Microstructure evolution of Cr2AlC MAX phase under a graphite bed between 1100 °C and 1500 °C

Electronic spectroscopy and ionization potentials for YbOH and YbOCH3

“…Direct 𝐵 $ 2 S + (0,0 0 ,0)-𝑋 $ 2 S + (0,0 0 ,0) excitation of YbOH is relevant to laser cooling and optical detection schemes in a manor analogous to the role that the 𝐵 $ 2 S + (0,0 0 ,0) state plays in the recently demonstrated magneto-optical trapping and sub-Doppler cooling of CaOH [4]. Furthermore, characterization of the 𝐵 $ 2 S + state can validate recent theoretical predictions used to quantify the observed branching ratios relevant to laser cooling of YbOH [11,14]. In that study, it was shown that coupling between the 𝐴 " 2 P and 𝐵 $ 2 S + states mixes some bending motion into the wavefunction for the 𝐴 " 2 P (0,0 0 ,0) level, and thus allows the nominally symmetry forbidden…”

“…Although it was not reported in ref. [11], the separation between the 𝐵 $ 2 S + (0,0 0 ,0) and 𝐴 " 2 P1/2(0,0 0 ,0) states was calculated to be 2935 cm -1 [14] which, when combined with the experimental origin for the 𝐴 " Π !/# (0, 0 $ , 0) − 𝑋 $ Σ % (0, 0 $ , 0)…”

“…transition have significant strength. The theoretical prediction [11,14] places the 𝐵 $ 2 S + (0,0 0 ,0) vibronic level 2935 cm -1 above the 𝐴 " Π !/# (0, 0 $ , 0) # level and predicts a characteristic stretching Yb-OH vibrational spacing of 559 cm -1 . Experimental data on the 𝐵 $ 2 S + state is sought, in part, to gauge the reliability of these theoretical prediction.…”

Formation mechanism of TiC/Al2O3 composite from porous Ti3AlC2 ceramics in 35 vol.% CO‐N2 atmosphere

“…The as‐prepared Ti 3 AlC 2 samples were heated from room temperature to the preset temperature (1100, 1300, and 1500°C) at a rate of 5°C/min in a graphite bed using an electric furnace. And the dwell time at maximum temperature was 3 h. In the process of heat‐treating Ti 3 AlC 2 samples, oxygen from the air would react with graphite to form CO, and the expected atmosphere should mainly consist of 35 vol% CO and 65 vol% N 2 43–45 …”

“…And the dwell time at maximum temperature was 3 h. In the process of heat-treating Ti 3 AlC 2 samples, oxygen from the air would react with graphite to form CO, and the expected atmosphere should mainly consist of 35 vol% CO and 65 vol% N 2 . [43][44][45] The phase composition of heat-treated Ti 3 AlC 2 samples was identified using an X-ray diffractometer (XRD) (Bruker D8 Advance; using Ni filtered, Cu Kα radiation) after grinding the samples up into powders at room temperature. The microstructure of Ti 3 AlC 2 samples' cross-sections was gold-coated and observed under the backscattered electron (BSE) and secondary electron (SE) imaging modes using a field scanning electron microscope (SEM, Nova 400 Nano-SEM, FEI Company, USA) equipped with an energy dispersive X-ray spectroscope (EDS, INCA IE 350PentaFET X-3, Oxford, UK).…”