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Published on: November 27, 2015
Silver niobium trioxide, AgNbO3
1Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10, 162 53 Praha 6, Czech Republic. fabry@fzu.cz.
Summary
This study determined the room-temperature structure of silver niobium trioxide (AgNbO(3)) as a tilted perovskite, similar to sodium niobate (NaNbO(3)). No deviation from centrosymmetry was observed, despite prior indications of ferroelectricity.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Silver niobate (AgNbO(3)) is a perovskite material with potential ferroelectric properties.
- Previous studies suggested ferroelectricity in AgNbO(3) below 350 K, contrasting with isostructural NaNbO(3).
Purpose of the Study:
- To determine the crystal structure of AgNbO(3) at room temperature (291 K).
- To clarify the structural relationship between AgNbO(3) and NaNbO(3).
- To investigate the presence of centrosymmetry deviation in AgNbO(3).
Main Methods:
- Single-crystal X-ray diffraction on a twinned crystal.
- Structure refinement using the Pbcm space group.
Main Results:
- AgNbO(3) at 291 K adopts a tilted perovskite structure, isostructural with room-temperature NaNbO(3).
- The crystal structure was refined in the centrosymmetric Pbcm space group.
- No structural deviation from centrosymmetry was detected in this study.
Conclusions:
- The room-temperature phase of AgNbO(3) is a tilted perovskite.
- This finding contrasts with previous reports suggesting ferroelectricity in AgNbO(3).
- Further investigation may be needed to reconcile structural and ferroelectric properties.
