TY - JOUR

T1 - E-beam sintering of neodymium tungstate and its composite with nickel (II) and copper (II) oxides

AU - Eremeev, Nikita

AU - Sadovskaya, Ekaterina

AU - Krieger, Tamara

AU - Bulavchenko, Olga

AU - Kaichev, Vasily

AU - Kremneva, Anna

AU - Suprun, Evgeny

AU - Mohammed, Mostefe Khalid

AU - Mikhailenko, Mikhail

AU - Korobeynikov, Mikhail

AU - Sadykov, Vladislav

AU - Bespalko, Yulia

N1 - This work was supported by the Russian Science Foundation, Project No. 23-73-00045. Mathematical modeling of isotope exchange data was performed in the framework of the budget project of the Boreskov Institute of Catalysis SB RAS (project FWUR-2024-0038).

PY - 2026

Y1 - 2026

N2 - Neodymium tungstates and their composites with metal alloys, such as NiCu, have emerged as promising materials for hydrogen separation membranes due to their high proton conductivity and stability in CO2-containing atmospheres. The fabrication of gas-tight ceramics based on these materials constitutes a distinct challenge. A promising approach to address this issue is the utilization of advanced sintering techniques, such as radiation-thermal sintering using an electron beam. The present study investigates the impact of radiation-thermal sintering temperature on the structural, textural properties, hydration ability, and oxygen mobility of Nd5.5WO11.25−δ oxides and NiO–CuO–Nd5.5WO11.25−δ composites, the precursors of NiCu alloy – Nd5.5WO11.25−δ materials for hydrogen separation membranes. The main phase of the Nd5.5WO11.25−δ samples is defective double fluorite, while their composites contain various nickel and copper oxides along with the neodymium tungstate phase. The attainment of gas-tightness in Nd5.5WO11.25−δ samples is achieved even at relatively low sintering temperatures (1200–1300 °C), which is unattainable through sintering in a furnace. Conversely, the composite samples exhibit high porosity. Hence, the procedure of preparing the NiO–CuO–Nd5.5WO11.25−δ composites required further optimization. Nd5.5WO11.25−δ sintered by e-beam at 1100–1300 °C exhibit optimal hydration properties. The highest oxygen mobility is demonstrated for the samples sintered at 1100 and 1200 °C (D* up to ~ 10−8 cm2 /s), which is promising in the context of the incorporation and transport of protons in hydrogen separation membranes. Consequently, e-beam sintering emerges as a promising method for producing proton conductive ceramics based on Nd tungstate.

AB - Neodymium tungstates and their composites with metal alloys, such as NiCu, have emerged as promising materials for hydrogen separation membranes due to their high proton conductivity and stability in CO2-containing atmospheres. The fabrication of gas-tight ceramics based on these materials constitutes a distinct challenge. A promising approach to address this issue is the utilization of advanced sintering techniques, such as radiation-thermal sintering using an electron beam. The present study investigates the impact of radiation-thermal sintering temperature on the structural, textural properties, hydration ability, and oxygen mobility of Nd5.5WO11.25−δ oxides and NiO–CuO–Nd5.5WO11.25−δ composites, the precursors of NiCu alloy – Nd5.5WO11.25−δ materials for hydrogen separation membranes. The main phase of the Nd5.5WO11.25−δ samples is defective double fluorite, while their composites contain various nickel and copper oxides along with the neodymium tungstate phase. The attainment of gas-tightness in Nd5.5WO11.25−δ samples is achieved even at relatively low sintering temperatures (1200–1300 °C), which is unattainable through sintering in a furnace. Conversely, the composite samples exhibit high porosity. Hence, the procedure of preparing the NiO–CuO–Nd5.5WO11.25−δ composites required further optimization. Nd5.5WO11.25−δ sintered by e-beam at 1100–1300 °C exhibit optimal hydration properties. The highest oxygen mobility is demonstrated for the samples sintered at 1100 and 1200 °C (D* up to ~ 10−8 cm2 /s), which is promising in the context of the incorporation and transport of protons in hydrogen separation membranes. Consequently, e-beam sintering emerges as a promising method for producing proton conductive ceramics based on Nd tungstate.

KW - composite

KW - neodymium tungstate

KW - radiation-thermal sintering

KW - structural characteristics

KW - textural characteristics

KW - thermogravimetric analysis

UR - https://www.scopus.com/pages/publications/105051590780

UR - https://www.mendeley.com/catalogue/a7c36854-252d-3e24-975c-ad338f42d201/

U2 - 10.15826/elmattech.2026.5.077

DO - 10.15826/elmattech.2026.5.077

M3 - Article

VL - 5

JO - Electrochemical Materials and Technologies

JF - Electrochemical Materials and Technologies

SN - 2949-0561

IS - 3

M1 - 20265077

ER -