La2Zr2O7/LaAlO3 composite prepared by mixing precipitated precursors

Standard

La₂Zr₂O₇/LaAlO₃ composite prepared by mixing precipitated precursors : Evolution of its structure under sintering. / Bespalko, Yu; Kuznetsova, T.; Kriger, T. et al.

In: Materials Chemistry and Physics, Vol. 251, 123093, 01.09.2020.

Research output: Contribution to journal › Article › peer-review

Harvard

Bespalko, Y, Kuznetsova, T, Kriger, T, Chesalov, Y, Lapina, O , Ishchenko, A, Larina, T, Sadykov, V & Stathopoulos, V 2020, 'La₂Zr₂O₇/LaAlO₃ composite prepared by mixing precipitated precursors: Evolution of its structure under sintering', Materials Chemistry and Physics, vol. 251, 123093. https://doi.org/10.1016/j.matchemphys.2020.123093

APA

Bespalko, Y., Kuznetsova, T., Kriger, T., Chesalov, Y., Lapina, O., Ishchenko, A., Larina, T., Sadykov, V., & Stathopoulos, V. (2020). La₂Zr₂O₇/LaAlO₃ composite prepared by mixing precipitated precursors: Evolution of its structure under sintering. Materials Chemistry and Physics, 251, [123093]. https://doi.org/10.1016/j.matchemphys.2020.123093

Vancouver

Bespalko Y, Kuznetsova T, Kriger T, Chesalov Y, Lapina O , Ishchenko A et al. La₂Zr₂O₇/LaAlO₃ composite prepared by mixing precipitated precursors: Evolution of its structure under sintering. Materials Chemistry and Physics. 2020 Sept 1;251:123093. doi: 10.1016/j.matchemphys.2020.123093

Author

Bespalko, Yu ; Kuznetsova, T. ; Kriger, T. et al. / La₂Zr₂O₇/LaAlO₃ composite prepared by mixing precipitated precursors : Evolution of its structure under sintering. In: Materials Chemistry and Physics. 2020 ; Vol. 251.

BibTeX

@article{a47c5e58398140d5911bba1cddfcfd53,

title = "La2Zr2O7/LaAlO3 composite prepared by mixing precipitated precursors: Evolution of its structure under sintering",

abstract = "For La2Zr2O7/LaAlO3 composite prepared by aging (100 °C/10 h) of the mixture of precipitated precursors of La-Zr-O and La-Al-O, evolution of its structural features after sintering in air in the range of 100–1300 °C was investigated by applying XRD, HRTEM, FTIR, Raman and UV–Vis spectroscopies, 27Al MAS NMR and 139La NMR. The initial composite forms a highly dispersed and disordered structure retaining considerable concentrations of residual anions (anions from the initial salts, water molecules and hydrogen bound hydroxyls) due to basic properties of La cations. Stepwise removal of these anions by calcinations results in the crystallization of La2(Al)O2CO3 at 500 °C with complete disordering of the system after heating at 700 °C. These transitions are accompanied by appearance of AlO4 polyhedra. The La-Zr-O- containing phase appeared for the first time at 900 °C as fluorite-like ZrO2 stabilized by La (Al) cations, and LaAlO3 (P2) phase is also observed along with admixtures of La2O3 and La10Al4O21. At 1100 °C fluorite-like ZrO2 converts into the La2Zr2O7 (P1) phase, and in the range of 1100–1300 °C mixed P1 and P2 oxides are the main phases. For P1 phase, structure becomes more ordered at higher sintering temperatures, while for P2 phase in composite the nanodomain structure is still observed in comparison with individual mixed oxide at 1300 °C. The molecular –scale features of domain boundaries in nanostructured La-Zr-O/La-Al-O composite as well as applied inexpensive method of its fabrication provide required bases for a broad practical application of this material for Thermal barrier coatings (TBCs).",

keywords = "Coprecipitation and aging, Pyrochlore/perovskite composite, TBCs, CONDUCTIVITY, LAALO3, BEHAVIOR, GROWTH, THERMAL-BARRIER COATINGS, SPECTRA, LAYER, FEATURES",

author = "Yu Bespalko and T. Kuznetsova and T. Kriger and Yu Chesalov and O. Lapina and A. Ishchenko and T. Larina and V. Sadykov and V. Stathopoulos",

year = "2020",

month = sep,

day = "1",

doi = "10.1016/j.matchemphys.2020.123093",

language = "English",

volume = "251",

journal = "Materials Chemistry and Physics",

issn = "0254-0584",

publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - La2Zr2O7/LaAlO3 composite prepared by mixing precipitated precursors

T2 - Evolution of its structure under sintering

AU - Bespalko, Yu

AU - Kuznetsova, T.

