TY - JOUR

T1 - Organic solutions of niobium oxalate complexes for preparing Sr2AlNbO6 ceramic as a possible thermal barrier material

AU - Abramov, Pavel A.

AU - Kuznetsov, Artem B.

AU - Gulyaev, Igor P.

AU - Volchek, Victoria V.

AU - Shutilov, Roman A.

AU - Zolotova, Evgeniya S.

AU - Suprun, Evgeny A.

AU - Kardash, Tatyana Yu

AU - Solodovnikov, Sergey F.

N1 - The main part of this work related to preparing solutions, adapting the spraying technique for SAN and analysis of data was supported by the Russian Science Foundation, grant No. 23-13-00117 (https://rscf.ru/project/23-13-00117/). The authors wish to thank Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, for providing samples of (NH4)[NbO(C2O4)2(DMSO)2]·DMSO. The microstructural and mechanical characteristics of SAN coating were determined using the equipment of the Shared Research Center "Mechanics" (ITAM SB RAS). Analytical measurements were performed at Shared Research Facilities for Multi-elemental and Isotope Research of Sobolev Institute of Geology and Mineralogy SB RAS.

PY - 2026/9

Y1 - 2026/9

N2 - New approaches to preparing powder and ceramics of double perovskite Sr2AlNbO6 (SAN) are presented. In addition to the conventional solid-state method, we employed organic solvents, sol-gel synthesis and liquid precursor plasma spraying (LPPS) to deposit SAN ceramic layers. For these purposes, we used a niobium oxalate complex forming stable solutions or gels in DMF with Sr2+ and Al3+ nitrates. We investigated the composition and thermal behavior of solutions, gels and prepared SAN samples and found that DMSO containing Nb precursor yields a stable impurity phase Sr4Al6O12(SO4) inside the final SAN powder. The measured linear thermal expansion coefficient (TEC) of sintered SAN is 12.4 × 10−6 K−1 at 1000 °C, which exceeds that for yttria-stabilized zirconia, YSZ (11 × 10−6 K−1). The LPPS SAN coating contains two phases, identified as SAN and an amorphous oxide. The Young's modulus and Vickers nanohardness of SAN in LPPS-coating are also better than those of YSZ coating deposited with conventional atmospheric plasma spraying (APS).

AB - New approaches to preparing powder and ceramics of double perovskite Sr2AlNbO6 (SAN) are presented. In addition to the conventional solid-state method, we employed organic solvents, sol-gel synthesis and liquid precursor plasma spraying (LPPS) to deposit SAN ceramic layers. For these purposes, we used a niobium oxalate complex forming stable solutions or gels in DMF with Sr2+ and Al3+ nitrates. We investigated the composition and thermal behavior of solutions, gels and prepared SAN samples and found that DMSO containing Nb precursor yields a stable impurity phase Sr4Al6O12(SO4) inside the final SAN powder. The measured linear thermal expansion coefficient (TEC) of sintered SAN is 12.4 × 10−6 K−1 at 1000 °C, which exceeds that for yttria-stabilized zirconia, YSZ (11 × 10−6 K−1). The LPPS SAN coating contains two phases, identified as SAN and an amorphous oxide. The Young's modulus and Vickers nanohardness of SAN in LPPS-coating are also better than those of YSZ coating deposited with conventional atmospheric plasma spraying (APS).

KW - Double perovskite

KW - Liquid precursor plasma spraying

KW - Sol-gel synthesis

KW - Thermal and mechanical properties

KW - Thermal barrier coatings

UR - https://www.scopus.com/pages/publications/105039336548

UR - https://www.mendeley.com/catalogue/f5bc96ed-d639-30e0-95cf-be76f93d27b1/

U2 - 10.1016/j.jssc.2026.126083

DO - 10.1016/j.jssc.2026.126083

M3 - Article

VL - 361

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

M1 - 126083

ER -