Formation of Co ultrathin films on Si(1 1 1): Growth mechanisms, electronic structure and transport

The AES, EELS, AFM and resistance measurement investigations have been performed to determine the growth mechanism, electronic structure and resistance-thickness dependence of Co layers on silicon at the thickness range from submonolayer up to several monolayer coverage. These layers were obtained under UHV high-rate deposition with using re-evaporation of Co from a Ta foil. The layer-by-layer growth of Co on Si(1 1 1) with some light segregation of Si has been found on the AES data. An enlarged and reduced concentration of valence electrons in the interface Si layer at the thickness ranges 0-1 Å and in the Co film at d = 1-2 Å has been observed. Resistance measurement of the Co film showed a fast decrease of the resistance down to some value limited by quantum-size effect in accordance with the formation of a two-dimensional Co phase at d = 1-2 Å.     

TRIIODIDE SALTS OF 4-DIMETHYLAMINO- AND 3-BROMO-1-METHYLPYRIDINIUM: CRYSTAL STRUCTURES AND FEATURES OF NON-COVALENT I⋯I INTERACTIONS IN SOLIDS

Journal of Structural Chemistry - Triiodide salts of pyridinium-derived cations of the composition CatI3 (Cat = 4-dimethylaminopyridinium (1), 3-bromo-1-methylpyridinium (2)) are...     

[Co(NH<Subscript>3</Subscript>)<Subscript>6</Subscript>](WO<Subscript>4</Subscript>)Cl: Synthesis,crystal structure,and thermal properties

The crystal structure of [Co(NH₃)₆](WO₄)Cl complex salt is determined by single crystal X-ray. The thermal properties are examined, and the products obtained on heating the salt in different gaseous atmospheres are analyzed by powder X-ray diffraction.     

Complex salts (DienH3)[IrCl6](NO3), (DienH3)[PtCl6](NO3), and (DienH3)[IrCl6]0.5[PtCl6]0.5(NO3): Synthesis, structure, and thermal properties

The complex salts ((DienH₃)[IrCl₆](NO₃) (I), (DienH₃)[PtCl₆](NO₃) (II), and (DienH₃)[IrCl₆]_0.5[PtCl₆]_0.5(NO₃) (III) (where Dien is NH₂(CH₂)₂NH(CH₂)₂NH₂) were synthesized and characterized by elemental, X-ray diffraction, and thermal analyses and by electronic and IR spectroscopies. Solid solution of the composition Ir_0.35Pt_0.65 was obtained by decomposition of compound III in the atmosphere of hydrogen. Original Russian Text ? E.V. Makotchenko, I.A. Baidina, P.E. Plusnin, L.A. Sheludyakova, Yu.V. Shubin, S.V. Korenev, 2007, published in Koordinatsionnaya Khimiya, 2007, Vol. 33, No. 1, pp. 47–54.     

Specific features of the phase formation,synthesis, and growth of ZnMoO4 crystals

The ZnO-MoO₃ phase diagram in the range of ZnO compositions from 0.95 to 1.05 mol % is refined by differential scanning calorimetry. Data on crystal stoichiometry are obtained using the weighting method by reducing ZnMoO₄ in a hydrogen atmosphere. The specific features of solid-phase synthesis of ZnMoO₄ are studied, and its heat of fusion is measured. The modes of solid-phase synthesis and growth of ZnMoO₄ crystals are optimized. Some experimental data on the ZnMoO₄ crystal growth in the [001] direction by the low-thermal gradient Czochralski method are presented. Crystals with a cross section of ～50 × 50 mm², a length of 160 mm, and a weight up to 1 kg have been obtained.     

A study of complexation between crystalline <Emphasis Type="Italic">trans</Emphasis>-[Pd(H<Subscript>2</Subscript>O)<Subscript>2</Subscript>(NO<Subscript>3</Subscript>)<Subscript>2</Subscript>] and acetylacetone

Complexation between crystalline trans-[Pd(H₂O)₂(NO₃)₂] and acetylacetone was studied. The complexes Pd₂(Acac)₂(μ-NO₃)₂(I) and Pd₂(Acac)₂(μ-Acac)(μ-NO₃)(II) were obtained and examined by elemental analysis, X-ray powder diffraction analysis, differential scanning calorimetry, simultaneous thermal analysis, mass spectrometry, and vibrational spectroscopy.     

Synthesis, crystal structure and thermal properties of [Co(NH3)5Cl]MO4 (M = Mo, W)

Crystal structures of [Co(NH₃)₅Cl]MoO₄ and [Co(NH₃)₅Cl]WO₄ complex salts are determined by single crystal X-ray diffraction. It is demonstrated for both salts that within the temperature range T = ?123?20°C there is a negative thermal expansion (about 0.26%) towards the c axis of the orthorhombic unit cell (Pnma space group). Thermal properties of the salts are investigated. The phase composition of the products obtained on heating the salts in different gas atmospheres is studied.