Ferrocenylphosphazenes have been attracting increasing attention for their special properties and potential applications. We describe here a new high-throughput synthesis of cross-linked poly(cyclotriphosphazene-co-bis(aminomethyl)ferrocene) microspheres via the polycondensation of hexachlorocyc...

Cationic cyclopentadienyl iron complexes of arenes are applied in photopolymerization and photocatalysis because of their good photophysical and photochemical properties. In this study, a series of cationic cyclopentadienyl iron complexes with diphenylacetylene chromophores (Aky-Fc) was obtained...

The standard enthalpies of formation for some Dysprosium alloys in the binary systems Dy-X (where X = C, Si, Ge, Sn, B) have been determined by direct synthesis calorimetry at 1473 ± 2 K. The following values of ΔHf0 in kJ mol−1 of atoms are reported: DyC2, −28.6 ± 2.0; DySi, −68.9 ± 2.0; Dy...

Four rare-earth dicarbides and a yttrium carbide (average composition YC1.6) have been prepared and hydrolysed using water or mineral acids. The hydrolysis products, gaseous hydrocarbons, were determined using gas-liquid chromatography. The preparation from the oxide and carbon appears to procee...

The magnetic and electrical properties of the CaC2-type rare earth dicarbides are reported. The Néel temperatures and magnetic resistivities of heavy rare earth dicarbides are discussed in the light of the Ruderman-Kittel-Kasuya-Yosida theory. The magnetic resistivities of the solid solutions C...

The equilibrium CO(g) pressures have been determined over the univariant three-phase field DyO1.5(s)–C(s)–DyC2(s) by means of the dynamic effusion MS method, in the temperature range 1360–1590 K. The carbide phase was generated in situ by the carbothermic reduction of the oxide using a quadru...

The change in surface compositional and bulk structural characteristics of the natural ruby stone, before and after heat treatment with lead oxide has been analyzed using two advance characterization techniques like: X-ray micro CT scan (μ-CT) and electron probe micro analyzer (EPMA). The analy...

Rubies (Cr: Al2O3 single crystals) with 0.025–0.4 mol% Cr2O3 were prepared by the optical floating zone method, and characterized by X-ray diffraction (XRD), electron paramagnetic resonance (EPR) spectroscopy, optical transmission and photoluminescence (PL). Crystals were free of inclusions and...

The surface behavior of the natural ruby stones before and after heat treatment with metal oxide additives like: zinc oxide (ZnO) and lead oxide (PbO) have been studied. The surface appearance of the ruby stones processed with the metal oxides changed whereas the bulk densities of the stones rem...

Red colored bright visible light fracto-mechanoluminescence was observed successfully from ruby (Cr doped Al2O3) and Cr doped spinel (Cr doped MgAl2O4) crystals in mechanical processes such as cutting, grinding and polishing. Fracto-mechanoluminescence spectra from ruby (peaking at λ=696 nm) an...

Ion beam analysis (IBA) is a set of well known powerful analytical techniques which use energetic particle beam as a probe. Among them, two techniques are suitable for gemological analysis, i.e., Particle Induced X-rays Emission (PIXE) and Ionoluminescence (IL). We combine these two techniques f...

Microwave-assisted solution technique (MAST) was used for the homogeneous doping of Cr3+ in nanoporous anodic alumina (NAA) which when heat-treated transforms into nanoporous ruby. The rise in annealing temperature led to the phase transition in the sequence: amorphous- δ- θ- α-alumina as evi...

Improvement in aesthetic look of low grade natural ruby (gemstone) surface was clearly evident after fusion mixture treatment. Surface impurities of the gemstone were significantly reduced to give it a face lift. The processing consists of heat treatment (1000 °C) of the raw gemstone with fusio...

Particularly in hot climates, various pigments are used to formulate desired non-white colors that stay cooler in the sun than alternatives. These cool pigments provide a high near-infrared (NIR) reflectance in the solar infrared range of 700–2500 nm, and also a color specified by a reflectance...

Seven oleanane-type glycosides were extracted and isolated by various chromatographic methods from the roots of Weigela x “Bristol Ruby” (1–7), six previously undescribed (1–6) and a known one (7). Their structures were assigned by spectroscopic analysis mainly 2D NMR and mass spectrometry (...

In this work, ruby (Cr doped Al2O3 bulk crystal) with the size of ∅10×21 mm was grown by the flame fusion technique (FFT). Absorption spectrum was carried out in the range of 300–800 nm by spectrophotometer, It shows 2 absorption peaks of Cr3+ in ruby near 400 nm and 550 nm . The crystal struc...

Mechanochemical effects were investigated in the mixture of a rare earth compound (Nd(NO3)3·6H2O, NdCl3·6H2O, Nd2(CO3)3·8H2O, Ce(NO3)3·6H2O, CeCl3·7H2O, or Ce2(CO3)3·8H2O) and (NH4)2HPO4. These mixtures were ground and then heated. These ground mixtures and thermal products were characteri...

The synthesis mechanism of CsCaNd(PO4)2 from nitrates, carbonates and oxides of the different cations was investigated with the aim of immobilizing cesium. Two transitory phases, a monazite-type one, NdPO4, and a poorly crystallized cesium phosphate, CsCaPO4, were proposed to explain the formati...

Cerium-based materials have shown good results when applied as inorganic UV filters, either absorbing and/or scattering light. Although most papers report the use of Ce(IV), Ce(III) has shown better results for UV protection applications, confirmed by photocatalysis involving the degradation of ...

Thorium incorporation in the rhabdophane structure as Pr1-2xCaxThxPO4·nH2O solid solutions was successfully achieved and resulted in the preparation of a low temperature precursor of the monazite-cheralite type Pr1-2xCaxThxPO4. The rhabdophane compounds are considered as potential neoformed pha...