Age-hardening characteristics in a dental low-gold alloy composed of 40.0 wt% Au-35.0 wt% Ag-7.9 wt% Pd-7.0 wt% Cu-5.0 wt% In-3.5 wt% Zn-1.5 wt% Sn, were investigated by means of the hardness test, XRD study, SEM observations and EPMA. The following results were obtained. The age-hardening was characterized by a precipitation of Cu-rich alpha2 phase in the a phase. The softening that occurred f...

Octahedrally-coordinated Cr(3+) possesses peculiar spectral features which made easy to identify it in minerals, even in minor amounts. Chromium has been studied in uvarovite and fuchsite by optical and EPR spectra. Optical, EPR, FT-infrared and EPMA studies have also let to determine the presence of Fe(3+) and Ti(3+) and fluid inclusions within uvarovite and fuchsite. Absorption and scattering...

2014 By doping, the electrical behaviour of polyacetylene film was considerably modified leading to the large development of the research in the field of conducting polymers. The aim of this paper is to point out the inhomogeneity of the dopant through the film cross section, in particular with I2 and SbF5. It is also evidenced that errors may be induced by these inhomogeneities in the interpre...

High resolution X-ray maps of Th, U, Pb, and Y in monazite can be used to construct age maps, which reveal the continuous spatial distribution of ages in a single grain of monazite. The age mapping algorithm and three examples are presented to illustrate the capabilities and applications of this mapping technique, the insights it can provide into monazite geochronology in general, and its limit...