AU - Kriger, T.

AU - Chesalov, Yu

AU - Lapina, O.

AU - Ishchenko, A.

AU - Larina, T.

AU - Sadykov, V.

AU - Stathopoulos, V.

PY - 2020/9/1

Y1 - 2020/9/1

N2 - For La2Zr2O7/LaAlO3 composite prepared by aging (100 °C/10 h) of the mixture of precipitated precursors of La-Zr-O and La-Al-O, evolution of its structural features after sintering in air in the range of 100–1300 °C was investigated by applying XRD, HRTEM, FTIR, Raman and UV–Vis spectroscopies, 27Al MAS NMR and 139La NMR. The initial composite forms a highly dispersed and disordered structure retaining considerable concentrations of residual anions (anions from the initial salts, water molecules and hydrogen bound hydroxyls) due to basic properties of La cations. Stepwise removal of these anions by calcinations results in the crystallization of La2(Al)O2CO3 at 500 °C with complete disordering of the system after heating at 700 °C. These transitions are accompanied by appearance of AlO4 polyhedra. The La-Zr-O- containing phase appeared for the first time at 900 °C as fluorite-like ZrO2 stabilized by La (Al) cations, and LaAlO3 (P2) phase is also observed along with admixtures of La2O3 and La10Al4O21. At 1100 °C fluorite-like ZrO2 converts into the La2Zr2O7 (P1) phase, and in the range of 1100–1300 °C mixed P1 and P2 oxides are the main phases. For P1 phase, structure becomes more ordered at higher sintering temperatures, while for P2 phase in composite the nanodomain structure is still observed in comparison with individual mixed oxide at 1300 °C. The molecular –scale features of domain boundaries in nanostructured La-Zr-O/La-Al-O composite as well as applied inexpensive method of its fabrication provide required bases for a broad practical application of this material for Thermal barrier coatings (TBCs).

AB - For La2Zr2O7/LaAlO3 composite prepared by aging (100 °C/10 h) of the mixture of precipitated precursors of La-Zr-O and La-Al-O, evolution of its structural features after sintering in air in the range of 100–1300 °C was investigated by applying XRD, HRTEM, FTIR, Raman and UV–Vis spectroscopies, 27Al MAS NMR and 139La NMR. The initial composite forms a highly dispersed and disordered structure retaining considerable concentrations of residual anions (anions from the initial salts, water molecules and hydrogen bound hydroxyls) due to basic properties of La cations. Stepwise removal of these anions by calcinations results in the crystallization of La2(Al)O2CO3 at 500 °C with complete disordering of the system after heating at 700 °C. These transitions are accompanied by appearance of AlO4 polyhedra. The La-Zr-O- containing phase appeared for the first time at 900 °C as fluorite-like ZrO2 stabilized by La (Al) cations, and LaAlO3 (P2) phase is also observed along with admixtures of La2O3 and La10Al4O21. At 1100 °C fluorite-like ZrO2 converts into the La2Zr2O7 (P1) phase, and in the range of 1100–1300 °C mixed P1 and P2 oxides are the main phases. For P1 phase, structure becomes more ordered at higher sintering temperatures, while for P2 phase in composite the nanodomain structure is still observed in comparison with individual mixed oxide at 1300 °C. The molecular –scale features of domain boundaries in nanostructured La-Zr-O/La-Al-O composite as well as applied inexpensive method of its fabrication provide required bases for a broad practical application of this material for Thermal barrier coatings (TBCs).

KW - Coprecipitation and aging

KW - Pyrochlore/perovskite composite

KW - TBCs

KW - CONDUCTIVITY

KW - LAALO3

KW - BEHAVIOR

KW - GROWTH

KW - THERMAL-BARRIER COATINGS

KW - SPECTRA

KW - LAYER

KW - FEATURES

UR - http://www.scopus.com/inward/record.url?scp=85083731818&partnerID=8YFLogxK

U2 - 10.1016/j.matchemphys.2020.123093

DO - 10.1016/j.matchemphys.2020.123093

M3 - Article

AN - SCOPUS:85083731818

VL - 251

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

M1 - 123093

ER -

ID: 24092426