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The NaY(MoO4)2:Yb3+/Tm3+ single crystal was grown by the vertical Bridgman method using spontaneous crystallization. After annealing at 850 C for 24 h in a muffle furnace under an air atmosphere, the obtained light black crystal became transparent and optically clear. Powder X-ray diffraction (PXRD) confirmed that the as-grown crystal had the structure of scheelite. The segregation coefficients of Tm3+ and Yb3+ were 0.589 and 0.588, respectively. Under 980 nm excitation, the temperature dependence of the emission intensity of the crystal in the temperature range of 298-473 K was measured. The results show that, because of the thermal quenching effect, the emission intensity decreases as the temperature rises. The possible energy transfer modes between Yb3+ and Tm3+ ions were analyzed. The emission cross section was calculated to be 1.97 10-20 cm2 by the Füchtabauer-Ladeburg formula, and the fluorescence lifetime was fitted to be 166.67 us. [ABSTRACT FROM AUTHOR]

The article reports that researchers from the University of Manchester examined the effect of thermal ageing on microstructural characteristics and elastic properties of ytterbium-based silicates. Topics include the silicates are the generation of environmental barrier coating materials that demonstrate high temperature stability and low steam; and Thermochemical and thermomechanical stability of both ytterbium disilicate and ytterbium monosilicate in aerospace engine working environments.

The article reports on the change in the standard atomic weight of ytterbium from 173.054 to 173.045 as approved by the International Union of Pure & Applied Chemistry (IUPAC) in August 2015.

Reports on a discovery that an electrically conductive compound of ytterbium, gallium and germanium has been shown to maintain its room-temperature volume when heated. Potential applications of electrically conducting zero-thermal-expansion materials; Electronic mechanism; Anomalous thermal expansion behavior.