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Systematic charge distribution changes in Bi- and Pb-3d transition metal perovskites
Masaki Azuma1, Yuki Sakai, Takumi Nishikubo
1Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8503 Japan. mazuma@msl.titech.ac.jp.
Researchers studied charge distribution in bismuth and lead perovskite oxides. Temperature changes in bismuth nickelate (BiNiO3) cause charge transfer, leading to negative thermal expansion.
Area of Science:
- Materials Science
- Solid State Chemistry
- Condensed Matter Physics
Background:
- Perovskite oxides exhibit diverse electronic and structural properties.
- Understanding charge distribution is crucial for tuning material functionalities.
- Bismuth (Bi) and lead (Pb) based perovskites are of interest for their unique characteristics.
Purpose of the Study:
- To investigate charge distribution changes in Bi- and Pb-3d transition metal perovskite oxides.
- To elucidate the mechanism behind intermetallic charge transfer.
- To explore the relationship between charge transfer and negative thermal expansion in BiNiO3.
Main Methods:
- Comprehensive precise structural analysis.
- Spectroscopic investigations.
- Theoretical calculations and simulations.
Main Results:
- Observed changes in charge distribution within the Bi- and Pb-3d transition metal perovskite structures.
- Identified a correlation between the d-level depth of transition metals and intermetallic charge transfer.
- Demonstrated a temperature-induced charge-transfer transition in chemically modified bismuth nickelate (BiNiO3).
Conclusions:
- The study clarifies the role of charge distribution in the properties of Bi- and Pb-based perovskites.
- Intermetallic charge transfer is driven by changes in transition metal d-level depths.
- The observed charge-transfer transition in BiNiO3 is linked to technologically significant negative thermal expansion.
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