EFECT OF SINTERING METHOD ON MICROSTRUCTURE OF ND0.4SR1.6NIO4–D CERAMICS
Abstract
Two different methods have been employed for fabrication of Nd0.4Sr1.6NiO4–d ceramics with focus on the microstructure and density of ceramic samples. Conventional sintering at 1100–1300 °C has been found to yield porous materials. Rapid grain growth at ≥1 300 °C induces the development of microcracks associated with a strongly anisotropic expansion of
Nd0.4Sr1.6NiO4–d tetragonal lattice. On the contrary, spark plasma sintering (SPS) at 1100 °C enables fabrication of dense gastight ceramics, but is accompanied by the structural transformation from tetragonal (I4/mmm) to orthorhombic (Immm) symmetry due to oxygen losses from the lattice under low-p(O2) conditions of SPS process. The post-treatment conditions were optimized to oxidize sintered samples and to restore tetragonal structure while preserving gas-tightness of ceramics.
Nd0.4Sr1.6NiO4–d tetragonal lattice. On the contrary, spark plasma sintering (SPS) at 1100 °C enables fabrication of dense gastight ceramics, but is accompanied by the structural transformation from tetragonal (I4/mmm) to orthorhombic (Immm) symmetry due to oxygen losses from the lattice under low-p(O2) conditions of SPS process. The post-treatment conditions were optimized to oxidize sintered samples and to restore tetragonal structure while preserving gas-tightness of ceramics.
About the Authors
E. S. Kravchenko
Belarusian State University, CICECO – Aveiro Institute of Materials, University of Aveiro, Stockholm University
Belarus
M.Sc. degree, Ph.D. student Department of Chemistry
Belarus
M.Sc. degree, Ph.D. student Department of Chemistry
A. A. Yaremchenko
CICECO – Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro
Portugal
D. degree, Principal Researcher.
Portugal
D. degree, Principal Researcher.
J. Grins
Department of Materials and Environmental Chemistry, Stockholm University
Sweden
Ph.D. degree, Researcher.
Sweden
Ph.D. degree, Researcher.
G. Svensson
Department of Materials and Environmental Chemistry, Stockholm University
Sweden
Ph.D. degree, Professor, Head of the Department
Sweden
Ph.D. degree, Professor, Head of the Department
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