Estimation of anharmonic parameters of nano-crystalline Sc2O3 and Nd2O3

Crystallographic structural variations in nano-crystalline Sc2O3 under pressure

“…Error bars correspond to ±1σ. Uncertainties corresponding to bulk modulus parameters of different reports [42][43][44]46] are also plotted. from the figure, the ellipse has a negative slope, implying a negative correlation between the B 0 and B .…”

“…Sc 2 O 3 nanocrystalline powder (99.99% purity, from Alfa Aesar) has been used for the present study. The ambient characterization was carried out using x-ray diffraction and Raman spectroscopy and has been described in detail in our previous report [46], wherein the sample was identified with a cubic structure having a crystallite size of 31 nm. However, prior to the present high-pressure studies, an angle dispersive x-ray diffraction at zero pressure was also recorded for the sake of completeness, and using Rietveld refinement, the purity of phase has been confirmed.…”

“…In all these investigations, the transition pressures, as well as transition routes, do not agree and hence there remains ambiguity about the high-pressure behavior of Sc 2 O 3 . It is worth mentioning that in one of our previous reports, the temperature-dependent behavior of nano-crystalline Sc 2 O 3 was studied and various anharmonic parameters were estimated [46].…”

“…At ambient, a unit cell of Sc 2 O 3 has 16 molecules with a volume per molecule of 59.17 Å 3 . The results of characterization using Raman spectroscopy and assignment of Raman modes have been discussed in detail in reference[46].…”

Controllably Modulating Oxygen Vacancies on Nonstoichiometric Nd−Ce−O Binary Oxides for Low‐temperature Oxidative Coupling of Methane

“…[11] As shown in the enlarged part of the XRD pattern in Figure 1 For Nd 2 O 3 , the Raman characteristic peaks located at 108, 191, and 438 cm À 1 are attributed to E g , A g , and E g vibrations, respectively. [12] For CeO 2 , only one Raman peak at 462 cm À 1 can be observed; this is attributed to the F 2g vibrational mode of cubic fluorite. [13] For Nd 0.1 Ce 0.9 O 1.95 and Nd 0.3 Ce 0.7 O 1.85 , three noticeable Raman vibrational bands at 254, 460, and 580 cm À 1 can be observed, corresponding to the disordered vibrations of oxygen anions in the anion lattice, the F 2g mode of the fluorite crystalline phase, and the vibrations of oxygen vacancies, respectively.…”