Ho5Si3Hx hydrides (2

We measure the evolution of the optical transmission (200–760 nm) and the electrical resistivity of Ho films, 50 nm thick, as a function of H concentration up to 2.9 [H]/[Ho]. The Ho films are covered with a 15 nm thick Pd overcoat for hydrogenation and ex situ measurements. Concentration is me...

The energy of formation of holmium trifluoride was measured by direct fluorination of holmium metal in a bomb calorimeter. From the experimental results the following values were determined: the standard enthalpy of formation ΔHfo(HoF3, c, 298.15 K) = −(1698 ± 6) kJ mol−1 and the standard Gibb...

Publisher SummaryThis chapter deals with the trends and developments in the field of organometallic-lanthanide hydride chemistry. This chemistry was born with the pioneering works published in the early 80s. This delay, in comparison with the late d-element hydride chemistry, has several reasons...

Organolanthanide chloride complexes [(CH3OCH2CH2C5H4)2Ln(μ-Cl)]2 (Ln = La, Pr, Ho and Y) react with excess NaH in THF at 45°C to give the dimeric hydride complexes [(CH3OCH2CH2C5H4)2Ln(μ-H)]2, which have been characterized by IR, 1H NMR, MS and XPS spectroscopy, elemental analyses and X-ray c...

Hydrogensorption properties and thermal stability of HoH2, HoH3 and LuH3 hydrides have been studied with the use of thermodesorption and X-ray absorption spectroscopy methods. A charge transfer from a metal to hydrogen was determined through the LIII-absorption spectra shift in these hydrides. T...

5,10,15,20-Tetra-[(p-alkoxy-m-ethyloxy)phenyl]porphyrin and [5-(p-alkoxy)phenyl-10,15,20-tri-phenyl]porphyrin and their holmium(III) complexes are reported. They display a hexagonal columnar discotic columnar (Colh) liquid crystal phase and were studied by cyclic voltammetry, surface photovoltag...

The intermetallic compound HoCu is hydrogenated to form a composition HoCuH3. Magnetic properties of the hydride have been studied by magnetization, low temperature heat capacity and electrical resistivity measurements. While HoCu is antiferromagnetic with a Néel temperature of ∼27 K, the hydr...

The characteristics of hydride phase development in bulk uranium and holmium were studied utilizing metallographic examinations of partially hydrided samples. It has been found that the precipitation of the hydride phase during the reaction with gaseous hydrogen occurs, in the case of uranium, o...

The kinetics and topochemistry of the hydriding reaction of parallelepiped shaped holmium samples under 1 bar H2 at the temperature range 320–570 K were studied using pressure drop measurements and hot stage microscopy (HSM) direct observations. It is shown that the kinetic curve can be separat...

The goal of the present study was to develop zinc-doped calcium phosphate bone cements (CPCs-Zn) for functionalized bone grafts applications. An aqueous co-precipitation process for synthesis of β-tricalcium phosphate (β-TCP) powder samples with Zn addition ranging from 0 wt% up to 1.2 wt% was...

The history of zinc phosphate dental cements and a theoretical basis of the syntheses of these ceramics are provided. They were the first chemically bonded phosphate ceramics (CBPCs) developed and used as dental cements, and hence their mineralogical composition has been well studied. The litera...

Samples of Zinc-Phosphate glasses and modified with CuO and CdCl2 Zinc-Phosphate glasses have been prepared by melt quench technique. The influences of doping of CuO and CdCl2 on electrical and dielectric properties of the glasses were investigated over a range of frequency of 100Hz - 1MHz and a...

ObjectivesZinc-doped dentine adhesives have been recently advocated to interfere with metallo-proteinases-mediated collagen degradation. Nevertheless, there is a little information about the effects of zinc ions on the chemical interaction of self-etch functional monomers to dentine. The aim of ...

Zinc Phosphate (ZP), polypyrrole (PPy) and ZP/PPy coatings were electro-electrodeposited on 304 stainless steel (SS) using galvanostatic mode for application as a corrosion protector. The morphology of different coatings on the surface of stainless steel was observed by scanning electron microsc...

The photophysical behaviours of quinoline based red fluorescent zinc complex (QAZn) in the presence of the highly toxic AsO2− and biologically active H2PO4− ions have been explored in aqueous DMSO solution. The sequential detection of both the anions was examined using absorption and fluorescenc...

H3PO4 is commonly used as a proton-conducting phase in high temperature proton exchange membrane fuel cell membranes. However, its reduction with hydrogen at elevated temperatures yields compounds like H3PO3 and phosphorus. The aim of this work was to describe the basic electrochemical behaviour...

Pseudo-ordered macroporous iron-phosphorous (Fe-P) films have been electrodeposited potentiostatically from a citrate-sulfate bath onto Au surfaces pre-patterned with a colloidal crystal mask of polystyrene spheres of 350 nm in diameter. The electrolyte contained sodium hypophosphite as the P so...

Phosphorous is an essential limiting nutrient for which there is no substitute. Its efficient recovery from sewage treatment plants is important to mitigate both dependence on limited reserves of exploitable phosphate rock and eutrophication of surface waters. Here, we evaluate the use of calciu...

The reaction of UO3 and H3PO3 at 100 °C and subsequent reaction with dimethylformamide (DMF) produces crystals of the compound (NH2(CH3)2)[UO2(HPO2OH)(HPO3)]. This compound crystallizes in space group P21/n and consists of layers of uranyl pentagonal bipyramids that share equatorial vertices wi...