Infrared photoluminescence and Raman spectra in the Y2O3–ZrO2 system

Enhanced phase stability in hydroxylapatite/zirconia composites with hot isostatic pressing

“…11 and 12, respectively. The frequencies of monoclinic and tetragonal ZrO 2 and HA agree well with those reported in the literature [20][21][22][23]. The spectra for the composite sample show that peaks the structures of HA and monoclinic zirconia were preserved after HIPping and no other peaks were identified.…”

Bifunctional SO4/ZrO2catalysts for 5-hydroxymethylfufural (5-HMF) production from glucose

“…5), and is in accordance with the powder XRD. Losses observed at 180, 307, 337, 381, 476 and 618 cm −1 for ZrO 2 are assigned to the monoclinic phase, 53 while bands evolving at 148, 271, 320, 456 and 645 cm −1 with increasing θ SO 4 are attributable to the tetragonal phase. High sulfate loadings degrade spectral resolution, resulting in poorer discrimination between the monoclinic and tetragonal modes as the monolayer point is reached, reflecting the surface sensitivity of Raman, 54 while new features emerge ~1000 cm −1 characteristic of surface sulphate species (Fig.…”

“…The formation of crystalline species in calcined SZ samples was subsequently explored using powder XRD, (Figure 5), and is in accordance with the powder XRD. Losses observed at 180, 307, 337, 381, 476 and 618 cm -1 for ZrO 2 are assigned to the monoclinic phase, 53 reflecting the surface sensitivity of Raman, 54 while new features emerge ~1000 cm -1 characteristic of surface sulphate species (Figure S3). At low SO 4 loadings a single peak at 997 cm -1 is observed, with a second feature emerging at 1029 cm -1 which grows continuously above 0.2 ML to form a broad feature upon completion of the monolayer.…”

Stabilization of rare earth elements (La, Nd, Pr, Ce) by ZrO₂ concentrate

“…Так, для тетрагонального ZrO 2 , стабилизированного Y 2 O 3 , характерно присутствие шести линий: 149 см -1 (E g ), 269 см -1 (E g ), 319 см -1 (B 1g ), 461 см -1 (E g ), 602 см -1 (А 1g ) и 648 см -1 (B 1g ). Моноклинной фазе соответствуют пики: 179 см -1 (А g ), 190 см -1 (А g ), 222 см -1 (В g ), 305 см -1 (А g ), 334 см -1 (B g ), 348 см -1 (А g ), 381 см -1 (B g ), 476 см -1 (А g ), 500 см -1 (B g ), 534 см -1 (B g ), 556 см -1 (А g ), 615 см -1 (B g ) и 637 см -1 (А g ) [13,14].…”