IPG Photonics

About: IPG Photonics is a based out in . It is known for research contribution in the topics: Laser & Fiber laser. The organization has 903 authors who have published 1241 publications receiving 63339 citations.

Temperature dependence of the pre-edge structure in the Ti K-edge x-ray absorption spectrum of rutile

Abstract: The temperature dependence of the pre-edge features in x-ray absorption spectroscopy is reviewed. Then, the temperature dependence of the pre-edge structure at the K-edge of titanium in rutile TiO2 is measured at low and room temperature. The first two peaks grow with temperature. The fact that these two peaks also correspond to electric quadrupole transitions is explained by a recently proposed theory.

Determination of Total Sulfur Contents in the International Rock Reference Material SY‐2 and Other Mafic and Ultramafic Rocks Using an Improved Scheme of Combustion/Iodometric Titration

Abstract: An extensively modified combustion/iodometric titration method was used for the determination of sulfur in SY-2, a CANMET international rock reference material, in coarse-grained mantle rocks and glassy materials at the microgram level. Replicate analysis (n = 27) of SY-2 demonstrated the potential for this sample to be certified as a reference sample for S. Our mean sulfur concentration (122 ± 3 μg g-1) suggests that the recommended value (0.011% w/w) could underestimate the true value by 10%. The other results compare well with those generated by other more sophisticated techniques such as X-ray fluorescence spectrometry and electron probe microanalysis, whether S is dissolved in glassy materials or occurs as discrete sulfides. Nous avons analyse, a l'aide d'une methode de combustion et de titration iodometrique fortement modifiee, le soufre a des concentrations de l'ordre du μg dans SY-2, une roche materiau de reference international de CANMET, dans des peridotites a gros grain du manteau superieur et des materiaux vitreux. Les analyses dupliquees (n = 27) de SY-2 mettent en evidence les possibilitees de certifier les teneurs en S de cet echantillon. Notre moyenne de concentration (122 ± 3 μg g-1) suggere que la valeur recommandee actuelle (0.011% w/w) pourrait etre sous-estimee de 10%. Les autres resultats sont en tres bon accord avec ceux produits par des methodes plus sophistiquees tels que la microsonde electronique ou la fluorescence de rayons X, que le soufre soit dissout dans du materiel vitreux ou se presente sous forme de sulfures.

Transformations of magnetic mineralogy in rocks revealed by difference of hysteresis loops measured after stepwise heating: theory and case studies

Abstract: SUMMARY A new approach for tracking mineralogical alterations during laboratory stepwise heating experiments is proposed. It uses the hysteresis loop obtained as a difference between the loops measured after thermal treatment at two different consecutive temperatures. Depending on the nature of the mineralogical alterations (the formation of a new ferrimagnetic phase from a paramagnetic one, the thermal transformation of the originally present ferrimagnetic phases, grain size variation) and on their relative intensities, it is possible to distinguish between different cases. The examples shown reveal the significant alteration of magnetic carriers at low temperatures (up to 200°C) which usually is not identified by thermomagnetic analysis of magnetic susceptibility. The low temperature alteration of the remanence carriers has important consequences for the reliability and suitability criteria of palaeointensity determinations.