Volatility studies on single source precursors for LaNiO3 film deposition: Mass spectrometry and thermal analysis

Four volatile heterobimetallic complexes [Ni(Q)La(dik)3] [H2Q = condensation product of 1,2-diaminoethane with salicylic aldehyde or pentane-2,4-dione, Hdik = 1,1,1,5,5,5-hexafluoro-pentane-2,4-dione 1,1,1- trifluoro-5,5,-dimethylhexane-2,4-dione] were selected as prospective single source precursors for LaNiO3 film deposition. Thermal analysis under vacuum, isothermal vacuum sublimation and mass spectrometry were used for comparatively characterizing volatility and thermal stability of the heterobimetallic complexes. The problem of intact sublimation of [Ni(Q)La(dik)3] is discussed in correlation with the nature of the ligands - Q2- and dik- - and solid state features of the complexes

Structure of Organosilicon Dendrimers of Higher Generations

The structure of organosilicon dendrimers of the ninth generation with the four-functional core and butyl terminal groups has been studied by small-angle neutron scattering. It has been demonstrated that the dendrimers are monodisperse objects with an anisometric shape. The partial volume and the average scattering density have been determined using the contrast variation technique. It has been shown that the dendrimers under study are identical in overall sizes and scattering density distribution. It has been revealed that 20% of the overall volume of the dendrimer is accessible for the penetration of the solvent. The distribution of the scattering length density in the dendrimers has been simulated and reconstructed using the Monte Carlo method, and a change in the excluded volume for different contrasts has been revealed. The specific features of the spatial structure of organosilicon dendrimers of higher generations have been discussed

Investigation of microstructure of manganese-ore sinter with metal-containing additions

Translated from Russian (Izv. Vyssh. Uchebn. Zaved., Chern. Metall. 1986 (10) p. 15-18)SIGLEAvailable from British Library Document Supply Centre- DSC:5828.4(M--37172)T / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Combustion synthesis of TiC-based ceramic-metal composites with high entropy alloy binder

International audienceCeramic-metal composites TiC-High-Entropy Alloy (HEA) CoCrFeNiMe (Me = Mn, Ti or Al) were first produced by combustion synthesis method. Self-sustained synthesis occurs due to heat release from exothermic reaction Ti + C = TiC; the binder content was varied between zero and 40-50 wt.%. The combustion velocity and temperature gradually decreased with increasing binder content. Resultant materials consist of TiC grains and two-phase (fcc and bcc) binder. Vickers microhardness (100 g) of compacted cermet materials with 30 wt.% of binder was in the range of 10-17 GPa and increased with increasing bcc to fcc ratio. Based on experimental results and thermodynamic calculations, the mechanism of microstructure formation in TiC-HEA cermets was suggested

Heterobimetallic single-source precursors for MOCVD. Synthesis and characterization of volatile mixed ligand complexes of lanthanides, barium and magnesium β-diketonates with d-element containing ligands

Several heterobimetallic complexes of general formula [(M1Q)mM2(dik)n], where (M1Q) is Cu(salen) or Ni(salen) and M2(dik)n is a lanthanide tris(β-diketonate) or an alkali-earth element bis(β-diketonate) with more or less fluorinated diketonato(-) ligands, have been prepared and structurally characterized. Some of them were submitted to thermal and mass spectrometry analyses, and to isothermal vacuum sublimation tests, in view of their potential use as MOCVD single-source precursors for the deposition of heterobimetallic materials. The study stresses upon the influence of the nature of the diketone, of the M2 cation, and of chemical modification of the salen ligand on the thermal behaviours of the complexes. Some preliminary CVD experiments are also described