安定したデルタ-Bi2O3の酸化イオン伝導性を強化した
Rita Punn1, Antonio M Feteira, Derek C Sinclair
1School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, UK.
Journal of the American Chemical Society
|November 30, 2006
まとめ
ランタニドイオンを持つ新しいレニウム置換ビスムート酸化物 (Bi2O3) 材料は,高酸化イオン伝導性を示しています. これらの新しいデルタ-Bi2O3相は,高度な電気化学アプリケーションの可能性を秘めています.
科学分野:
- 固体化学 固体化学
- マテリアルサイエンス 材料科学
- 電気化学 電気化学について
背景:
- ビスマウト酸化物 (Bi2O3) は,固体酸化物燃料電池におけるその可能性で知られている.
- 低温で高伝導性デルタ-Bi2O3相を安定化することは依然として課題です.
研究 の 目的:
- デルタ-Bi2O3構造の安定化を調査する.
- 新しい置換相の酸化イオン伝導性を探求する.
主な方法:
- レニウムとランタニドで置換されたBi2O3.3の固体合成
- X線微分法を用いた構造的特徴化.
- イオン伝導性を測定するための電気化学阻力スペクトロスコーピー.
主要な成果:
- Bi12.5La1.5ReO24.5.5.のような組成を持つ新しいデルタ-Bi2O3相を成功裏に合成しました.
- 異常に高い酸化イオン伝導率 (約. 10−3 S cm−1 300°C) となる.
- インタースティシャルアニオン部位における理想的なフッ素酸塩の位置から有意な構造的偏差を特定した.
結論:
- レーニウムとランタニドの共同置換は,デルタ-Bi2O3相を効果的に安定させます.
- これらの新材料は,低温下でも有望なイオン伝導性を示しています.
- ユニークな構造的特徴は,強化されたイオン輸送特性に関連しています.
関連する概念動画
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:14Diamagnetic Shielding of Nuclei: Local Diamagnetic Current
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
01:19Ionic Strength: Effects on Chemical Equilibria
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary cation—the calcium...
In this solution, the primary cation—the calcium...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...