O7−δ cannot be prepared. Solid solutions of the type Y1 xLuxBa2Cu3O7−δ (0.0 < x ≤ slant 0.75) are, ...

Reaction of a mixture of neodymium carbonate, HCl, oxamic acid and glutaric acid under hydrothermal conditions gives rise to a new mixed carboxylate of neodymium, [Nd-4(H2O)(2)(OOC(CH2)(3)COO)(4)(C2O4)(2)], I. The structure, ...