Related Experiment Video
Updated: Sep 8, 2026

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
Antiferroelectric Phase Transition in Titanite-Type Solid Solutions Na(Nb,Ta)GeO5
Taro Kuwano1, Toshiya Uohashi2, Akitoshi Nakano3
1Department of Materials Science and Engineering, Institute of Science Tokyo, Yokohama226-8501, Japan.
Abstract:
Titanite-type oxides ABMO5 are emerging antiferroelectrics owing to their unique one-dimensional structure. In this study, the predominant role of the B-site off-center displacement on the antiferroelectricity of titanite-type solid solutions Na(Nb,Ta)GeO5 is revealed via dielectric measurements and synchrotron X-ray diffraction experiments. Increasing the Nb concentration led to stronger second-order Jahn-Teller effects and a larger B-site off-center displacement along BO6 chains, resulting in a more stable antiferroelectric state and a higher phase transition temperature. The anisotropy of the titanite-type structure results in a trade-off relationship between stabilizing the antiferroelectric state and observing clear antiferroelectric double-hysteresis loops in polarization-electric field curves. These findings suggest future directions for controlling the titanite-type antiferroelectricity beyond the current B-site substitution strategy.
Related Concept Videos
Solid–Solid Solutions
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Phase Diagram
Phase Diagrams
Phase Diagrams of Ternary Systems
Recrystallization: Solid–Solution Equilibria

