TY - JOUR

T1 - Phase formation, stability and heat capacity of ternary TiO2–CeO2–ZrO2 solid solutions

AU - Kurapova, Olga Yu

AU - Golubev, Sergey N.

AU - Konakov, Vladimir G.

AU - Глухарев, Артем Геннадьевич

PY - 2020/2/15

Y1 - 2020/2/15

N2 - Tetragonal zirconia based solid solutions are important materials for thermal barrier coatings (TBCs). The introduction of the third component to binary zirconia systems is regarded as a promising way to design novel high performance TBCs. The work reports the investigation of solid solution formation in ternary TiO2–CeO2–ZrO2 system in the range 600–1100 °C obtained by using co-precipitation from mixed aqueous solution and freeze-drying. Phase evolution and stability of solid solutions were investigated using DSC, qualitative and quantitative XRD analysis with Rietveld refinement technique. The factors affecting the kinetics of phase formation i.e. powders dispersity, agglomerate strength, crystallite size, Ce3+/Ce4+ ratio were studied using PSD, XRD and ESCA techniques. The heat capacity dependence on temperature was measured experimentally for the first time for 5TiO2–9CeO2–86ZrO2 composition via calorimetry technique using DSC. The obtained data significantly contributes to the schematic phase diagram suggested in the literature and allows to choose the optimal synthesis and processing conditions of ternary system compositions for their use for novel TBCs fabrication.

AB - Tetragonal zirconia based solid solutions are important materials for thermal barrier coatings (TBCs). The introduction of the third component to binary zirconia systems is regarded as a promising way to design novel high performance TBCs. The work reports the investigation of solid solution formation in ternary TiO2–CeO2–ZrO2 system in the range 600–1100 °C obtained by using co-precipitation from mixed aqueous solution and freeze-drying. Phase evolution and stability of solid solutions were investigated using DSC, qualitative and quantitative XRD analysis with Rietveld refinement technique. The factors affecting the kinetics of phase formation i.e. powders dispersity, agglomerate strength, crystallite size, Ce3+/Ce4+ ratio were studied using PSD, XRD and ESCA techniques. The heat capacity dependence on temperature was measured experimentally for the first time for 5TiO2–9CeO2–86ZrO2 composition via calorimetry technique using DSC. The obtained data significantly contributes to the schematic phase diagram suggested in the literature and allows to choose the optimal synthesis and processing conditions of ternary system compositions for their use for novel TBCs fabrication.

KW - Freeze-drying

KW - Heat capacity

KW - Phase transitions

KW - Ternary system

KW - Thermal barrier coatings

KW - DURABILITY

KW - ZIRCONIA

KW - THERMAL BARRIER COATINGS

KW - EXPANSION

KW - GENERATION

KW - OPPORTUNITIES

UR - http://www.scopus.com/inward/record.url?scp=85077371830&partnerID=8YFLogxK

U2 - 10.1016/j.matchemphys.2019.122547

DO - 10.1016/j.matchemphys.2019.122547

M3 - Article

AN - SCOPUS:85077371830

VL - 242

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

M1 - 122547

ER -