Raman study of yttria-stabilized zirconia interfacial coatings on Nicalon™ fiber

Atomic force and scanning electron microscopy study of zirconia-coated silicon carbide fibers

“…7a and b). This fact is in good agreement with micro Raman data obtained earlier by Baklanova et al 12 for YSZ coatings on Nicalon TM fibers. The observable difference could be caused by micro heterogeneity of the coating, including the grains sizes, reactivity towards water vapor, presence of defects, the stress level within grains, inhomogeneity of elemental composition of coating.…”

“…Earlier, it was found using micro Raman spectroscopy that the 3YSZ coating on Nicalon TM fiber exposed to air at elevated temperatures underwent the t → m transformation, with the extent of this transformation being different for various areas of the same filament and for various filaments. 12 According to Raman data of this work, the 6Re-ZrO 2 coating on Tyranno-SA TM fiber is composed only Table 1 The parameters used for characterization of the surface roughness of the initial and 6ReZrO 2 -coated Tyranno-SA TM fibers before and after exposition to air at 1000 • C of tetragonal modification before exposition. Additional Raman shifts were detected in micro Raman spectrum after exposition to air at 1000 • C and these peaks could be assigned to monoclinic ZrO 2 according to data.…”

Mechanochemical synthesis and conducting properties of nanostructured rhombohedral scandia stabilized zirconia ceramics

“…The content of 'cubic' phase is higher in partially reduced specimens ZrO 2 /C and ZrO 2 /Cu. Raman spectra usually were used for correct estimation of the phase composition [20,23]. However, for powders of mechanochemical origin this is not possible due to strong disordering.…”

“…protons, admixtures [20,21], effect of agglomeration [20], twinning [22], influence of support [23]. So, preparation of pure ZrO 2 nanopowders by dry high energy ball milling and its characterization by XRD, Raman, SIMS techniques present interest for better understanding processes of ceramic powders synthesis.…”

Study on structural evolution of nanostructured 3mol% yttria stabilized zirconia coatings during low temperature ageing

“…The main reason for using Raman spectroscopy in this study is that the tetragonal and monoclinic polymorphs of zirconia are reported to have distinct and characteristic Raman spectra. [23][24][25] A small amount of tetragonal or monoclinic phase could be detected in a polycrystalline zirconia material by its distinguishing lines. The monoclinic doublet (at 181 and 192 cm −1 ) and the tetragonal bands (around 148 and 264 cm −1 ) are well separated over the range 100-1000 cm −1 .…”