Investigation of flash sintering effects on the NiO-GDC nanocomposites synthesized by one-step method

Usuba, J.; Salvo, C.; Durango, J.; Sanhueza, F.; Jaramillo, A. F.; Arulraj, A.; Mangalaraja, R. V.; Usuba, J.; Salvo, C.; Durango, J.; Sanhueza, F.; Jaramillo, A. F.; Arulraj, A.; Mangalaraja, R. V.

doi:2025.62.5.1068

J. Korean Ceram. Soc. > Volume 62(5); 2025 > Article

Original Article

Journal of the Korean Ceramic Society 2025;62(5): 1068-1076.
doi: https://doi.org/10.1007/s43207-025-00534-w

Investigation of flash sintering effects on the NiO-GDC nanocomposites synthesized by one-step method

J. Usuba¹, C. Salvo², J. Durango³, F. Sanhueza³, A. F. Jaramillo^1,4, A. Arulraj⁵, R. V. Mangalaraja^6,7

¹Department of Mechanical Engineering, Universidad de La Frontera, 01145 Francisco Salazar, 4811230, Temuco, Chile
²Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad del Bío-Bío, Collao No 1202 Casilla 5-C, 4081112, Concepción, Chile
³Electrochemical Technologies and Green Energies Laboratory, Department of Materials Engineering, Faculty of Engineering, University of Concepción, Concepción, Chile
⁴Departamento de Ingeniería Mecánica, Universidad de Córdoba, Cr 6 #76-103, 230002, Montería, Colombia
⁵Departamento de Electricidad, Facultad de Ingeniería, Universidad Tecnológica Metropolitana (UTEM), Av. José Pedro Alessandri 1242, Ñuñoa, 7800002, Santiago, Chile
⁶Facultad de Ingeniería y Arquitectura, Universidad Arturo Prat, Av. Arturo Prat 2120, 1110939, Iquique, Chile
⁷Vicerrectoría de Investigación e Innovación, Universidad Arturo Prat, Av. Arturo Prat 2120, 1110939, Iquique, Chile

Correspondence

J. Usuba ,Email: jonathan.usuba@ufrontera.cl
R. V. Mangalaraja ,Email: mramalinga@unap.cl

Received: November 6, 2024; Revised: July 3, 2025 Accepted: July 22, 2025. Published online: August 6, 2025.

ABSTRACT

The influence of the composition of nickel oxide–gadolinium doped ceria (NiO-GDC) on the onset conditions for flash sintering was investigated. The lowest flash onset temperature was achieved for 50:50 wt.% of NiO:GDC in the three electric fields applied (50, 70, and 100V/cm) and laid between 126 and 195 °C, which was slightly lower than pure NiO and much lower than GDC. The results obtained were differed from those reported in the literature, where the flash onset temperature in a ceramic composite system reached the lowest value for the pure and most conductive phase. The electrical properties and microstructure of NiO-GDC are discussed as responsible for the discrepancy.

Key words: NiO-GDC nanocomposite · One-step synthesis · Flash sintering · Microstructure