β-cubic phase transition of scandia-doped zirconia solid solution: Calorimetry, x-ray diffraction, and Raman scattering

Abstract

Differential scanning calorimetry and Raman spectroscopy measurements have been performed to investigate the β-cubic (c) phase transition of the compositionally homogeneous ZrO2-22 mol % ScO1.5 solid solution. The enthalpy of transition (1.11 kJ/mol of cation) and thermal hysteresis between β- and c-phases were smaller than those between monoclinic (m) and tetragonal (t) phases of ZrO2, reflecting the structural information that the cell volume ratio of β- to c-phases is smaller than that of m- to t-phases. Raman spectroscopy allowed us to observe the β-c phase transition, and we could obtain Raman spectra of the c-phase in the ZrO2–ScO1.5 system. This result was strongly supported by the observation of x-ray diffraction patterns at high temperatures.

Temperature and stress induced changes of the vibrational response of cubic and rhombohedral 10mol%Sc2O3–1mol%CeO2–ZrO2 ceramics

“…2, especially when spectra are taken using 532 nm Si laser. As it was already reported in [10] the Raman spectrum of rhombohedral phase is rather complex, presented by a characteristic broad continuum with many small peaks rising above background.…”

“…The highly conductive cubic phase is not stable below 650 • C causing the abrupt decrease in ionic conductivity during cooling in the ScZrO 2 [7,8]. It is known that in 11 mol% Sc 2 O 3 -89 mol% ZrO 2 , a cubic to rhombohedral phase transition occurs when the temperature decrease below 600 • C [9,10]. It was reported [11,12] that when ZrO 2 is stabilized with a small amount of CeO 2 along with Sc 2 O 3 , it no longer exhibits an unfavorable phase transition, making this material a very promising option for intermediate temperature electrolytes.…”

Comparative studies on properties of scandia-stabilized zirconia synthesized by the polymeric precursor and the polyacrylamide techniques

“…Small amplitude reflections of the rhombohedric phase (inset of Fig. 5) for the pellet prepared with powders synthesized by the polyacrylamide technique are detected [22,25]. Fig.…”

Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

“…The peak positioned at 620 cm −1 corresponds to the cubic phase. The peak at 372 cm −1 could be assigned to the monoclinic phase and the peaks positioned at 155, 250, 326, 488, and 600 cm −1 are related to the tetragonal phase [28][29][30][31]. For the as-prepared undiffused and Ni-diffused samples, the spectra consist of the main cubic phase and minor tetragonal and monoclinic phases.…”